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FORUMS Photography Talk by Genre Astronomy & Celestial Talk
Thread started 21 May 2012 (Monday) 13:42
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Stacking question

 
nu8reed
Member
51 posts
Joined Feb 2011
May 21, 2012 13:42 |  #1

I had a question regarding bias and flat frames. Assuming I use the same camera, ISO, lens and focal length, can I use the same bias and flat frames? Wouldn't the flat frames always be the same for a particular lens? How would it be different from correcting vignetting with lens correction in lightroom or peripheral illumination correction in DPP?

After reading the DSS FAQ, I understand light, dark and flat frames, but I do not understand how bias frames work.




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A.S.I.G.N. ­ Observatory
Goldmember
A.S.I.G.N. Observatory's Avatar
Joined Aug 2008
Canberra, Australia
Jun 22, 2012 23:12 |  #2

Flat frames not only correct vignetting, but also any dust motes in your imaging train.


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ASIGN Observatory II (external link)

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jannefoo
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68 posts
Joined Jun 2012
.fi
Jun 26, 2012 07:39 |  #3

LR lens correction profiles vary wildly in quality. Some are acceptable, some borderline unusable.

Compare these, first two images with two different LR profiles and then a flat field corrected image:

IMAGE: http://i.imgur.com/WxVGT.jpg
(Unusable)

IMAGE: http://i.imgur.com/5w2o1.jpg
(Acceptable)

IMAGE: http://i.imgur.com/FFs6c.jpg
(Perfect correction with flat field)

my flickrexternal link | blog about panoramic photographyexternal link

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nu8reed
THREAD ­ STARTER
Member
51 posts
Joined Feb 2011
Jul 03, 2012 12:26 |  #4

jannefoo wrote in post #14633235 (external link)
LR lens correction profiles vary wildly in quality. Some are acceptable, some borderline unusable.

Compare these, first two images with two different LR profiles and then a flat field corrected image:

[IMG]
(Unusable)

[IMG]
(Acceptable)

[IMG]
(Perfect correction with flat field)

Nice.

To reword my previous question, if you are using the same lens, with the same settings, could you use the same flat frames? Or is it better to take new flat, dark or bias frames every time?




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Stacking question
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