NIKKOR Lens Nikon 70-300mm f/4-5.6G Auto Focus Nikkor SLR Camera Lens

NIKKOR Lens Nikon 70-300mm f/4-5.6G Auto Focus Nikkor SLR Camera Lens

NIKKOR Lens Nikon 70-300mm f/4-5.6G Auto Focus Nikkor SLR Camera Lens
First off, let me tell you that this lens only works fully with the latest Nikon SLRs because it has no aperture ring to set f/stops. You must do that electronically using a D100, D2H, D70, N80, N75, F5 or F100. However, Nikon does provide a nice compatibility chart telling you how to use this lens on older Nikon cameras. So you can use this lens on S and P modes with the N90s, N8008s, N 6000, and N4004. This backward compatibility of lenses and bodies is one of the strongest points of the Nikon system. Even a 24 year old lens can be used with a new Digital SLR, to some extent.
NIKKOR Lens Nikon 70-300mm f/4-5.6G Auto Focus Nikkor SLR Camera Lens

Nikon 70-300mm f/4-5.6G AF Nikkor SLR Camera Lens NIKKOR Lens

Nikon 70-300mm f/4-5.6G AF Nikkor SLR Camera Lens NIKKOR Lens

Nikon 70-300mm f/4-5.6G AF Nikkor SLR Camera Lens NIKKOR Lens

• Nikon 70-300mm f/4-5.6G AF Nikkor SLR Camera Lens
• Accepts 62mm filters
• Count on genuine Nikon optics for outstanding picture quality
• Compact and lightweight, this 4.3x autofocus zoom lens is ideal for candid shots, portraits, travel and sports photography
• This is a G designated lens, not ED series. It is fully compatible with the F5, F100, N80, N65, N60, N50, N4004-series, PRONEA 6i, PRONEA S, D100 and D-series cameras, but not compatible with other Nikon cameras. For the F4, N90-series, N70, N8008-series and N6006 cameras, only programmed auto or shutter-priority auto exposure mode can be used. AF is not supported by D40,D40X, D60, D3000 & D5000 cameras.

- First off, let me tell you that this lens only works fully with the latest Nikon SLRs because it has no aperture ring to set f/stops. You must do that electronically using a D100, D2H, D70, N80, N75, F5 or F100. However, Nikon does provide a nice compatibility chart telling you how to use this lens on older Nikon cameras. So you can use this lens on S and P modes with the N90s, N8008s, N 6000, and N4004. This backward compatibility of lenses and bodies is one of the strongest points of the Nikon system. Even a 24 year old lens can be used with a new Digital SLR, to some extent.

 

 

NIKKOR Lens Nikon 70-300mm f/4-5.6G AF Nikkor SLR Camera Lens

 

Nikon 70-300mm f/4-5.6G AF Nikkor SLR Camera Lens NIKKOR Lens

Understanding Photography

In almost every industry there is a need to capture records and moMents. Are you interested in taking better pictures or becoming a serious Ph Meters and will help in your choice of lens in the future. Longer focal lengths allow greater magnifications. If you want to takea picture of an object that is 40 feet away then you will need a large focal length. 50 mm lenses see things normally and can be considered the view from your eyes. If the focal length is above 50 mm it is known as a telePh Meter of the aperture is called an F stop. This has an impact on how much light reaches your negative. If you are dealing with digital then you won't have a negative, but the same rules apply here. F stops range from 1.4 -22 and vary on cameras. The cameras that offer the highest ranges offer more flexibility and options. These are usually pro models. Lower numbers have wider apertures and produces more light.

Understanding Photography

Understanding Photography

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Understanding Photography

Understanding Photography

Shutter speedsare the length of the exposure or how long the shutter stays open. Once again this is a very important part of how light will be recorded. Shorter shutter speeds are needed for photos taken in bright sunlight, while longer shutter speeds are needed for night photos. Shutter speeds usually can be kept at around 1/250 of a second and will need to be adjusted accordingly. When deciding to take night photos you will need a tripod. Tripods are made in different sizes and vary in quality. A very sturdy tripod will be needed that can support your camera.

The resolution is digital cameras is measured in pixels. Although not found on film cameras, there is no need to worry because the image quality will be the same or greater. Digital cameras can be found with at least 12 megapixelstoday, but pixels that high would be on Pro models. Never buy a camera based on its pixel count, because that isn't the deciding factor on the quality. Quality is determined by lens, sensor size, pixel count and quality of the room itself.

Understanding these basic fundaMentals will allow you to make better choices when taking photos in the future. When in doubt simply turn on your camera and take many pictures. Practice may not make perfect, but in photography the time you put into it will show. Just remember that when there isn't enough light adjust your room, which is the rule of thumb.

Understanding Photography

How to Improve Eyesight-How to Throw Your Glasses Away Forever

It's unfortunate that people today are looking at more invasive measures to improve eyesight. Not only are they risky but also highly expensive with no guarantee that your vision will be restored permanently. If you are contemplating surgery or simply want to learn how to improve eyesight naturally then this article is for you.

How to Improve Eyesight-How to Throw Your Glasses Away Forever

How to Improve Eyesight-How to Throw Your Glasses Away Forever

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How to Improve Eyesight-How to Throw Your Glasses Away Forever

How to Improve Eyesight-How to Throw Your Glasses Away Forever

Our eyes are like any muscle in the body but it's very easy to forget that when reaching for your glasses or contact lenses. If you are anything like me the first things I used to do is reach for my glasses before I was out of bed. Having them permanently glued to me lead me to contact lenses which only created more problems and health issues such as severe redness, irritation and lack of oxygen to my eyes.

When you understandthat your eyes are like any other muscle in your body you can safely assume that you can not only strengthen them but restore your vision in the process.

Our daily lives wreak havoc on the health of our eyes and it's the number one cause for many of vision problems that have become prevalent in modern society. Due to the prolonged use on Computers and long hours in front of the television, our eyes are becoming increasingly lazy.

The first thing people do is run to the optometrist only to be told that they require corrective lenses. This is not the only choice. There is a good reason why they don't want you to know how to improve eyesight without shelling our to fortune in stylish glasses and contacts. They make a very healthy living selling you a "patch up" for yoursymptoms.

The prolonged use of corrective lenses simply makes your eyes lazier, the last thing you want when wanting to know how to improve eyesight permanently! This is why more often then not you will be told it's time for stronger lenses next time your in for your regular eye tests. Glasses do not rebuild your vision, they simply allow you to get by.

One of the best ways to improve your eyesight is to begin to allow your eyes to relax. One popular technique that works wonders is Palming. Palming is where you warm up your hands and cover your eyes for several minutes every day. Do not allow any light to come throw your hands as your eyes are covered. If you are finding it difficult simply imagine a happy memory. Repeat this every day.

Another way toimprove your eyesight is to take regular breaks every hour or so off your Computer away from the television to allow your eyes to relax and readjust. Our eyes are not made to look at a fixed point for an extended period of time such as focusing on a Computer monitor. Let your eyes zip around and look around you as they are naturally suppose to do. You can also begin to try and focus on things in the distance that your cant see without your glasses without straining forcing your eyes to become stronger and reduce laziness.

There are countless specialists that provide an alternative solution to learn how to improve eyesight naturally and throw away your glasses forever. One of the pioneers in this moveMent was Dr William h. Bates. In 1880, Dr. Bates conducted a series of tests onthousands of patients using techniques to not only improve eyesight but in many cases restore 20/20 vision. This lead him to be shunned by his peers at the time by going against the status quo.

The Bates Method has been used in many classrooms world wide teaching students how to keep their vision in great shape by performing these techniques daily. Almost all common vision problems such as being short sighted or far sighted can be cured overtime using these techniques.

How to Improve Eyesight-How to Throw Your Glasses Away Forever

5 Common Eyesight Problems, Its Symptoms and Treatments

Some people are experiencing some problems in their eyesight that can be a hindrance in their performance of various activities. Some of the common eyesight problems including myopia, hyperopia, astigmatism and night vision problems. These problems are evident of wide array of symptoms and a lot of treatMents are available to resolve the problem.

5 Common Eyesight Problems, Its Symptoms and Treatments

5 Common Eyesight Problems, Its Symptoms and Treatments

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5 Common Eyesight Problems, Its Symptoms and Treatments

5 Common Eyesight Problems, Its Symptoms and Treatments

Common Eyesight Problems

There is a wide array of vision and eyesight problems that can be a hindrance to the performance of a person in his or her different activities. Weak eyesight is a common problem nowadays. Knowing the symptoms of eyesight problems is of vital importance to do necessary actions while it is still early. Here are some of the common eyesight problems that people commonlysuffer with as well as the symptoms and treatMent for the eyesight and vision problems:

1. Myopia (near-sightedness)

One of the common eyesight problems nowadays is myopia or the near-sightedness. In this eyesight problem, you can only see things that are near clearly. This happens because of the shape of our elongated eyeball that causes light to be concentrated directly on our retina rather than just on the surface.

·        Symptoms:People who have myopia often have headaches due to the strain they get when trying to focus on far objects.

·        TreatMent:The most common treatMent to this problem is wearing eyeglasses and contact lenses and lasiksurgery.

2. Hyperopia (farsightedness)

If in myopia we can only see clearly those objects which is near to us, hyperopia or farsightedness we can only see far objects clearly. Due to this problem, they get strain very hard when trying to see objects that are within their proximity. In this case, a person with hyperopia has a shorter eyeball making the light to fall behind the retina rather than the surface.

·        Symptoms:A person may experience blurred vision and difficulty in seeing objects in short distances.

·        Treatment:This condition is commonly treated by using corrective lenses. Refractive surgery can also be applied in treating hyperopia.

3.Astigmatism

In astigmatism, those who have this problem have blurred vision at all distances and headaches. This is because the shape of the eyeball which is more oblong than spherical causes two light points instead of just one to focus on the retina.

·        Symptoms:People with Astigmatism may experience distorted vision at all distances, headache and fatigue as well as some irritation and discomfort in the eye.

·        Treatments:Wearing special contact lenses and eyeglasses and also refractive surgery are the treatments to this problem.

4. Presbyopia

This is another common eyesight disorder that usually occurs because of old age or aging. The eyes lose its abilityto focus on objects and things at a distance causing a blurred vision. Presbyopia commonly occurs to the people who are at the age of forty or above.

·        Symptoms:People suffering of Presbyopia often have a blurred vision of objects near to them.

·        Treatments:Presbyopia is commonly treated by wearing eyeglasses and contact lenses that can correct the vision.

5. Poor night vision

Poor night vision is common eyesight problem. It may be an early sign of progressive cataracts. Night vision problems or the worst case, the night blindness, may be treatable or could be a sign of a congenital problem such as retinitis pigmentosa or other more serious conditions. It may also beresult of vitamin A and zinc deficiency. Other causes are diabetes and too much sunlight exposure.

·        Symptoms:A person with a poor night vision or night blindness has difficulty seeing at night and it takes so much longer for the eyes to adjust in the dark.

·        Treatment:Night blindness can be treated by adding Vitamin A and Zinc in your diet.

Our eyes are plays a very important role in our daily activities. We are at risk of different eyesight problems that can occur because of different circumstances and at various sTAGes in life. Knowing the different eyesight problems will help us in preventing its occurrence.

5 Common Eyesight Problems, Its Symptoms and Treatments

Which Contact Lens Brands Are Most Popular?

Contact lenses are definitely a great alternative to dealing with glasses on a daily basis and many people feel they are worth the extra expense. They tend to be more comfortable and if looked after properly, seldom causes any issues. But for anyone who is still in the planning sTAGes of getting contact lenses, knowing what the most popular brands are can be a very good way to go.

Which Contact Lens Brands Are Most Popular?

Which Contact Lens Brands Are Most Popular?

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Which Contact Lens Brands Are Most Popular?

Which Contact Lens Brands Are Most Popular?

Acuvue

These are possibly THE most popular contact lens brand name, thanks to extensive advertising campaigns and high quality lenses that keep people talking about them. They are produced by the parent company of Johnson and Johnson and are part of the world's top contact lens line. These contact lenses are available world-wide,too.

Biomedics

Another very popular contact lens brad, Biomedics prides itself on offering 1-2 week disposable contact lenses. These are top quality soft lenses that conform to the eye and can be left on continuously for 7-14 days. There's no cleaning involved, you just toss them at the end of the two weeks and open another pAir.

Focus

Focus brands contact lenses are another extremely well-known brand that has widespread advertising campaigns and quality products. They provide a wide range of different contact lens options, from daily wear to completely disposable contact lenses and everything in between. Focus offers a full range of eye care solutions.

Frequency

These contacts are created with theuser in mind and they have a range of types including multifocal and aspheric among others. These are contact lenses that can be used for longer periods of time, just 4 boxes will Supply you for an enTire year and 8 boxes keep you in contact lenses for the next two years.

Fresh Look

Just like the name suggests, Fresh Look contacts offer a brand new look for your eyes. From subtle color differences to bright and bold ones, these contact lenses give you the chance to see what it would be like to see the world through blue eyes when you've got brown and vice versa. For anyone who wants to try a new eye color (or two or three) Fresh Look is the most popular brand.

O2 Optix

For those who have astigmatism or another similar issue, O2 Optix offersa solution with contact lenses. They tend to be fAirly focused, but provide an excellent solution for this type of eye problem. Again, a very popular brand.

ProClear

These come in a variety of types, including 90-day wear and toric contacts. However, they are best known for their comfort level. Even contact lens wearers who find they have quite a bit of irritation with regular lenses will be thrilled to discover that ProClear lenses are softer and more comfortable than other brands. The reason for this is the special technology that allows the lenses to function similar to your eyes by surrounding cells with liquid so they stay nice and moist, even after extended wear.

PureVision

This brand is usually associated withmultifocal contact lenses that permit you to deal with differing eye problems at the same time, with the same pair of contact lenses. This can be very useful for anyone who suffers collarbo from more than one condition.

By going with a popular brand of contact lens, you are bound to find one that works well. Thousands of people aren't using these brands because they are lousy and don't work, after all. So take a good look at the most popular options in contact lenses and try them out for yourself. You might be pleasantly surprised to find luxury in your contacts.

Which Contact Lens Brands Are Most Popular?

CCTV Camera-Do-it-yourself Installation Guide

Introduction:

CCTV Camera-Do-it-yourself Installation Guide

CCTV Camera-Do-it-yourself Installation Guide

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CCTV Camera-Do-it-yourself Installation Guide

CCTV Camera-Do-it-yourself Installation Guide

This guide is written for those who do need video security and can't afford costly installation services, or if the CCTV installer is not available in your area-the later is more common than one could think. We will cover most common security equipMent types, as it is virtually impossible to go over such a wide rang of different security cameras and recording/video processing equipMent available on the market.

I assume anyone considering do-it-yourself CCTV installation has basic knowledge of wiring techniques and practices. I am not to be held responsible or liable for damages to the equipMent due to mishandling or misuse. Remember; during the installation always pay attention to safety. Working at heights and using tools can be dangerous,please follow all safety practices. Lets jump right to it now.

Planning: First step of any room installation is to plan the room and monitoring equipment locations. When planning for camera locations please take into consideration light condition, never install cameras in low light room pointing straight into the sunny area it will add glare to the picture, even if your camera has back light compensation it will not be enough. Use infrared cameras for very dark conditions and/or b/w cameras with LUX number as low as possible. I am not going to discuss proper equipment selection, as this was subject of my last article.

Selecting the best possible room locations is not easy, and will directly impact the camera views. Besides light conditions, the distance to the monitoringobject is equally important. There are many different types and focal lengths of lenses; your selection will depend on light condition and distance from the camera to the monitoring object. In small rooms around 500sq. ft. cameras with standard 3.6 mm lens should be OK. Keep in mind that most type of bullet and board cameras come with 3.6 mm lens, the greater the distance to the monitoring object the longer focal length of the lens will be needed. There is no way of judging ease lens selection, you can guess or buy professional eider lens selector tool ... Alternatively you can start with your lens selection and if needed get longer or shorter focal length lens later. Other option as far as lens selection goes, is to usevariable focus lens, which is very versatile approach and takes the guess out of the lens selection process. For those who do not know what variable focus lens is, it's basically adjustable focal length lens that will allow to change the focal length within specified range, fore example: 2.6 mm-8 mm or 5 mm-50 mm.

To maximize cameras coverage and get the most out of the CCTV system for least amount of money minimize number of it by placing cameras in strategic places, unless complete area coverage is needed. Avoid overlapping room views, do not install them with source of light directly in front of it and do not place infrared cameras pointing at each other to eliminate risk of overexposure. These are the most common mistakes that need to beavoided. After the initial room locations are predetermined, lets look at cable placement. Make sure that it is actually possible and practical to run cable to each location, if running the cable to any room location is for some reason impossible opt-out for alternate location.

Wiring: The most time consuming and important part of any room installation is wiring. Plan your installation carefully to minimize cable lengths and insure good quality video signal. Never run cables alongside high power electrical lines, at least 12 "spacing between video cable and power lines are recommended. Keep the cable lengths below 400ft and use good quality cable, most people take the cable for granted, but it is actually very important aspect of any installation. The CCTV system is only asgood as its weakest component. I usually stick with RG59U with Coleman power cable (YES it is US made) sometimes called Siamese type cable. It is combo cable and will transmit video and power, as an alternative it is sometimes possible to use less expensive standard RG6 coax cable with separate run of 18/2AWG for power.

The Siamese cable is less bulky and easer to run, distribution power Supply is recommended with this type of cable as power will be supplied from common place right next to monitors and recording equipment. Using Siamese cable makes for more clean and neat installation, as only one line is required for each room. RG6 cable with separate Running run for power is the likely solution if power outlets are available near each locations. In this case individual Plug-inspower Supplies are used to power them with power cable running as separate and independent line to the room. Both types of cables are available at dvrexperts. When running the cable it is good practice to leave couple of loops of extra cable at both room and monitoring locations. This extra length of cable is needed if in the future monitoring or location will have to be moved slightly. After the cable is in place, the labor-intensive part of installation is over, now we can get to the fun part of installation.

Camera mounting: Most s come with mounting screws and bracket included, attach the bracket firmly and remember that in some cases different brackets than the ones supplied with the cameras could be needed.

Attach the camera to the bracket and adjust the positionapproximately at this time, we will come back to it later. Typical security camera is powered by 12VDC or 24VAC and power input type is screw or push terminals or 2.1 mm Plug. Power connection will differ for each type of power Supply and input style. Most cameras are 12VDC, in this case it is important to observe polarity or you may damage the camera. The power cable has two conductors and in most cases it will be red or white and black cable. Use the red or white for positive and black for negative terminals. If it has screw or push terminals connect the input power cable directly observing polarity, if it is 2.1 mm plug, a special DC Plug 2.1 MM Female with Flying Leads have to be connected to the cable again keep attention to polarity. The 24VAC connection is very similar, with one majordifference-polarity is not important.

The Next step will involve some special tools and accessories. We will attempt to go over the installation process of crimp-on BNC video connector, I will post video demonstration of BNC crimping techniques shortly so please check the web sites mentioned in this article often.

Steps:
1. Remove about 1/2-inch long outer jacket from the end of the video cable exposing braid.
2. Slide the barrel onto the cable crimping with the larger diaMeter facing end of the cable.
3. Pull the braid backwards exposing the inner material and remove isolator 3/8-inch of it so you have now core conductor exposed.
4. The main part of BNC connector has a small hole on one side; push the exposed core conductor of the cable into that hole as far as itwill go.
5. Push all the braid folded backwards in step 3 onto the BNC connector and spread the braid evenly around connector.
6. Push the barrel onto the crimping BNC connector all the way.
7. Using crimping tool, squeeze the crimping barrel onto the BNC connector, now the cable braid is compressed in between barrel and BNC connector crimping how re-assuring secure connection.

BNC connector is on, lets hook it up now and repeat the steps for each camera, if you have purchased 16 camera system you may want to get some coffee first.

Monitor and recorder connection:

Cameras are on, its time to make final connections. I will focused on standard CCTV DVR recorder, monitor and distribution standalone power supply, as this is the most popular and likely solution formost CCTV installations.

First we have to install BNC connectors on this side as well-its time for that coffee again. It is good idea to make room for monitor and recorder now and setup some type of desk, shelf or rack to place all the equipment on.

We need the monitor and recorder in place so we can determine proper power supply location. Power supply should be mounted within couple of feet from the DVR video inputs. After power supply is secured separated the power conductors from the Siamese cable, and run it to power supply. Like we did with the cameras if 12VDC power is used, we need to Watch the polarity, each terminal on the power supply is marked, so there should not be any doubt. Make sure the power supply is not plugged in to the power outlet yet.

Connectvideo cables to the DVR video in ports. We need one video cable to connect the DVR with the monitor, if you do not have one you may cut piece of Siamese cable separated the power conductors from it and install BNC connectors on both ends, you now have the cable. Connect the DVR monitor out port to monitor video. We are almost ready to power up everything; there is only one more thing to take care before we do that.

We need to protect the equipment from power spikes by plugging it into power conditioner or better yet, buttery backup unit. If the installation location is experiencing frequent power ouTAGes, the backup unit is strongly recommended. To extend the backup time only plug the DVR and camera power supply to the monitor unit and the backup to regular power strip, this wayif we do loose power for some time the DVR and cameras are still functioning as normal while the monitor is off. Turning off monitor will not affect DVR and cameras in any way; it is actually good habit to turn the monitor of if not used to extend its life.

Power on and final adjustment: Yes ... we are now ready to power it up for the first time, if this is your first installation it may be nerve-racking experience. Start with turning the cameras power supply on, turn the monitor on as well followed by DVR system. The stand-alone DVR, after self-test will show cameras or setup menu on first power up depending on your model.

To setup the DVR refer to the manual for proper settings. Go over each room view to determine if the view is actually what you want, it will hardly ever bewithout additional readjustments. To properly and easily adjust the positions, the test monitor will be very handy if not essential tool. Go to each room and connect the test monitor to adjust the position to your preferences, if satisfied secure camera bracket adjustment screws-we will not go back to this room anymore.

Conclusion: Congratulations! You have just completed your most likely, very first installation of CCTV system. Visit our store fore more information on surveillance cameras, DVR recorders, tools and accessories.

CCTV Camera-Do-it-yourself Installation Guide