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Date: | 19 may 2004 (MYC-colors) and 20 may 2004 (b/w images) |
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CCD: | FTT1010-M (non-binned) |
Optical: | Prime focus 25cm Newton, f/D=5.7 |
Filters: | M,Y,C |
Exposure: | Each color 20x90sec. Luminance is sum of MYC-images and 32 images of 90 seconds without filters |
Processing: | Slightly unsharp masked |
From my location (The Netherlands), M51 is near Zenit and has been a frequently photographed object using the CCD-camera's and telecopes I have build. The images below present a short history of progress in technique and equipment. | ||
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May 1994 11cm Newton f/D=4.6 TC211 CCD 192x165 pixels Exposure: 8x60 sec |
April 1995 15cm Newton f/D=6.3 TC211 CCD 192x165 pixels Exposure: 6x50 sec |
June 1998 25cm Newton, f/D=5.7 FT800 CCD 300x390 pixels Exposure: 19x90 sec |
April 2001 25cm Newton, f/D=5.7 FT800 CCD 300x390 pixels Exposure: 24x120 sec |
May 2004 25cm Newton, f/D=5.7 MYC-color filter wheel FTT1010-M CCD 1024x1024 pixels Each color: 20x90sec Luminance: 32x90sec |