Meade ETX125 easy collimation

I have noticed that my ETX125 airy disk developed two hot spots which mean it got out of collimation a bit.

My favorite for eons Weasner website has a lot of information on that but it's mostly "don't do that yourself", "be super careful", and very little on the actual subject with quite a conflicting tips. So here is how I've done it:

Laser collimator external power mod 2

Just a bit over a year passed since the previous emergency mod I did to my laser collimator. It's been serving me so well after that the version 2 has been postponed until I had to print something small to test the new printing bed.

The construction design is very simple and based around the micro USB PCB I've got off eBay for like $0.75 a pair. It went out very nicely overall and works flawlessly. Goodbye "pill" batteries.

Planisphere Android Widget

For several years I've been looking with envy at the Android Smart Watch custom clock face with that simple planisphere on it and wanted something like that on my phone screen as well. I thought it's obvious to port the wearable screen to the regular one and had been waiting for a couple of years for that to happen... No luck. But finally, the wait is over.

I had some time this spring to implement it! Looks gorgeous between my other informational widgets, which I am consulting with several times a day:

Cheshire Eyepiece

The Cheshire eyepiece is the simplest telescope collimation device. There are plenty of makeshift solutions, like the film canister with the hole in the cap, but the best guide for making a decent one along with all the underlying theory can be found here. One day I've decided to shim my Astroscan front glass to improve the collimation and 3D printed my own Cheshire.

The construction looks very simple, but there are several important features making the collimation and the printing easier.

Camera Lens Bahtinov Mask

Just got an idea to try the Bahtinov mask on my Tair 3S telephoto lens on the CN forum. As I had in mind 3D printing of the front camera attachment for the solar filter anyway, I decided to print the mask instead of just an ordinary ring as I usually do in order to get the perfect snug fit.

Even though painting it black should improve testing it works very well as is.

Astroscan focuser mod

After seeing the eyepieces for the Astroscan discussion on the CN forum I decided to showcase my simplistic focuser modification, which I use to convert my Astroscan into a powerful 101 deg AFOV monocular which I'm often enjoying between 12" dob sessions.

It's basically an adaptor between Astroscan focuser's drawtube opening and the WO UWA 9mm eyepiece with 101 deg AFOV.

DIY 2x54 ultra wide field monocular

One lucky day I have discovered on the CloudyNights.com forum that a really great optical tool for the truly wide field observing of the starry sky could be made for less than $30 out of the very common Nikon TC-E2 2x zoom camera adaptor!

With the help of 3D printer, I've managed to turn it into a really convenient to use monocular.