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Old 01-08-2018, 09:46 PM
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Stonius (Markus)
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Darks on planetary or autoguiding?

I haven't bothered with darks on these because I figure with short exposure times, what's the point, but Firecap and PHD2 both seem to offer this. Am I missing out? Is it really going to make that much difference to either the quality of planetary images or the accuracy of the autoguiding?

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Markus
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Old 01-08-2018, 10:25 PM
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ChrisV (Chris)
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You can't imagine they would do much. But what about bias frames ?
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Old 01-08-2018, 10:50 PM
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Stonius (Markus)
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Maybe I've misunderstood and it's more about hot pixels.

Markus
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Old 01-08-2018, 11:07 PM
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troypiggo (Troy)
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Recently started using dark library in PHD and it does seem to improve SNR. Wouldn't say it's necessary, but does seem to show some benefit.

Can't help on the planetary side of things.
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Old 01-08-2018, 11:26 PM
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Stonius (Markus)
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Quote:
Originally Posted by troypiggo View Post
Recently started using dark library in PHD and it does seem to improve SNR. Wouldn't say it's necessary, but does seem to show some benefit.

Can't help on the planetary side of things.
Do you have to build a dark library every session (my camera is not cooled, so operating temps vary)?

Markus
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Old 02-08-2018, 06:15 AM
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Mine isn’t cooled either. ASI120MM. It remembers the library so only do once.
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Old 02-08-2018, 09:01 AM
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Stonius (Markus)
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That's weird. Isn't the whole point of dark noise that it's temperature dependent? I thought it would have to do it all over again whenever the temperature varied by more than 2 degrees.

Strange.

Markus
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Old 02-08-2018, 09:19 AM
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Merlin66 (Ken)
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Markus,
I think it's more to do with reducing/ removing annoying hot pixels.
I have a few on the Lodestar, and using darks in PHD2 certainly cleans things up.
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Old 02-08-2018, 09:38 AM
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Quote:
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Markus,
I think it's more to do with reducing/ removing annoying hot pixels.
I have a few on the Lodestar, and using darks in PHD2 certainly cleans things up.
Thanks Ken. Makes sense :-)

Markus
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Old 06-08-2018, 10:06 AM
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Quote:
Originally Posted by Merlin66 View Post
Markus,
I think it's more to do with reducing/ removing annoying hot pixels.
I have a few on the Lodestar, and using darks in PHD2 certainly cleans things up.
Pretty sure you got it there. Especially as people up the gain on their cams to horrid levels it'll help. Particularly at high magnifications too.
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