Size isn't everything! :biggrin: Its the quality that matters.
This is the sort of lens I really like: the leaf shutter is manually cocked, the shutter speed and aperture manually selected and the focussing done by moving the board mounted lens in and out and tilting where necessary. No idiot proofing whatsoever. If you forget to remove or replace the dark slide then you either get no exposure or you ruin your freshly exposed image.