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Old 10-11-2019, 01:20 PM
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Icearcher (Chris)
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Reusing Dark Frames

Hi All

A question on dark frames:

At present, I collect my dark frames at the end of each night out, I usually managed to get 12 darks (an hours worth of 5min subs) and usually find that I can use about 10 as the first two are often out due to temp.

My question, since I capture 5 min subs at iso 800 almost every time and I now have quite a few that are all around the same temp, can I reuse darks from other nights out as long as I can get the temp to match?

Is there anything I need to know in regards to building a darks library.

The aim is less time collecting darks and more time collecting photons.
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Old 10-11-2019, 01:41 PM
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RobF (Rob)
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Hi Chris

If you have a thermometer on your imaging rig (even just a cheap one attached with velcro) then no reason you can't assemble a darks library - for Canon DSLRs you're probably ok if within 2-3 degrees, or even 5 deg.

Remember you can shoot them on cloudy nights, or inside in a closest (or even the fridge).

My wife was puzzled one night why the air con was going full bore when everyone was asleep upstairs. Said I needed more darks at 19 degrees and seemed a fair enough way to get them
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Old 18-11-2019, 11:53 AM
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You can use adapted darks that are not temp dependent as they work off the bias.

Images Plus does that. So does CCDstack.

Greg.
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