Image 1 of 1
M51 Whirlpool Galaxy (130mm EOS Ra).jpg
Messier 51, the Whirlpool Galaxy, the classic face-on spiral galaxy in Canes Venatici in the northern spring sky.
This is a stack of 6 x 10-minute exposures with the Astro-Physics 130mm apochromatic refractor at f/6 (with the 6x7 Field Flattener) and with the Canon EOS Ra camera at ISO 800. As an experiment on this mild but still cool spring night I did not shoot dark frames or LENR in-camera darks to see the extent of thermal noise. There was quite a bit at the single pixel level, proving that the camera does need darks or LENR when the ambient temperature is warmer than a sub-zero winter night.
This is a stack of 6 x 10-minute exposures with the Astro-Physics 130mm apochromatic refractor at f/6 (with the 6x7 Field Flattener) and with the Canon EOS Ra camera at ISO 800. As an experiment on this mild but still cool spring night I did not shoot dark frames or LENR in-camera darks to see the extent of thermal noise. There was quite a bit at the single pixel level, proving that the camera does need darks or LENR when the ambient temperature is warmer than a sub-zero winter night.
- Copyright
- © 2020 Alan Dyer
- Image Size
- 6727x4485 / 4.2MB
- www.amazingsky.photoshelter.com
- Contained in galleries
- Galaxies, Messier Objects
