center filter from fuji g617 on apo grandagon55

[giancatarina]

I definitly need a center filter when shooting 4x5 slides with my apo grandagon 55, i just wonder if i can use the center filter for the fuji g617 (thread77) on my rodenstock lens(thread67) using stepping rings (67to72 and 72to77) ?

[Bob Salomon]

No. Only one with 67mm thread that does not use a step-up ring to mount it will work properly. Among other problems the distace from the lens to the filter will be wrong as will the size of the spot.

[Ellis Vener]

Bob is right about the physics involved.

Try a Heliopan center weighted filter instead of the Rodenstock branded one. When I needed a CWF for my 90mm f/4.5 Grandagon I bought the 82mm Heliopan CWF from Ken Hansen Photographic in New York City and it was , as I recall, only slightly more than half the price of a Rodenstock from Calumet Photographic. As far as I know Ken Hansen's shop is <I>not</I. a 'gray market' vendor; as their priceand Calumet's price were virtually the same price was just the same for the Heliopan CWF