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Questions about a specific problem or issue, often dealing with a lens, camera body, image sensor, lighting equipment, or software specific to photography.

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6
votes
5answers
2k views

Why is my Nikon 18-200 lens not focusing at higher focal lengths?

My Nikon 18-200 lens on a D300 camera will not focus when it is zoomed between 135mm and 200mm. Is there any tips on how to solve this besides handing it in to a photo store?
11
votes
1answer
865 views

How can you tell if a lens is having problems with back focusing?

I recently bought a Canon EF 24-70/2.8L to use with my 450D and I suspect that it is constantly back focusing. Is there any way of determining if it is something wrong with the lens or if it is a ...