Camera Lenses And FiltersKeeping A Clear View Through Your Camera Lenses

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Xenon HID Lights Help to Achieve More Glare for Your Vehicle

Majority of car manufacturers have started to realize the popularity of Xenon HID lights and incorporated them as standard equipment in their high level cars. You’ll also have the option of installing these HID headlights on your mid-range cars. These products are also sold separately by a large number of offline and online stores. Owners of older cars are very curious to know about this lighting option and its viability as a source of illumination for their cars.

Xenon HID lights provide brighter illumination in comparison to halogen and are more energy and cost-efficient as well. But when it comes to glare, the federal requirements are similar for both. Some people raise the question why Xenon headlights look blue. The reason lies in the distribution of energy generated inside the bulb by a number of noble gases, certainly including Xenon, that are under tremendous pressure. The bulb contains a line spectrum in its output emission with some of its tops in the noticeable blue area. Hence, all the lights generated by these headlights are not blue, but they still appear to be blue in color.

Some manufactures attempt to replicate a Xenon HID bulb by coating or coloring a halogen bulb blue. But, the actual truth is a genuine Xenon HID system is not blue in color. You only observe a bluish color because of the resultant high voltage arc and the release of the Xenon gas inside the bulb. So, beware of counterfeited Xenon headlights in the market.

When you compare a halogen headlight with a Xenon headlight, you can clearly distinguish a number of factors. Firstly, you’ll get a glittering bluish white illumination through a Xenon light, whereas a halogen bulb emits yellowish light. Secondly, the Xenon system covers a wider area and generates more light than a halogen system. It is also very easy to identify Xenon HID systems as they have D2S, D2R, D1S, or D1R stamped on the external lens of their systems. The absence of any one of these combinations gives you a clear-cut idea that you don’t possess a true Xenon HID system.

If you want to verify whether these lights are legally approved or not, you can look for the letters “DOT†pointed on your Xenon HID system. In the USA, you can use only those headlights on public roads which are DOT approved.

About the Author

Choose your preferred Hid Kit from http://www.hidonlinestore.com/ to enhance the style quotient of your vehicle. You can even go for an illumination color to suit your personality and hit the road with great amount of confidence and safety.

help needed for my first slr camera?

I saw this camera on ebay…..

Here is a mini-tutorial I made myself to compare focal lengths. This is NOT a lens test or a camera test! It is merely intended to show the difference between various focal lengths. The lens was the Nikon 18-200 VR lens, which is (by definition) an 11X lens, but that 11X does not tell you what the final image will look like. The camera was a Nikon D200 so there is a 1.5X “crop factor,” “lens factor,” or “focal length multiplier.” There is further explanation on the image itself. It would help if you click on “All Sizes” above the image.

http://www.flickr.com/photos/7189769@N04/476181737/

Your first lens would cover the first four pictures (18 – 24 – 35 – 50) and then skip to the next four (70 – 135 – 200 – 300). Of course, you already know that the zoom from18-to-55 is continuously variable and it does not skip from 18 to 24, etc. There’s not a lot missing here, especially considering that you will have 10 MP to work with. We talk down about digital zoom all the time, but cropping and enlarging a little bit will easily allow you to bridge the gap from 55 to 70 when you edit your images.

I have dealt with Cameta a couple of times and found them to be very helpful. They WILL ask you if you want this or that extra thing, but I felt no pressure. They will probably suggest a UV filter or skylight filter for each lens and maybe an extra battery, so be sure that you are ready with comparable prices for these items. Their prices were fair when I bought from them. Also, since you actually finalize your deal on the telephone, you can add anything else you want. You MIGHT want to spring for the Nikon 70-300 VR lens, which is awesome. Its price is somewhat on the awesome side, though.

Here’s my stock answer on that topic:
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Image Stabilization – Vibration Reduction

This technology is known as “image stabilization,” “vibration reduction,” “shake reduction,” “optical stabilization,” and “anti-shake” by the various manufacturers. It is “for real” and makes a visible difference most of the time. If you are using an average point and shoot camera without a monstrous zoom lens, you will see the difference in lower light situations where the camera will be using about 1/60th of a second or lower. If you are using a telephoto lens, the effect will be noticeable at roughly anything slower than the inverse of the focal length, which used to be our standard for deciding when you should use a tripod. If it’s a 200 mm lens, you will see the benefit of “IS” or “VR” at speeds of 1/200 or slower. If it’s a 500 mm lens, you will see the benefit of “IS” or “VR” at speeds of 1/500 or slower. Actually, you will notice a difference at slower speeds than this, but I’d say that this threshold is where it can be called a distinct advantage. Macro shooting benefits from “IS/VR” also, because any movement will be greatly magnified when you are working at extreme close range with high magnification. Also, I feel that “IS/VR” helps if you are using a point and shoot camera at arm’s length as you compose in the LCD monitor. It is much harder to hold the camera still with your arms out in front of you. “VR/IS” would be helpful there, even with the shorter focal lengths.

Please understand that “VR” or “IS” (etc) will NOT stop motion in a moving subject. You need to use a high shutter speed and/or pan along with the subject in order to do that. VR is only to minimize the effects of camera movement to give you a better chance at getting a clear picture. It won’t work miracles there, either. You have to at least TRY to hold still. You can’t go down a bumpy road in speeding car and expect to get great shots.

This is a composite I made to demonstrate “vibration reduction,” which is also called “image stabilization” and “shake reduction” by various camera and lens manufacturers. For the best results, you should click on “All Sizes” and then “Original” before making your comparisons. I tried to remain consistent for all three shots, but I guess as clouds move in and out, things varied by an f-stop or so. I do not think that depth of field is an issue in this test, though. I did not move my feet at all during the test, so the point of view is identical. All three images were made using 1/60th of a second, which I consider to be the low shutter speed for hand-holding a 60 mm lens. I made a reference shot with my 60 mm Nikon macro lens, since I know this to be a fairly sharp lens. I tried to hold as still as I could, but I did not use a tripod. I then made two more exposures with the Nikon 18-200 VR lens, set at 62 mm. I was trying to match the 60 mm lens, but I did it by just remembering some landmarks and zooming to match. As I used the VR lens, however, I did my best to actually “vibrate” the camera by inducing a tremor in my hands as if I was shivering in the cold. I took one photo with the help of VR and one without. It was extremely odd to look through the lens as I shook my hands.

Since the VR was working, even though I knew I was shaking the camera, the image appeared steady in the viewfinder! Okay, compare the shots for yourself. You won’t see too much difference in the top two, but the effect of vibration reduction is very obvious when you see how the picture comes out when “VR” is turned off.

Nikon D200 – ISO 100 – Nikon 60 mm Macro and Nikon 18-200 VR with and without VR

http://www.flickr.com/photos/samfeinstein/511455669/

I realized that the first VR demo (above) may not be a “real world” demo, as I was TRYING to shake during the exposure. Who does that? I was originally trying to answer a question for someone who had a problem with severe tremors, so I was trying to induce tremors in my own hands. Well, I should ask, “Who does that on purpose?”

So in this pair, I was trying to hold still for both shots. The white balance is different, as I am trying to learn about that, but I realized that the first shot I took had the “VR” turned off. Everything else is the same, because I didn’t move and the shots were made less than 30 seconds apart. The exposures were the same for both shots. I did not do ANY post-processing at all, as that would defeat the purpose of the demo.

Nikon D200 – ISO 100 – Nikon 70-300 VR @ 240 mm with and without VR

http://www.flickr.com/photos/samfeinstein/755244335/

For a detailed, yet easy to understand explanation, see:

http://www.kenrockwell.com/tech/image-stabilization.htm

John Harrington – WHAT WE USE – Nikon D3 Kit:

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