Telescope Aperture/Focus Masks
thingiverse
Telescope aperture/focus masks designed to fit an Optic Star AR90S Gold F5.5 Refractor - but should fit any refractor that has an OTA with an outer diameter of ~110mm (e.g. SVBONY SV48). Each mask has an 3d text on the inside with the aperture of the mask. You can of course scale these masks to fit any size telescope - just be aware that in doing so, the stated aperture will be incorrect. The masks are designed to stop down the telescope to the specified diameter in order to alter the focal ratio of the telescope. I designed these in order to increase the focal ratio of the telescope to be closer to the ideal range required by the Daystar Quark Chromosphere H-Alpha filter. There are 4 masks included in this pack (stated f-ratios are when starting from an F5.5 refractor) 70mm Aperture Mask - F7.1 60mm Aperture Mask - F8.3 50mm Aperture Mask - F9.9 Bhatinov Focus Mask
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