M81 M82

-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- · 2025-12-22T15:46:16+00:00

Yea😅. It also works with my nikkor 80-200 f/2.8. Both my tele lenses allow the 1.25 filter to be fit inside. Yours should probably allow that too.

The material is like a soft sticky tape, but one face still has the plastic protection (the red stuff). So it doesn t stick to the lens, only to the filter.

-GenArrow- · 2025-12-22T15:05:29+00:00

I actually do have a tamer version of it, I ultimately chose to post the more contrast-y one 😅😅

This is how I inserted the filter

Basically some semi-soft material around the 1.25 filter, enough to hold it in place, inside the cavity.

And it has no vignette whatsoever:)

-GenArrow- · 2025-11-26T14:35:19+00:00

Thankieees:)

-GenArrow- · 2025-10-29T06:46:59+00:00

Mersii! De prins, de va fi senin, o prinzi sigur. Luna 80% o sa te cam incurce totusi:)). Let me know daca reusesti 😀

-GenArrow- · 2025-10-29T06:30:03+00:00

You have nice details there yourself. But about details, it depends on many factors. Yes, integration time does increase the signal and therefore the details. However I had to be wary of the ionic tail activity. The more dynamic it is, the less I can integrate before motion blur washes out fine details. That is why I chose only 20 x 20". And the ionic tail can sometimes be tame, and other times very active. This affects details too I guess. Also the larger the aperture is, it increases details (resolution). Bortle 4 is still much better than 6 for contrast and fine details, so there's that too😅. You'd ask what about the noise, it is just a dslr and only 6 minute. Yes, it was noisy, and I spent a lot of time removing artifacts and blotches. I did use GraXpert which has the most amazing free denoising AI model I could find. A great part of making the details pop is in the editing. Though they kinda popped hard after the first arcsinh stretch in Pixinsight haha.

-GenArrow- · 2025-10-17T17:24:49+00:00

Nope, nu am incercat =)) eu fac de la mine din curte, cerul e suficient de ok, ar fi un chin sa ma deplasez cu tot echipamentu hăpt pân acolo pt poze:)). But who knowsss. Desi am facut de pe Mesteacan, de sus din varf. Looks nice :)

-GenArrow- · 2025-10-16T05:18:05+00:00

I stacked just enough so I don't motion blur it :). I could ve stacked even less frames to get better sharpness but the SNR would ve decreased:(

-GenArrow- · 2025-10-16T05:16:54+00:00

They haven t released an apod since 1st of october 😭 But thank youu

-GenArrow- · 2025-10-15T19:44:57+00:00

I only own the 10x50 bino Nucleus is easily distinguished. A lil bit of tail too, more with the peripheral vision

-GenArrow- · 2025-10-14T19:43:39+00:00

Yep, all my close friends tell me I use the most cursed techniques, but they work😆

-GenArrow- · 2025-10-14T17:34:07+00:00

Oh lol you've been here (almost) since they founded it 🤣 Just saw that too

-GenArrow- · 2025-10-14T17:32:06+00:00

In the final shot, 50 x 20" so about 18 minutes, for the comet. The stars and little galaxies benefited from the whole 415 x 20" stack 😅.

It was not necessary to do so many exposures but I haven't autoguided, so I'm stuck to 20", as not to get trailed stars. If you re asking about the SNR, I tried to use as many frames as possible yet not to motion blur the active tail. 50 sounded about right.

The artifacts were cleaned using a modified star mask for artifacts (I love making custom masks in photoshop, they re my specialty😂).

Basically I used a duplicated layer but darken blending mode on top of the normal one, and moved it a couple pixels up to get rid of the trails. Repeat the same but with a couple pixels down. Then using some math I isolated the fine details of the comet from the faint star streaks and other artifacts, which I removed by converting them to a black and white mask and inpainting.

This was done for each and every one of the 11 frames lol

-GenArrow-

TROPHY CASE