What size filter to use on caltar 150mm 6.3 lens

[Douglas P. Theall]

Hi again. I have the 4x5 Tachihara with the caltar 150 lens in a Copal 0 shutte r. Does anyone know for sure what size filter it accepts. The lens cap has 42 o n it so I was under the impression it was a 42mm filter size. But that is assumi ng and you know what that gets you most of the time. Thanks for your help again, Doug

[mitch rosen]

You can probably get this info from the calumet website. The filter size is most likely 40.5mm, especially if the lens is a caltar IIe (i.e., a rodenstock geronar).

[Douglas P. Theall]

You were right on the money with the 40.5. Thanks