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Takahashi 645 0.72x reducer
Hi folks
for those of you who might own this reducer, perhaps you can clarify something for me.
My google reading yields 2 backfocus distances for this reducer. One is 73.5mm and the other 56.2mm
I have found a diagram that clearly shows how both are calculated….the 73.5mm is from the actual lens element to the focal plane and the 56.2mm from the physical end of the reducer….the so called metal back distance.
The fact that you cannot attach anything to the reducer on the camera side, would suggest that when working out your optical line up, you should use the 73.5mm as the ‘working distance’.
Agree?
thanks
Martin
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