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| p.88 #6 · What is your most recent (alt) lens purchase? |
Great job sebboh! Very neat!
This is very interesting for me. I instantly have some questions...
Did you manufacture that ring yourself, that centers the lens at the front (the flat one with the two holes)?
How would you approach to transfer the aperture values? By measuring the light with a camera meter, or by holding the G45 aperture ring side by side to the Rokkor aperture ring and making the marks?
Thanks for your insight!
actually that ring (which has four not two holes) is what centers the optics on the original g 45. it just happens to fit perfectly within the front optical block of the rokkor (with the optics removed obviously). incidentally, if i remove that front optical block module, the front of the g 45 that contains filter rings and name plate fits in perfectly. unfortunately that piece is to long to get clamped in place by the rokkor name plate, so i will have to trim it down in both the front and the back in order to use it.
both the rokkor and the contax have aperture rings that travel a consistant distance between each stop. i'm going to calculate the angular distance each travels from f/2 to f/16 and try to arrange a lever system that will correctly multiply the angular distance traveled by the appropriate constant. this is actually how the original rokkor aperture control worked, so there are lots of pieces from it i can hopefully reuse.
Ah, I spotted a mistake here: this is correctly called "the right direction"
blasphemy! how could leica, zeiss, and minolta (canon and olympus too) all get this wrong? i think even nikon used to have it right on their rangefinders and just switched on their slrs to make people disinclined to switch away from their system.