Tele lenses for GXR M mount module

Started Apr 4, 2012 | Discussions thread
Tom Caldwell Forum Pro • Posts: 30,975
Re: Elmarit-M 90mm and GXR M mount

zigorus wrote:

2x teleconverter cuts light by two stops, one quarter the prime objective's speed.


Thanks for that, the only experience I had was the advice I noted on Canon teleconvertors were the effective aperture was divided by the multlication of the adapter whether 1.4x or 2.0x the example was that a 2.0x made a f2.8 lens a f5.6 lens. Which is much the same thing, but I think I may have mis-read and I appreciate your comment.

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Tom Caldwell

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