Holmes comet 134 days after the outburst and NGC 1499 California
March 5/6 was the first perfectly clear night after the period of bad weather. The total exposure
time of the image was 128 min and the F2.8 lens was stopped down to F4.5 because the Astronomik
CLS filter (48 mm diameter) was placed in front of the lens. The low sensitivity of unmodified Canon EOS 5D
in H-alpha requested long exposure on the other hand it was an advantage because it made the contrast between
mainly H-alpha emitting California nebula and the white solar light reflecting comet acceptable.
Click on the image or on the following reference to display the
higher resolution image version (3.0 MB, PNG format).
|Date||5. 3. 2008|
|Time||18:21 - 20:45 UT|
|Place||Near Brno-Komín, Czech Republic |
|Coordinate||N 49° 13.45', E 16° 32.98', Alt. 272 m|
|Optics||Canon 200mm 1:2.8 L II (aperture 4.5) + Astronomik CLS filter|
|Camera||Canon EOS 5D|
|Exposure||16× 8 min (ISO 1600)|
|Copyright||© 2008 Miloslav Druckmüller|