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View Full Version : Is my 210mm Computar f9 convertible?



Dhuiting
16-Dec-2017, 18:37
Iíve seen versions of this lens that have a double aperture scale, where you remove the rear element and you effectively have a 370mm lens. Mine does not have the double aperture scale. Does that mean I cannot remove the rear element and get the same 370mm convertible as the ones with double aperture scale? And if so, whatís the difference?


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Whir-Click
16-Dec-2017, 19:22
All versions of the Computar/Kyvytar/Kowa Graphic 210 lens are convertible. With the front cell removed, the Computar becomes a 370mm f/18 lens. If your shutter does not have the factory original double aperture scale, you can simply double the existing aperture values when using the rear cell by itself, e.g. f/16 becomes f/32 when converted.

When I purchased a new old stock Graphic Kowa 210 in barrel and transfered it into a Copal 1, I paid SK Grimes to engrave the double aperture scale. When I saw that all the values were simply doubled, I felt a little foolish; I thought it would be a much more complicated endeavor.

Dhuiting
16-Dec-2017, 19:25
Awesome! Thanks so much!


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Whir-Click
16-Dec-2017, 19:27
It’s a great family of lenses. Enjoy!

Pfsor
17-Dec-2017, 05:17
I’ve seen versions of this lens that have a double aperture scale, where you remove the rear element and you effectively have a 370mm lens.


With the front cell removed, the Computar becomes a 370mm f/18 lens.


It's nice to see how perfectly you agree with each other... :)