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Handbook for SXV-M5C Issue 1 August 2004
5
2) Create a ‘Pin hole’ lens by sticking a sheet of aluminium 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.