so i've been doing a series of very long exposures of theatrical set builds and rehearsals. i'm using a laser pinhole with a stack of ND gels in front, to get exposures times ranging from 2 hours to 6 days.
now the exposures all look great, but i've reached a threshold of optimal sharpness that i'm unsatisfied with. i'm thinking of incorporating a lens, but i'm not sure if i should just get a glass lens with a shutter and stack even more NDs in front, or somehow make a frankensteined pinhole/lens chimera? i don't even know where to start doing research on that.
I know I'm not the first photographer to be doing long exposures like this, so I'm hoping somebody here has some experience.
here's some photographic evidence (dust included for scale):
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