52mm Drawtube Cap for Darks on Newtonians
Description
Newtonians... If you have one, you probably noticed you cannot take Dark Calibration Subs even at night as these large tubes Leak a bit of Light.... I have created this cap to be placed on the Drawtube from internal area. Of course, main telescope cap/cover also should be used to make internal area even darker. Did few test with ASI1600MM at 1pm during a sunny day: 1) gain 0 darks look very good up to 300sec 2) the same with unity gain 3) not sure with gain 200...it seems some light is till leaking in... somehow... 4) Not yet tested at night time, - should work OK... Let me know how it performed if you will decide to test it. Cap is for 52mm Drawtube tube, in my case it is Skwatcher 130PDS standard Crayford Focuser. (P.S. I printed with 88% infill using Black PETG)
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