M 45

M 45 – Pleiades

11.08.2010 03:00 to 11.08.2010 04:00
12.08.2010 03:30 to 12.08.2010 04:00

Az./Alt. positions: 83° / 29° to 94° / 41° 
Ambient conditions: 18°C, transparency 3 to 5/5, seeing 4 to 5/5,
Location: Tatti, Tuscany, Italy

Telescope: Deltagraph 300mm f/3.3
Mount: CGE
Camera: SXVF-M25C
Guiding scope: Orion short tube 80mm f/5
Guiding camera: ATIK 16IC
Filters: no

Software: Maxim DL 5
FOV, Image scale: 62.5 x 54.8 arcmin, 1.62 arcs/pixel
Sub-exposures: 44min (22 x 2min) light frames
No darks, 100 bias, 50x0.2s flats

Images Plus 3.75: Calibration of light frames with bias and flats, DDP
Maxim DL: Stacking of calibrated frames with SDMask
CS3: curves and levels, color balance, GradientXterminator, Carbonis Actions, color enhancement using Gabany method

This is a test object shot at the end of the night, when the Pleiades was still too low
on horizon. Only 44min total exposure is not enough. CGE is at its limit with the 25kg
heavy Deltagraph: setup very wind sensitive. In order to achieve a flat field by applying flats
one needs to calibrate the light frames with darks or bias, otherwise a srong radial
color gradient will appear.

Download full size image:

Filename: clusters/m45_2010-08-11_full.jpg
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