Mkv

I'm not sure about your particular telescope, but if the secondary collimation screws are missing, then you'll need to find a replacement. You might as well get yourself thumb-turn screws, the SkyWatcher 250P uses M4 thread 35mm length screws, so yours might be similar

Thank you for sharing this. Quite likely I will need to adjust the design, as in one description the lens is 80mm, in the other it's 83mm. A good opportunity to learn FreeCAD

As I was getting back into astronomy and reading forums over the past few weeks, I saw David's name mentioned quite often. It is sad to learn that he's passed away. RIP, you're with the stars now

Hello, A theoretical question. Say I have a large single lens that is not corrected in any way, and produces chromatic aberration (so not a doublet or a triplet, etc). Would it then be possible to take separate pictures with red/green/blue filters with focus adjustments, and then stack them to produce a better image?

Looking great! I've got a D83mm F400mm lens on the way, and I'm planning to do something similar. Any chance you could share the 3D design on Thingiverse please?

Any chance you could instead use a lighter aluminium tripod? And use a very large power bank (or power station) to power your set-up. Then you could hook the powerbank onto the tripod hanger to provide additional stability and weight, and keep the power bank out of the way.

Hello, In 2005-2006 I was a young lad, 16-17 or so, and I was interested in the skies. Read space news on a daily basis, was playing a lot of OrbiterSim, had APOD as my homepage. Eventually I saved enough money for a telescope and bought myself a Skywatcher (probably Explorer) 130mm with 900mm focal length and a spherical mirror. My fondest memory was accidentally seeing the ISS whizz past while looking through the telescope, it was a great bright thing and obviously I did not see any detail, just a bright point. Only afterwards I figured out it was the ISS when I checked on a website or through some software. I was inexperienced, and only a few weeks ago I realised that the telescope had an equatorial mount, and back then I was just using it as an alt-az mount. I moved to UK just a year or two later, and I had to leave the telescope behind. My aunt has kept it safe and has still got it. Fast forward to late 2023, I've settled down, got a house on a mortgage, two young children running about. And the sky watching bug bit me again. First I bought a Bresser Messier 5", understood what's good and what's bad about it, and just more than a week ago got myself a used Skywatcher Flextube 250p. Now I want to motorise the 250p using OnStep, want to build a small telescope for my 3 year old using cheap mirrors from AliExpress, perhaps make my own mirror one day, etc. So I thought it would be good to join a community, and here I am based north of Cardiff, close to the A470