JimBuchanan Offline Upload & Sell: Off
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DavidBM wrote:
I seem to recall that Canon said you should always use a 'normal' drop in.
I wonder if that means the lens is calculated to include that filter? @Matt Grum@ @Phillip Reeve@ does your copy have a glass drop in filter?
I also read that the one Canon supplied was single coated, but that you can rep,ace it with a modern MC version if you want to include the glass in the path with less contrast loss. But presumably has to be the same thickness as the original...
The "normal" 1X filter does extend the image back toward the camera, but because of the variable infinity focus stop it makes no practical difference. But, yes, I believe the focal length and lens register was calculated assuming the presence of the normal 1X filter. When I would modify the focusing of the FD300/2.8 to reach infinity with Ed Mika's FD-EF mount changer on Cannon bodies, It was important that the normal 1X was in place.
I use the rotating polarizing filter full time in my FD300. I will say that it gives a very mild polarizing effect and I've often wondered if something was wrong with it, but the IQ of the lens is always excellent.
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