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Originally Posted by Starkler
Going by the fact that ambient light needs to be quite low to see a shadow on a barlowed laser, I dare say that this Krupa collimator would only be able to be used in darkness.
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It depends on how bright the LED is. It's easy to use at normal daytime indoor light levels, using a Jaycar 2800 mcd red LED (cat. No. ZD104) with a 150 ohm resistor in series with three 1.5 volt A76/LR44 button batteries. This may be a wee bit bright at night, so a refinement might be to drop the current by switching in a second resistor (or a small potentiometer).
The only trick in using it is to get the eye centred in the field of view, otherwise you see black "blobs".
DN