• Originally Posted by 10speeduk
Thanks for the responses guys. I would prefer to view the ground glass. I shoot this shot indoor with window light with Iso 400 film at 1/60 with a 110mm lens at f2.8

What would be the equivalent dof, lens and shutter speed to make this shot with a LF camera?

Just approximately?

You can figure this out from the ratio of the film sizes, which is easy in this case because 6x7 (55x69mm) is basically the same aspect ratio as 4x5 film (95x115mm), and the ratio of the two sizes is about 115/69=1.66. If you're familiar with 6x7 and want to think about 4x5 options, keep that 1.66 number in mind for all your conversions.

To get the same field of view, you need 110*1.66 = 180mm lens. And for the same DOF, f/(2.8*1.66) = f/4.5. And because of the smaller relative aperture, you need 1.66^2 = 2.8x (about 1.5 stops) more illumination, exposure time or sensitivity.

f/4.5 lenses are not real common on 4x5 but they do exist, e.g. Xenars. Most people just cheap out and buy modern f/5.6 lenses and ignore that last half-stop - you won't be able to shoot in as low light as you can with the RZ; you will need 2 stops more light (f/5.6 vs f/2.8) than the RZ does. That's the tradeoff with bigger film.

If you go to 8x10 that's a doubling, so it's 2 more stops of light required over what 4x5 needs.