Collimation of a Schmidt-Cassegrain telescope: the complete guide (Celestron NexStar Evolution) | Deep Space Astronomy Practical guide - Astrophotography How to collimate a Schmidt-Cassegrain telescope Star test, secondary mirror adjustment and all our advice to give your Celestron NexStar Evolution a perfectly sharp image. Level: beginner to advanced Reading: approx. 9 [...]
On some Sky-Watcher Stargate motorized Dobson telescopes, notably the Sky-Watcher Stargate 400P GoTo, it can happen that the altitude drive belt gradually shifts as the telescope climbs towards the zenith. The symptom is fairly typical: at low altitude, everything seems to be working normally; at around 45°, the belt starts to shift; near [...]
A telescope is two things: a mirror (or optical system) that collects light, and a set of eyepieces that transform this light into images. The tube does 80 % of the work; the eyepieces do the 20 % you actually see. You might as well choose them carefully. This article is aimed at owners (or future owners) of [...].
You've just unpacked your brand new Dobson GoTo Sky-Watcher - perhaps a 200, 250 or the famous 305P FlexTube SynScan - and you can't wait to discover the wonders of the deep sky without searching for your targets for hours. You launch the alignment, carefully center your first star... and then, when the telescope starts [...]
Hello everyone, I'd like to introduce you to a rather colorful nebula in summer: IC1396, better known as the Elephant Trompe. My father sees it more as a woman with a vaporous face. How about you? In any case, this image was taken in rather poor conditions. It's very low on the [...]
For years, with my old CCD and its small 11×11 mm sensor, I didn't ask myself too many questions. I'd shoot as many exposures as possible, throw it all into integration, and leave PixInsight to clean up afterwards. A few corrections here, a little gradient there - I was good to go. Then I [...]
First light: The Rosette in SHO from my rooftop in the middle of the city That's it, my first image is out! 🎉 Those of you who follow me will know that I was setting up a new setup with a rather crazy brief: to shoot deep sky (and especially extended nebulae) from the roof [...].
Choosing your first telescope is a pivotal moment. It's the moment when dreams meet technical reality. Between dubious marketing promises, incomprehensible data sheets and contradictory forum opinions, it's easy to get lost - and worse, discouraged. After hundreds of hours spent under the stars, some [...]
This guide summarizes and translates the “Find the Perfect Telescope...” pages from Askar/Sharpstar (July 2025). It helps you choose your telescope based on your objective (visual, astrophotography or mixed), your budget and the weight of the optics, with clear tables and practical advice. Why Askar/Sharpstar? Consistent ranges covering [...]
NASA announced in early September 2025 that it had detected what it described as the most promising signs of life to date on Mars. This revelation follows in-depth analysis of a rock sample taken in July 2024 by the Perseverance rover in the Jezero crater - the [...].
