Astro Tutorial #1.5: Focal Length and Aperture V2 - enhanced audio

[@svg98]

This series is a god gift, thank you so much!

[@catchingphotons]

🙏 thank you for your encouraging comment!! Clear skies!

[@noone8609]

really thankful for the series of this video

[@catchingphotons]

You are very welcome! Thanks for your kind comment. Clear skies!

[@brandonsanders3095]

Thanks for this! As a beginner, I've been looking all over for this info!

[@catchingphotons]

Thanks Brandon! Glad the video was on any help!! Clear skies to you!

[@andregrodahn461]

The supercheapo 76/700 or 76/900 Newtons even with the tiny EQ2 or whatever the Minimounts are called can be, with some advice maybe from astrotreff.de or the astrocommunity of your choice, a really good starting Point!!! My Seben 76/900 outperforms the kids-scope-tasco-refractor in dimensions!!!! Especialy when upgrading the ultracheapo eyepeaces with only supercheapo eyepeaces from AliExpress or used on ebay!

[@catchingphotons]

Jep there are many good scopes for not much money. Maybe I should consider doing a video about those scopes :-) But you need the underlying principles to get a grip on their specs. Thank you Andre for your scope suggestions! Clear skies!

[@andregrodahn461]

I would bet that the 76/900 or 76/700 is THE most used sold Newtonian in Germany at all! There must be an humongous fabric in china grinding trillions of 76mm-mirrors 😁😁

[@stefanmayer444]

@@andregrodahn461 21,95€ ab 500 Stück aus China!

[@stefanmayer444]

I have one of these 10:36 cheap 76mm 700mm telescopes. How do they optically compare to something more professional? I mean just the mirror(s), not including the mount woubble, high tolerances in the focuser overall build quality etc. Could I combine 3 or even 7 of the primary mirrors to get a bigger aperture to create something like the Giant Magellan Telescope? I assume the mirrors in these cheaper telescopes are spherical, so as long as the bigger off axis angle doesn't ruin everything...or am I too unrealistic? I think a little functional model of the Giant Magellan Telescope would certainly look cool, but would it optically make sense with these mirrors? 🔭 x 3 = 🌌 ? 🤔

[@catchingphotons]

Haha!! I LOVE the idea but am highly in doubt about the practicability... To your question: the optical components of my BRESSER telescope are of very good quality. The main mirror is parabolic and delivers good quality images. The parabolic mirror is a problem when arranging in bigger constellations. Second problem to my understanding: by combining separate mirrors you also add the individual optical errors to a big total error. But on the other hand: such a scope - what a cool thing to imagine :-D Clear skies!!

[@stefanmayer444]

@@catchingphotons Thanks for your response. Yes, collimation will probably be a nightmare :-) I hope it won't take me as long as it's taking for James Webb ;-) Your assessment of the optical quality of these mirrors encourages me to try it out. If it's not working at all, I have some other ideas to try out with a few telescope mirrors.

[@raphnhat]

Hello Chris! You mention the good guide scope. Can you show in which video?

[@catchingphotons]

I've not jet done a video about guide-scopes but this will definitely come along. I use the Omegon 50/200mm guidescope with helical focuser and it works like a charm up until now. Clear skies!

[@texdoms]

Good refresh!

[@catchingphotons]

Thanks! Glad you liked it! Clear skies!