I'm pretty sure you will need the bag bellows - as the regular bellows are
straight not tapered, by the time they are closed up tight to get anywhere
near enough for 75mm you couldn't move them (I haven't tried it, but I doubt
you could get close enough for it even with a recessed board. I don't think
I can manage that even with a 90mm. FWIW I use the pleated bag ballows for
lenses from 75mm to 210 and rarely use the regular ones)
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