Ngc 3576 & ngc 3603

[jsmoraes]

GSO 305 mm - Canon Rebel XT - ISO 400 - 1 h e 6 m - 33 x 2 min - OAG - DSI1 - Coma Cor.

NGC 3576 and NGC 3603

large scale:
http://cdn.astrobin.com/images/097ae7a3-c9dc-4345-a2bb-11312aa29351.jpg

NGC 3576

large scale:
http://cdn.astrobin.com/images/be05009e-e0ac-480d-a3d0-88a28f82b0ff.jpg

NGC 3603

large scale:
http://cdn.astrobin.com/images/1475c015-8d7b-484f-914f-240d0285769d.jpg

[jsmoraes]

NGC 3576 & NGC 3603 - wide view

http://cdn.astrobin.com/images/012936b8-2e80-4ae1-8725-28dafe309ab1.jpg

[Ross G]

Nice shots Jorge, but 2 min exposures?...what happened to your 10 minute exposures?

Ross.

[jsmoraes]

Thank you, Ross. I have two limits that drive my captures.
1) light pollution. I have not filters to Canon
2) RGB saturation of stars

And, I have lamp of street that illuminates the interior of my OTA. :sadeyes:

High ISO with long time, I must deal with sky glow
High ISO with short exposure, I must deal with saturation
Low ISO with long time, I must deal with noise
Low ISO with short time, it is trash

It seems that to nebula, the best result is with ISO 400 or 800, but with short time.
To stars and cluster, ISO 100 or 200 and long time.
Galaxies and faint object, I didn't test yet.

At moment, I am using the information of histogram to pollution. And intuition to RGB saturation. :D

[Larryp]

Nice work, Jorge!