Nice widely separarted double(-double) star – good starting point for a new little "sport" project, which, I hope, would culminate in splitting Sirius A and B. Well, this system is a challenge by itself – both ε1 and ε2 are not resolved as doubles here.
Well, I was going too boldly. With pixel scale of 1,18" and blobish stars with average diameter of 11 pixels it is not a good idea to split pairs separated less than 2,5" each. Time for the Barlow lens!
Aquisition time: 02.05.2013 02:05 MSK (GMT +4).
Canon EOS 60D on Celestron Omni XLT 150 mm Newtonian mounted on Celestron CG-4 German equatorial mount with RA drive.
Aperture 150 mm
Focal length 750 mm
Tv = 25 seconds
Av = f/5
ISO 3200, 2000, 1600, 1000, 400
Exposures: 6 (2@2000 and by 1 on all othe ISO values)
Processing: all images were converted to 16 bit TIFF and processed with Deep Sky Stacker. Resulted image was cropped to 2048×2048 pix and contrasted in Photoshop.