by Jean-Christophe Meriaux, San Bruno, CA
Date: 8/9/2010 – San Bruno, California – near the SFO airport skylight dome...
Modified Canon XTi and Astronomik CLS CCD filter to (try) to beat the light pollution!
Seeing: 3/6 – Wind between 5mph and 10mph
Mount: Astrotrac travel system
Camera: Modified Canon XTi (Standard IR filter replaced with an astrodon IR filter by Hap Griffin) with Canon 200mm f/d 2.8 teleobjective (prime lens) opened at f/d 3.5 – at Iso 400.
22 exposures of 90 seconds with Astronomik CLS CCD clip filter, 10 flats frames, 10 darks, 10 biais.
Processing:
MaximDL5: darks and flats subtraction, alignment and averaging
Photoshop CS4: stretching, selective sharpening
Noise Ninja: noise removal
I used a Bahtinov mask as a focus help on a bright star (Antares).
More information on my blog http://messier42.us