Astrophotography Basics #2 | The Dark Frame
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- čas přidán 21. 07. 2024
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The most recent generation of cooled cameras eliminates the need for dark frames. Zero amp glow for my current ASI 2600 MC. Now I do bias, flats and dark flats with good results. This is a big Time saver cuz darks a real pain in the butt. Thank you.
Bias or dark flats are only used to subtract from flat frames so only one is needed , darks do work if properly calibrated which dss does not do , but nebulosity does and would think APP , pixinsight, Siril do .
Really great work Tim !
I like your way of explaining these topics. Need more videos!
super super merci beaucoup Tim ! tip top !
Your videos are always great, ive managed to capture my first images learning from you. Thanks a lot!
Happy to help!
Hi Tim, thanks for the video. In your next video can you also send some time on flat darks and maybe also specifically some of the idiosyncrasies I have heard about the 294 needing at least 3 sec exposures when taking flats (or your take on that)?
Clear skies and greetings from NL,
Jos
That's one of the things I want to talk about!
Thanks Tim. I consider you to be the Keaftwerk of the astro video ! (That's meant to be a compliment) ;-)
I like your concise videos. No rambling. I could not find where you gave a recommendation of how many dark frames minimum should be taken. ????
I usually go for 30
keeping ISO low increases noise though?
No, it's the opposite. High ISO results in high noise. But keep in mind that every camera has its own optimal ISO
@@AstroAddict im new to this but i understand that that's only if you are forced to decrease your exposure time due to increasing the ISO. if exposure time remains the same, and you equalize the exposures in lightroom or whatever, you'll see that the lower the ISO, the noisier the image. this is called read noise.
The source of read noise is not the ISO. It is also not depending on the exposure time ot sensor temperature. The strengh of read noise is always constant, since every pixel has it's own AD-converter and amplifier (CMOS). The reason why you see more noise in a shorter equalized exposure - as you described - is that there is less signal rising above the noise threshold
@@AstroAddict i meant equalizing whatever EV means so that all photos have the same brightness. when i tested this all settings remained the same except for ISO. exposure time was 10s for all of them.
Too much speaking... wasting more time...we need less talk more information