WebFocal lengths are also relatively short when compared to reflector designs making refractors an ideal choice for astrophotographers in search of a wide-field imaging telescope with shorter exposure times. Browse our selection of ED and APO refractor telescopes for sale below. ... Telescope Focal Length. 101mm - 400mm 7 items; 401mm - 800mm ... WebMar 13, 2024 · The Orion SkyQuest XT8 is a surprisingly large reflector telescope at a very affordable price . Though reflectors often perform better viewing galaxies or other deep-sky objects, it’s of sufficient size to view …
What Does Focal Length Mean? Orion Telescopes: Articles
WebFocal ratio is the simple formula F/D, where F is the focal length of the telescope and D is the diameter of the telescope’s aperture. The focal ratio is an important number to … Web2 - 4mm Eyepieces - Best for Observing the Planets & the Moon with a Short Focal Length Telescope. 5 - 10mm Eyepieces - Bestfor Observingthe Planets & the Moon with a Medium Focal Length Telescope. 10 - 20mm Eyepieces - Best for Deep Sky Objects and the Full Disc of the Moon. 20 - 30mm Eyepieces - Best for Viewing Deep Sky Objects. church school near me
Telescope focal length - Equipment (No astrophotography)
WebDec 12, 2024 · To calculate the field of view of a telescope, you will need to know the focal length of the telescope and the eyepiece used. The formula for calculating the field of view is: For example, if you have a telescope with a focal length of 1000mm and you are using an eyepiece with a focal length of 25mm, the field of view would be: WebJun 14, 2024 · The back focal length is advised by telescope manufacturers. Since most telescopes have a 55mm back focal length, we are here to provide detailed instructions for all ASI cooled cameras. ... Please be noted that this tutorial only applies to 55mm back focal length. And some adapters are not included in your camera box, thus you might need to ... WebJun 26, 2024 · One thing to keep in mind is that these telescopes at native focal length are f/10. That’s not going to be a lot of fun to image at. The focal reducers will drop the focal lengths 30%. ... (910mm focal length) with an ASI2600MC imaging camera, and guide it with a ZWO 60mm f/4.6 scope (280mm focal length) and an ASI174mm Mini camera. … church schools gozo