![In a reflecting telescope (Cassegrain), is there a difference between using a concave or convex secondary mirror? - Astronomy Stack Exchange In a reflecting telescope (Cassegrain), is there a difference between using a concave or convex secondary mirror? - Astronomy Stack Exchange](https://i.stack.imgur.com/n80ol.jpg)
In a reflecting telescope (Cassegrain), is there a difference between using a concave or convex secondary mirror? - Astronomy Stack Exchange
![In a reflecting telescope (Cassegrain), is there a difference between using a concave or convex secondary mirror? - Astronomy Stack Exchange In a reflecting telescope (Cassegrain), is there a difference between using a concave or convex secondary mirror? - Astronomy Stack Exchange](https://i.stack.imgur.com/j0i4Y.jpg)
In a reflecting telescope (Cassegrain), is there a difference between using a concave or convex secondary mirror? - Astronomy Stack Exchange
![The classic Cassegrain telescope has a parabolic primary mirror and a hyperbolic secondary mirror | Webel IT Australia The classic Cassegrain telescope has a parabolic primary mirror and a hyperbolic secondary mirror | Webel IT Australia](https://www.webel.com.au/sites/default/files/media/slide/2574/The%20cassegrain%20telescope%20%28sometimes%20called%20the%20_Classic%20Cassegrain_%29%20...%20has%20a%20parabolic%20primary%20mirror%2C%20and%20a%20hyperbolic%20secondary%20mirror.annotated.png)
The classic Cassegrain telescope has a parabolic primary mirror and a hyperbolic secondary mirror | Webel IT Australia
![An example Cassegrain telescope system with a primary mirror at F/1.2,... | Download Scientific Diagram An example Cassegrain telescope system with a primary mirror at F/1.2,... | Download Scientific Diagram](https://www.researchgate.net/profile/James-Breckinridge/publication/292215849/figure/fig6/AS:668522648723459@1536399628147/An-example-Cassegrain-telescope-system-with-a-primary-mirror-at-F-12-a-Cassegrain-focus.jpg)
An example Cassegrain telescope system with a primary mirror at F/1.2,... | Download Scientific Diagram
![Color online) (a) 3D Layout and (b) 2D layout of a optical Cassegrain... | Download Scientific Diagram Color online) (a) 3D Layout and (b) 2D layout of a optical Cassegrain... | Download Scientific Diagram](https://www.researchgate.net/profile/Po-Kai-Chiu/publication/249509780/figure/fig5/AS:325103830224903@1454522201230/Color-online-a-3D-Layout-and-b-2D-layout-of-a-optical-Cassegrain-telescope-system.png)