I think I figured out what color I want the sun to be

Posted on Sat 24 August 2024 in photography

At least through my telescope filter: Set the color temperature to 3500K, then drop the black level until outside of the sun loses most of the color cast. Unfortunately a high haze today, so I couldn't focus too sharp.

I started taking pictures of the sun earlier this year when I went "Oh, there's an eclipse in like a month that's within driving distance. I should do things." This lead to be buying a little Celestron NexStar 127SLT Mak telescope, which was about as cheap as I could go for a motorized mount (I didn't want to mess with tracking the sun when I could be watching the eclipse with my own eyes), and I knew from previous experience that hanging a camera off the eyepiece of a Newtonian scope was a wobbly unstable mess. Grabbed an E Mount T adapter since I had no clue where the one from my last attempt at this went, and whatever solar filter I could find that was in stock and would arrive before the eclipse.

Once I had everything, I set up the telescope in my driveway, and discovered that it's actually really hard to point a telescope at the sun during the day, even with a motorized mount that knows where it is with GPS. I eventually managed, and then shortly after 3d printed a little target thing that could go on the dovetail of the telescope sighting mount, and once I figured out where the sun should be on that, pointing at the sun was easy.

That worked well for the eclipse (I need to dig up some photos of that and post them here), and the telescope mostly sat idle after, since just about all of the planets were near the sun, if not in opposition. And being in suburban Kansas City the skies are nowhere near dark enough for anything approaching deep sky. Then the other night, I was going down the stairs, and noticed a bright star out of the window that wasn't normally there: Saturn had come into view above the trees I live near. That started the recent bout of astrophotography. I knew from trying to focus on the sun and moon that the mount the NexStar came with, while better than my previous attempt with a cheap Newtonian with an equatorial mount, was still prone to shaking as I adjusted the focus on the scope. Or even with the camera shutter firing. So I started the hunt for a new mount for the telescope.

I knew I wanted another goto mount, but equatorial this time. That would involve more hassle with polar aligning the mount and counterweights, but worth it for the smoother tracking. I wanted something my existing telescope would fit since the tube is still Good Enough™️, that didn't seem like a big deal it appeared that most have settled on a dovetail one manufacturer used (Vixen, I think. I don't know if they started it, but most ones I saw described it as a Vixen mount). And, not sure how much more I wanted to dip my toe into this hobby, I wanted it to be as cheap as could be. All this lead me to the Explore Scientific iEXOS-100-2. The controller box was well documented and seemed to have some open source support (Though things like Stellarium on Android didn't support it, as I found out, oh well), and was on sale for $350 at the time, and I pulled the trigger.

... and somehow ended up with an EXOS-2GT sitting in my driveway. A much larger mount meant for larger telescopes, weighing three times as much. Whoops. My tiny telescope was actually a problem since I couldn't balance it with the 10lb counterweights the mount came with, and ended up ordering a 3lb Manfrotto counterweight for microphones, which balances it. And also just in time for the hottest few days in summer in Kansas City and clouds and rain

First got it outside the other night to point at Saturn again, and discovered that it'll only jiggle for about a second after I adjust focus. And with it being sturdier I tried using a barlow lens I had and things were still rather solid. Though the android software for the mount only supports tablets, for some reason, and I felt silly with my giant 12 inch Samsung tablet.

And these sun pictures were testing how well the mount worked tracking the sun (not awful, though I need to get better at polar aligning the mount), and if I could get away with using a T adapter or the barlow lens stuck into the right angle adapter the telescope came with since everything was more stable. The answer is also yes.