Integrated Flux Nebulae in Ursa Major

891506

Mar 24th, 2026

461

NGC 3031NGC 2909NGC 2985NGC 3027NGC 3034NGC 3065NGC 3066NGC 3077NGC 3147NGC 3183NGC 2976NGC 2961NGC 2959NGC 3063NGC 3218NGC 2787NGC 2892IC 2574

Resolution:: 5982x4020 px
File size:: 17297 KB

Show astrometry on hover

Technical information

Telescope/Lens: Samyang 135mm f/2.0 ED UMC
Camera: ToupTek ATR2600C
Mount: ZWO AM5N
Guide Scope: SVBony SV106 60mm
Guide Camera: ToupTek GPM462M
Software: N.I.N.A., Siril, GraXpert, Adobe Photoshop, SAS Pro

Location: Липецк, Россия

Light pollution

Yellow, Bortle 5 zone

Date taken: Mar 22nd, 2026

Exposure

157 × 180″ · ISO/Gain: 100 · SV Bony UV/IR Cut

Total exposure: 7 h 51 m

Comments

poppy8micro

Whoa, awesome. I still haven't gotten around to my Samyang. Did you set up autofocus for it?

Mar 24th, 2026

lxkorReply to poppy8micro

Thank you. I have one EAF, and it's currently mounted on my Newtonian telescope, so I didn't remove it. I focused manually using a Bahtinov mask, and basically, I didn't touch the focus all night. Otherwise, everything needed is there—both the bracket and the strap. When I was shooting with a monochrome camera, autofocus was indispensable.

Mar 24th, 2026

poppy8microReply to lxkor

So, how are you liking the color version? Less hassle, obviously, but what about everything else?

Mar 24th, 2026

lxkorReply to poppy8micro

A feeling of inadequacy when I see the Bayer matrix on an image) (just kidding). I'm very used to monochrome. For conveniences, perhaps it's just that you need to shoot fewer flats. Otherwise, it's actually a decent camera; there's a slight tilt that needs to be addressed.

Mar 24th, 2026

poppy8microReply to lxkor

I wanted a monochrome sensor, but after the Chilean data, the magic was gone. In the end, the sky decides.

Mar 24th, 2026

lxkorReply to poppy8micro

There is no Chilean sky above me, and my heart is not drawn to remote work, at least not now.

Mar 24th, 2026

poppy8microReply to lxkor

Well, for practice and understanding the capabilities of different equipment, this is just the thing. Especially when there's no good weather for months.

Mar 24th, 2026

poppy8microReply to lxkor

And I'd say your skies are quite decent since you can capture IFN. And you clearly know what you're doing, judging by the results!

Mar 24th, 2026

Nickolay

Hello, can you tell me if the blue tint on stars is chromatic aberration? I've heard that Samyang lenses are supposed to be free of C.A., or does it depend on the specific copy? Or could it be defocus, as someone recently suggested to me? I'm just starting to shoot with this lens and an unmodified DSLR, and there are a lot of little blue stars. I'm wondering if I should even pay attention to this or not. Otherwise, I'd need to get all sorts of adapters for the lens—like an EFA guide and such—or sell it and get a small ED lens instead.

Mar 29th, 2026

lxkorReply to Nickolay

Hello, I was also unpleasantly surprised by the blue halos. I focused manually, and it's possible the focus drifted slightly overnight. I also suspect the UV/IR cut filter from Svbony. I captured the same region with a modified DSLR, and there didn't seem to be issues with blue stars there. The optics on my Samyang lens are certainly not perfect either.

Mar 29th, 2026

NickolayReply to lxkor

Understood, I'll test it in different setups, and hopefully with an electronic focuser. I'll try a setup with the ASI 662 MC guide camera—it's the only one available to me for now. I also have two DSLRs, one modified and one standard, but I don't have much confidence in either. Both were dropped pretty hard, and who knows how that affects the sensor.

Mar 29th, 2026