Recession depth for 65mm lens?

[Tony-S]

Does anyone know how deep of a recession I need for a 65mm lens (Fujinon W) used with 4x5? My 90mm requires 15mm.

Thanks,

Tony

[ic-racer]

Search for the 'flange focal' distance for both lenses on the datasheets. Subtract the values. Add the result to 15 and you have your answer. For example the Fujinon 65mm SWDS has a Flange Focal Length of 73.4mm and the 90mm SWS is 98.7mm, etc.