I have a plastic lensed Holga. I "broke" the lens by hammering on a step up adapter so I can shoot with filters. Well it's not broke, but the lens does come off if you unscrew it too far. And I used a make-shift ground glass to make a new focus scale. The lens is sharp enough for me in the middle, and the edges wonderfully blur out. I think I would prefer a Diana, just because of the F/stops, but since I have the Holga I won't bother.