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Columbia Heights, US
73 posts

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BJL Basic Member
Tue 10-Jul-01 10:48 PM

I have been using various ED80-200 Nikkors for the last few years. Having previously owned and sold the AFS lens (another story), I am familiar with its design and use. This lens is an IF lens and the front element does not move at all. The net result is that the air gap between a filter and the primary element is constant. In contrast to the AFS lens, the 2-touch AFD (my current lens) is not an IF lens. Specifically, the primary element moves within a fixed tube that does not rotate. While this is convenient for polarizers, I have noticed that the front lens element is very far away from the filter if the lens is focused at infinity. The net result is a large air gap. Now, I am not a physicist, but I've got to believe that this air gap between filter and lens negatively influences the sharpness of the final image. Therefore, I never use a protection filter on this lens for fear of negatively impacting the final image.

What do you think? Is the AFD lens not well suited to filter use?