Yeah... Pentax 67... I was out shooting the 300 EDIF lens the other day with it. Realistically, have to use the same big wooden Ries tripod that I also
use shooting 8x10. Or it can be shot even handheld resting atop a jacket on a car roof or fencepost, but only at high shutter speeds which finish
before the mirror slaps. Mirror lockup depends; it's more dicey than with shorter lenses, even with tons of tripod support (I bolt the lens directly to the tripod top, and don't use a tripod head at all!). But simply shooting at high speed without a tripod at all, just resting atop something, often works because my main intended use for this lens either involves distant subject or shallow depth of field shots like wildlife where a very wide aperture is appropriate. But that is a big heavy cannon barrel of a lens. By comparison, if I let the bellows do that extension on a 4x5 and use a 120 roll film back instead, I can employ a tiny little 300M Nikkor lens, along a serious but far lighter CF tripod, have full view camera movements for plane of focus etc, but obviously a slower working pace. Both methods are a lot of fun. But there is no way I'm going to lug a 300 P67 lens on a two week backpack trip! There are many scenarios where a true view camera gear kit, at least 4x5, comes out lighter than most MF SLR's equivalents.