Handbook for
2)Create a ‘Pin hole’ lens by sticking a sheet of alu minium baking foil over the end of the 1.25” adaptor and pricking its centre with a small pin.
If you use a normal lens, then stop it down to the smallest aperture number possible (usually F22) as this will minimise focus problems and keep the light level reasonable for daytime testing. The pin hole needs no such adjustments and will work immediately, although somewhat fuzzily.
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