Is my 210mm Computar f9 convertible?

[Dhuiting]

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. 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, what’s the difference?


Sent from my iPhone using Tapatalk

[Whir-Click]

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]

Awesome! Thanks so much!


Sent from my iPhone using Tapatalk

[Whir-Click]

It’s a great family of lenses. Enjoy!

[Pfsor]

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...