Deep Sky Photography with digital cameras

CCD Astrophotography by Jürgen Stein

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M57 (Ring Nebula)

M57 (Ring Nebula)

Image orientation: North is on top.

Exposure Data:

Date: 19.+20.+21.+27.7.2013
Telescope: Newtonian with ASA Reducer 250mm @ f/3.6 on Mesu Mount 200
Camera: MI G2-8300FW @ -25°C.
Exposure: LRGB with L = Hα + L, R = Hα+R, G= OIII+G, B=OIII+B. Hα = 3x600s+39x900s, OIII=14x300s, L=8x600s, RGB=9/9/11x300s. No binning. Total exposure time 15h10m
Location: Rhein-Main area, Germany. Sky brightness about 19.5-20.1 mag/arcsec^2
Note: Guided with MI G0-0300 guider on Lacerta OAG.
Processing: Maxim DL, Pixinsight, Photoshop CS3