All Sky Camera in H-alpha
Göte Flodqvist, Sweden

 


Gote F2 V2.jpg (37707 bytes)

 

P1200626 crop.jpg (28397 bytes)

 

 

The optical principle is long established. One problem is to find suitable lenses for the secondary and tertiery positions, without spending a fortune. The diaphragm of the relay lens (secondary) could be an issue (position, size). I was lucky to find two usable lenses in my optical "junkbox".

 

 

Hochtor ASC Halpha 4886.jpg (47918 bytes)

North is up, east is left. The lightpollution from the Heiligenblut valley is obvious, due south. Mountainridges fill the horizons.

 
Primary lens:
   Fish-eye, Sigma 8 mm / 3,5
Secondary lens:
   Relay lens, Rodenstock XR Heligon 75 mm / 1,1 (a trashed medical X-ray machine)
Filter:
   H-alpha 2”, FWHM 7 nm
Tertiary lens:
   Modified Minolta MC Rokkor 85/1,7. Stopped down to F/5,6
Camera:
   Canon 6Da
Exposure:
   Stacked 6 x 4 min @ ISO6400
Site:
   Hochtor/Grossglockner Hochalpenstrasse in Austria. Elevation 2500 m
Date:
   2021-07-09

 

 

 

 
Pilekulla.jpg (25185 bytes)

 

North is up, east is left. The "lightpollution" due west is Zodiacallight and some contribution
from a nearby village, Degerhamn. Light from the city of Kalmar in the north (35 km).

 
Primary lens:
   Fish-eye, Sigma 8 mm / 3,5
Secondary lens:
   Relay lens, Rodenstock XR Heligon 75 mm / 1,1 (a trashed medical X-ray machine)
Filter:
   H-alpha 2”, FWHM 7 nm
Tertiary lens:
   Modified Minolta MC Rokkor 85/1,7. Stopped down to F/5,6
Camera:
   Canon 6Da
Exposure:
   Stacked 6 x 4 min @ ISO6400
Site:
   A dark site on the southern island of Öland, Sweden
Date:
   2022-03-05