Quote:
Originally Posted by Addos
Hi Martin
Yes, you do need separate flats for each filter. Not best practice - required.
Each one lets a slightly different amount of light through and refracts the light slightly differently. You'll see this in your flat wizard - no two filters should have exactly the same exposure time (assuming you're using a dynamic flat with a static light panel).
Focus doesnt matter. Leave it as is after your imaging session.
People often go overboard with flats. You may not need to take flats after every single imaging session if you're imaging setup is reasonably static. With my refractor and some precautions, I sometimes only need to take flats every month or so.
You are correct that the IMX571 likes bias calibration - keep doing that with the mono version. No need to take flat darks on this sensor.
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Thanks Adam,
Appreciate your comments
I have to take flats for each image as I image with Newts and my TS GPU 4 element wizz bang coma corrector introduces vignetting into the optical train (one of the trade offs for perfect pin point stars to edge of field )
Flats are no issue , Ive taken hundreds of them with my OSC 2600MC , so the 2600MM will just take a tad longer
Looking forward to Mono NB imaging especially when in Sydney under Bortle 7/8 skies ( SQM 18.50 )
Down at my south coast Obs ( Bortle 3 SQM 21.80 ) my existing 2600MC is excellent for Broadband and Narrowband , the new 2600MM hopefully will be mindboggling especially narrowband.
Cheers
Martin