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M4 and M22 with Telephoto lens
Subject: M4 and M44
Image Size: 1000 x 1000 (each half)
Image FOV: 37 minutes by 37 minutes (each half)
Image Scale: 2.22 arc-second/pixel (50% reduced)
Date: 2011/05/07 and 2011/05/08 (Processing backlog of old images)
Exposure: M4: 9 x 5 minutes, M22: 10 x 5 minutes, ISO1600, f/8
Camera: Unmodified Canon T2i/550D
Lens: Nikon 800mm f/5.6 AI-S, at f/8 (sharpest)
Mount: Astro-Physics AP900
Guiding: ST-402 autoguider through TV-102iis guidescope, Maxim DL autoguiding software
Processing: Raw conversion and calibration with ImagesPlus; Aligning and combining with Registar. Final processing in Photoshop -- levels adjustment, cropping to 2000 x 2000, 50% reduction to 1000 x 1000, combining two panels, JPEG conversion, etc.
Remarks: SQM-L reading start/end = 2156/21.61 (M4); 21.58/21.49 (M22)
The focus on M4 appears to be off, resulting in the fuzzy stars.
M4 and M22 with Telephoto lens
Subject: M4 and M44
Image Size: 1000 x 1000 (each half)
Image FOV: 37 minutes by 37 minutes (each half)
Image Scale: 2.22 arc-second/pixel (50% reduced)
Date: 2011/05/07 and 2011/05/08 (Processing backlog of old images)
Exposure: M4: 9 x 5 minutes, M22: 10 x 5 minutes, ISO1600, f/8
Camera: Unmodified Canon T2i/550D
Lens: Nikon 800mm f/5.6 AI-S, at f/8 (sharpest)
Mount: Astro-Physics AP900
Guiding: ST-402 autoguider through TV-102iis guidescope, Maxim DL autoguiding software
Processing: Raw conversion and calibration with ImagesPlus; Aligning and combining with Registar. Final processing in Photoshop -- levels adjustment, cropping to 2000 x 2000, 50% reduction to 1000 x 1000, combining two panels, JPEG conversion, etc.
Remarks: SQM-L reading start/end = 2156/21.61 (M4); 21.58/21.49 (M22)
The focus on M4 appears to be off, resulting in the fuzzy stars.