70mm minor axis secondary mirror, short side length 70mm, surface aluminized film and protective film, suitable for 203mm aperture mirror primary mirror. Minor shaft diameter: 25mm Package includes: 1PC25mm（1.98inch） secondary mirror The Tombow MONO Zero Eraser features a sleek silver barrel and a retractable design, making it a stylish and practical tool for professionals. Weighing only 9 grams, it includes an extra refill for long-lasting use, ensuring precision and convenience in every stroke How to Replace, Offset, and Collimate a Secondary Mirror It's not uncommon that a low quality, small or a badly attached secondary (diagonal) mirror ruins a telescope with otherwise perfect optics. This article gives an example of a Newtonian telescope secondary mirror's replacement, offset calculation, collimation, star testing GOWE Newtonian Reflector Telescope Spider W/ Secondary Mirror Holder F 40mm minor axis auxiliary mirror, short side length 40mm, surface aluminized film and protective film, suitable for 127mm, 133mm, 135mm, 150mm aperture mirror main mirror. 25mm minor axis auxiliary mirror concave spherical mirror, surface aluminum and protective film. Astronomical Telescope Accessories Main Mirror D114F900mm With 3D Printed If necessary, please wipe them gently with a high-quality lens cloth (note, otherwise it will affect the performance of the telescope) Newton reflecting telescope D25 reflection objective secondary mirror 35mm minor axis auxiliary mirror, short side length 35mm, surface aluminized film and protective film, suitable for 127mm, 133mm, 135mm, 150mm aperture reflective primary mirror. 25mm short axis sub-mirror, the short side length is 25mm, the surface is coated with aluminized film and protective film, suitable for use with the 114mm diameter reflective primary mirror. After drying, observe the light source from the side to see if there is cotton wool or water stains on it.
