Nikon PB-4 brand_Rollei quick way to get a

quick way to get a look at your slides

So keep it folded down

but it's relatively sturdy

though it's less of an absolute lock than a very strong suggestion

Nikon PB-4 brand_Rollei quick way to get aThe Nikon PB 4 is Nikon's most unique and versatile bellows, with front standard left right tilt and shift capabilities that are indispensable for making use of the limited depth of field in macrophotography. Accepts any Nikon F mount lens; the camera end is a standard F mount but practical compatibility will depend on the shape of your camera (some bulkier AF and digital cameras will require an additional extension tube not included to clear the back