Telescope | Aperture: 70 mm | Focal length: 700 mm | Finderscope: 5 x 24
Is there a practical limit to telescope magnification? - Quora
Telescopes for Astrophotography
When building a refracting telescope, does the diameter of the eyepiece matter? And why do we need to move the eyepiece (as in my textbook) if the image is always focused at
Specifications of the Cassegrain Collimator | Download Scientific Diagram
Aperture, focal length and focal ratio - Optics Trade Blog