Hi everyone,

I'm about to order a custom 8x10 pinhole camera. I'd like the focal length to match, as closely as possible, my 40mm lens on my Hasselblad. Ken Rockwell suggests that this lens on a Hasselblad is similar to a 35mm lens on a 35mm. Which seems not quite right to me. Another resoruce suggests:

Yep, www.hasselblad.se has data showing the 40mm FLE covers 89 degrees diagonal and 69 degrees horizontal.

When I look through tables of angle of view, I never know what number to use horizontal, vertical, diagonal, etc. I'll often have my Hasselblad with me, so I'll compose with it and then shoot with the 8x10 pinhole.

What might you suggest for a focal length on the 8x10?

Thanks!