ZWO ASI224MC Small DSO

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oopfan
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Re: ZWO ASI224MC Small DSO

#11

Post by oopfan »

Hey,

ZWO specs say that the sensor is 1304 x 976 pixels. Strangely, your two attached PNG files are 544 x 358 and 678 x 448, respectively. Someone cropped these images?

Brian
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oopfan
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Joined: Sat Jul 08, 2017 2:37 pm
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Re: ZWO ASI224MC Small DSO

#12

Post by oopfan »

Here is your camera's field-of-view (FOV) with the Cat's Eye Nebula centered:
cats-eye-4se-asi224-fov.png
cats-eye-4se-asi224-fov.png (328.97 KiB) Viewed 382 times
(courtesy of KStars and astronomy.tools)

Here is one of your frames:
Cats Eye Frame 1.png
Cats Eye Frame 1.png (285.82 KiB) Viewed 382 times
My best guess is that:
1. The large green ball in your image is the nebula.
2. The oblong "star" at the 7 o'clock position in your image is the same bright star seen at the 1:30 position in the KStar image, accounting for the fact that someone or something cropped your image.

Now the question is: Why is that star oblong? It could be due to two things:
1. Your mount isn't tracking well.
2. Your optics have got some significant optical distortion.

To determine which one, you need to run some tests. Are you game?

Question:
With tracking turned on, did the nebula remain in the center of the frame over the course of 10, 20, 30 minutes? Or did it drift out which required you to re-center it?

Brian
Buckrogers
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Re: ZWO ASI224MC Small DSO

#13

Post by Buckrogers »

Yes I am game, the next time I have clear skies I'll try it out. Thank you so much.
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