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INDI Library v1.8.8 Released (09 Jan 2021)

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Light leak

2 months 1 week ago
mhammady
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Light leak #62943
Hello,

After changing my camera to a monochrome one, I found what looks like a light leak always comes from the right side of the shots when exposure is 30 seconds or more. I tried to locate the source without success. Any idea how to solve this problem is appreciated...



Thank you
Mohamed

- Mohamed

Celestron 8SE, Sky-Watcher HEQ5 Pro mount, Raspberry Pi 4 Kstars-Ekos-Indi server, MyFocuserPro2
ZWO OAG with ASI120MM Mini (mono) guide, ZWO ASI183MM Pro, Canon 600D T3i, ZWO EFW (LRGBHaS2O3), Celestron f/6.3 reducer

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2 months 1 week ago
knro
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Light leak #62945
That's amp glow. It's a known issue for CMOS camera, you can read more on it.

Btw, your stars are either out of focus, or saturated, or both.

Jasem Mutlaq
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2 months 1 week ago
mhammady
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Light leak #62952

knro wrote: That's amp glow. It's a known issue for CMOS camera, you can read more on it.

Btw, your stars are either out of focus, or saturated, or both.


Thanks Jassem, I’ll look into the cmos amp glow.

About the stars being out of focus or saturated, I understand the out of focus but not the saturated part. Can you please highlight what do you mean by that?


Thank you
Mohamed

- Mohamed

Celestron 8SE, Sky-Watcher HEQ5 Pro mount, Raspberry Pi 4 Kstars-Ekos-Indi server, MyFocuserPro2
ZWO OAG with ASI120MM Mini (mono) guide, ZWO ASI183MM Pro, Canon 600D T3i, ZWO EFW (LRGBHaS2O3), Celestron f/6.3 reducer

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2 months 1 week ago
Bart
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Light leak #62955
When light still generates signal on the imaging chip, but the maximum value that can be recorded is already reached.
Then some information about the shape of the star is lost, because it will be truncated.

15 cm wavefront condensor | Earth rotation undo-er | Few photon discriminator plates | Photons to electrons transmogrifier | Stellarmate

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2 months 1 week ago
mhammady
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Light leak #62958
Thank you Bart. I've been reading about the proper GAIN/offset/exposure calculations for my camera, and it seems that I'm lost. Is there is an easy way to calculate the proper values to be used when we decide to make exposure?

- Mohamed

Celestron 8SE, Sky-Watcher HEQ5 Pro mount, Raspberry Pi 4 Kstars-Ekos-Indi server, MyFocuserPro2
ZWO OAG with ASI120MM Mini (mono) guide, ZWO ASI183MM Pro, Canon 600D T3i, ZWO EFW (LRGBHaS2O3), Celestron f/6.3 reducer

telescopius.com/profile/mhammady

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2 months 1 week ago
Ihoujin
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Light leak #62962
Dark frames are also an effective method to remove amp glow.

INDI/KStars on Raspberry Pi 4, 4gb
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Canon 600D Camera
Orion SSAG/ASI120mm @280mm Guide Scope
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2 months 1 week ago
mhammady
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Light leak #62983
Thank you Ihoujin... You are correct. In my yesterday shooting for M1, I found that I've been using the wrong exposure for the dark frames. I shot them again, and all the glow is gone away.

- Mohamed

Celestron 8SE, Sky-Watcher HEQ5 Pro mount, Raspberry Pi 4 Kstars-Ekos-Indi server, MyFocuserPro2
ZWO OAG with ASI120MM Mini (mono) guide, ZWO ASI183MM Pro, Canon 600D T3i, ZWO EFW (LRGBHaS2O3), Celestron f/6.3 reducer

telescopius.com/profile/mhammady

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