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Ko Hummel

Ko Hummel club

Posted: 03 Jun 2021

Taken: 01 Jun 2021

10 favorites     5 comments    88 visits

14.9 sec. • 0.0 mm • ISO 3200 •

Canon EOS 700D

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88 visits

increasing number of exposures

increasing number of exposures
A single exposure with f=750 mm, f/5,0 T=15 sec and ISO 3200
1 exposure, 10 exposures combined and 50 exposures combined are treated in Photoshop similar. Combining exposures is done with freeware Deepskystacker or with Photoshop.

Note the lowering of the noise when you combine more exposures. Theoreticaly it lowers by a factor SQRT(N) where N is the number of exposures combined

But also note the systematic errors caused by tracking errors (notably in the 10 exposure picture)

Erhard Bernstein, Klein-Bonsels, Nouchetdu38, Annemarie and 6 other people have particularly liked this photo

Comments
 tiabunna
tiabunna club
An interesting set and explanation, thanks Ko.
3 years ago.
 Fred Fouarge
Fred Fouarge club
kan ik van genieten
3 years ago.
 Annemarie
Annemarie club
A most beautiful image, have a nice weekend!
3 years ago.
 Klein-Bonsels
Klein-Bonsels
M33 @ it's finest
3 years ago.
Ko Hummel club has replied to Klein-Bonsels
M 101
3 years ago.

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