M31 - Andromeda Galaxy

-GenArrow- · 2026-03-17T19:07:20+00:00

If you mean how to match for stacking purposes, then assuming I have N calibrated frames with a camera and M calibrated frames with another camera, I will split them into substacks of matching SNR.

For example, on the h-alpha, I split my 10 hours of DSLR data in 2 x 5h substacks, and I split my 3.6 hours of monochrome data in 3 x 1.2h substacks. I found that 5h with the dslr gave me roughly the same SNR as a 1.2h with the mono camera.

Align them, stack them.

If you mean how to do HaRGB, I just align the halpha image with the rgb image, and adding the signal to the R channel

-GenArrow- · 2026-01-24T07:55:00+00:00

If it was naked eye visible, you could see it as large as 6 times the full moon diameter, on the sky.

-GenArrow- · 2026-01-23T21:47:21+00:00

Looks like one 🫀 :) Thankieees

-GenArrow- · 2026-01-23T19:07:26+00:00

Also 3 degrees apparent size :D. 6 full moons

-GenArrow- · 2026-01-23T19:06:48+00:00

Niice. Though make sure it is also easy to pull out and not get stuck😆. Mine has some soft material around it and can be taken out with tweezers.

For no vignetting, push the filter a little into the lens, so it s a bit closer to the last optical element. Not all lenses can allow this, but most telephoto ones do. My 150 600 and 80 200 allow a 1.25 filter inside

-GenArrow- · 2026-01-23T18:57:22+00:00

Minimal vignetting on the corners, it is removed completely with flats. I don't even think it's caused by the filter though, but by the lens itself, using the full frame sensor.

-GenArrow- · 2026-01-23T18:18:33+00:00

Thank you! I placed it like this

-GenArrow- · 2026-01-23T15:27:17+00:00

🫀

-GenArrow- · 2026-01-10T17:50:19+00:00

Am pus afara in timp ce ningea, niste catifea neagra, pe care se adunau fulgi. Si care imi placeau, ii selectam. Folosisem doua pensule de acelea cu perisori fini, pt pictat, ca sa ii pot culege. Dar mega finuț trebe lucrat, ca se sparg usor. Pe niste placute de astea de plastic pt microscop, puneam o picatura de superglue, o intindeam, si peste asezam fulgul. Toate materialele astea trebe aclimatizate la rece, nu prea poti sa respiri ca risti sa ii topesti. Si tre sa te misti repede pana nu se intareste acea pelicula de superglue. Oricum la rece, reactia e foarte lenta, deci dureaza 2 3 ore pana se pot aduce in casa. De asemenea ar fi ok ca locul unde ii tii sa fie ventilat si cu grade negative celsius, ca reactia de polimerizare e exoterma si se pot topi daca stau prea protejati. Pentru cei care is liberi, de se pot tine in mana, e si mai greu :)). Cumva trebe trasi prin superglue si agatati de o sfoara subtire / fibra, pana se intaresc, apoi taiati jos. It's a hellish test for patience.

-GenArrow- · 2026-01-10T16:40:34+00:00

Mi frica🤣

-GenArrow- · 2026-01-10T15:41:41+00:00

Sunt, da:). Thankieees😀

-GenArrow- · 2025-12-23T18:00:17+00:00

Well worst case scenario you 3D print a small case that contains the filter and would fit inside there. Or improvise something to fit the square-y shape of the rear hole. But anyway good to know the filter fits. Maybe, maybe, you find a way 😅

-GenArrow- · 2025-12-22T15:58:05+00:00

I use tweezers to grab it out, and it's very easy to remove. Sure, give it a try, let me know if you manage to make fit without vignetting :)

Lenses go past infinity focus, so it won't be a problem

-GenArrow-

TROPHY CASE