IC434 Horse head

Posted: Sep 22nd, 2025

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NGC

Technical Info

Telescope/Lens: Askar SQA55

Camera: ZWO ASI533MC Pro

Mount: JUWEI 14

Guide Scope: ZWO ASI120mm mini

Guide Camera: SV105

Software: siril, graXpert, gimp

Exposure:

30 x 240" ISO/Gain: 100 - L-ultimate

White zoneLight Pollution:

G Moskva, Russia

Sep 22nd, 2025

2 h 0 m

957

Resolution: 2372x1605 px

Scale: 1571 KB

Dmitriy Korotkih

Updated

IC434 Horse head

25 Sep, 2025

5 h 0 m

Current photo

IC434 Horse head

22 Sep, 2025

2 h 0 m

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Comments

Dmcl

A nightmare to shoot in a white light pollution zone. Two hours on the Askar SQA and this result... On one of the brightest objects.

22 Sep, 2025 Reply

Dmitriy Korotkih Replied to Dmcl

I don't know whether to be happy or cry—I liked the stars so much myself, and I stretched them just the way I wanted.

22 Sep, 2025 Reply

Orfey13 Replied to Dmcl

So what? Everyone shoots how they want and what they like, especially if there's no chance to go out, for example. It's actually quite impressive for Bortle 9.

22 Sep, 2025 Reply

Dmcl Replied to Orfey13

I'm not judging. I'm with sympathy ) Don't be offended.

22 Sep, 2025 Reply

Dmcl

The stars are overexposed. You need to reduce the exposure time.

22 Sep, 2025 Reply

Dmitriy Korotkih Replied to Dmcl

Looking at your photos, both versions of 434 have stars that are a) overexposed, and b) clearly have shifted color balance.

22 Sep, 2025 Reply

Dmcl Replied to Dmitriy Korotkih

This is one of my first photos.

22 Sep, 2025 Reply

Dmitriy Korotkih Replied to Dmcl

Okay, so how did you determine that they are overexposed in my image? Could it be JPEG compression artifacts?

22 Sep, 2025 Reply

Dmcl Replied to Dmitriy Korotkih

If it's not overexposure, then it's errors in histogram transformation. This is definitely not JPEG artifacts. On any refractor, stars have a characteristic brightness profile. With proper exposure, brightness decreases from the center to the edge. In your case, the entire star area has uniform brightness. It results in a round blob with a halo. The SQA series is top-tier from Askar. This instrument performs well. You are taking criticism defensively. I wrote this so you would pay attention, not to offend you.

22 Sep, 2025 Reply

Dmitriy Korotkih Replied to Dmcl

Well, you could have written that right away—I might be a beginner too.

22 Sep, 2025 Reply

Dmcl Replied to Dmitriy Korotkih

I wrote exactly that - "The stars are overexposed. You need to reduce the exposure time."

22 Sep, 2025 Reply

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