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อ้างอิง

อ้างอิงโพส 3 ต้นฉบับโพสโดย dogsunshine เมื่อ 2012-02-20 00:01  :
สนใจโทรถามได้คับ สภาพเลนส์สวยมากเลยแนะนำ @pao  อะแดปเตอร์หาได้ทั่วไปคับ

อ้างอิง

It is basic. The distance from the back of the lens to the film plane is different for Canon FD and Canon EF (EOS). To make an FD lens fit on an EOS body and maintain infinity focus, the adapter would have to sink the lens physically into the camera body. Clearly, it cannot do that, the mirror would be hitting the back of the lens.

So there are only two solutions.

The first is to use an inexpensive adapter which has no glass element in it. This will not allow infinity focus, but it will allow macro. The FD glass remains as good as it ever was, which is quite good indeed.

The second is to use a more expensive adapter that has a glass element in it that applies a small negative correction. Like putting on a pair of glasses to correct far-sightedness. This allows infinity focus.

However, now you have a piece of glass between the famous FD glass and the image sensor. Will it degrade the resulting image? Well, it is a sure bet that it won't make it BETTER. And since it is an additional piece of glass, it probably will have SOME effect. So the chances are fairly good that it will degrade the image to some extent.

The $64,000 question is - how much will it degrade the image? Will the results be acceptable? The answer is - it depends on the lens, the image itself, the conditions it was taken under, and what YOUR criteria of acceptability happens to be.

Speaking only for myself, I would not bother putting FD glass on a Canon EF-mount camera. I would rather get an adapter for some other high-quality glass that does not require an additional glass element, like M42 or Nikon or something. All fine choices. FD is about the worst choice you can make for adapting to your EOS body, as strange at that sounds from a Canon fan, which I am.

Use FD glass for FD bodies and be happy. Use other brands on your Canon EOS bodies and be just as happy. That's my advice.

And just FYI, the image of the 'FD" lens on the EOS camera above is not an FD lens, it is an FL lens and it is not an SSC coated lens, either. It also appears to be an f/1.2 which is a fine lens, just not an FD lens. Just saying.