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Amazon.com : D60 Telescope Accessories Secondary Mirror Newton Reflector Spherical Secondary Mirror DIY Astronomical Telescope : Electronics
![GOWE Newtonian Reflector Telescope Spider W/Secondary Mirror Holder F/ 8" Caliber : Amazon.co.uk: DIY & Tools GOWE Newtonian Reflector Telescope Spider W/Secondary Mirror Holder F/ 8" Caliber : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/I/41i75eg2fPL._AC_UF894,1000_QL80_.jpg)
GOWE Newtonian Reflector Telescope Spider W/Secondary Mirror Holder F/ 8" Caliber : Amazon.co.uk: DIY & Tools
![Diffraction effects of secondary mirror spiders on telescope image quality. | Download Scientific Diagram Diffraction effects of secondary mirror spiders on telescope image quality. | Download Scientific Diagram](https://www.researchgate.net/publication/47718414/figure/fig4/AS:668403207528448@1536371151016/Diffraction-effects-of-secondary-mirror-spiders-on-telescope-image-quality.png)
Diffraction effects of secondary mirror spiders on telescope image quality. | Download Scientific Diagram
![A Cassegrain telescope uses two mirrors as shown in figure. Such a telescope is built with the mirrors 20 mm apart. If the radius of curvature of the large mirror is 220 A Cassegrain telescope uses two mirrors as shown in figure. Such a telescope is built with the mirrors 20 mm apart. If the radius of curvature of the large mirror is 220](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1531698/original_20.png)