Dew Shield / Lens Hood for Skywatcher EvoStar 72ED

2023-08-06 22:55:40

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Dew Shield / Lens Hood for Skywatcher EvoStar 72ED

Summary

I like to do astrophotograhy from my balcony, because I am lazy, but I do have an annoying street lamp close by, so I wanted an additional lens hood with some flocking on the inside to minimize the effect of it for my for Skywatcher EvoStar 72ED.

I designed this in FreeCAD with an inner diameter of 91mm, which is just enough to fit over the existing dew shield. It sits quite snuggly, so I recommend slicing a bit off the bottom and do a little test print ring. There is a large groove to attach things to, which I thought might come in handy, since the telescope is very back heavy and might need some counterweight. The thickness of the hood is designed to be exactly 4 perimeters of 0.4mm which provides good stability. I attached a black adhesive foam band to prevent the hood from sliding further down. It is not fixed in the other direction, since telecopes tend to be pointed upwards anyway ;)

I bought an adhesive flocking mat at https://www.amazon.de/dp/B005FWUK44 out of which I cut a 100x317mm piece and stuck to the inside of the front of the hood.