Nebula region aroun...
 
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Nebula region around the star Sadr in the constellation Cygnus  

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(@stefan-b)
White Dwarf Customer
Joined: 4 years ago
Posts: 22
August 7, 2019 22:34  

My image of the nebula region around the star Sadr in the constellation Cygnus. The pictures were taken on four nights with a TS-Photoline APO 360mm, using a UHC clip filter for my EOS 750Da. The total exposure time is 6 hours, which consists of 60s and 180s lights.

I hope you like it 😉 

Clear skies, Stefan

Sadr ISO 800 EXP 22587s F UHC Photoline 60 360mm EOS 750Da LR

 


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(@vincent-mod)
Universe Admin
Joined: 4 years ago
Posts: 3694
August 8, 2019 10:05  

Yes, lots of details. I'm missing a bit of color though, this filter shouldn't supress too much color right?


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(@stefan-b)
White Dwarf Customer
Joined: 4 years ago
Posts: 22
August 8, 2019 13:10  
I am quite satisfied with the result. It was the first time I used a UHC filter, so I can't judge yet if the filter suppresses the colors a bit. But that shouldn't be based on the filter's transmission curve.
The pictures were taken in July this year at a warm outside temperature. The chip temperature of my EOS 750Da was partly 29°C and the darks and flats of course have different temperatures. Of course this is not ideal for processing the pictures. This is the big disadvantage compared to a cooled CMOS camera.
 
Maybe I should have experimented more with APP, but I don't have enough experience yet.
 
 
Here are the technical data of the UHC filter:
  • 97% transmission at 486nm (H-beta)
  • 97% transmission at 496nm (OIII)
  • 97% transmission at 501nm (OIII)
  • 97% transmission at 656nm (H alpha)
  • Optimum transmission position for devices with f/10 to f/3.5
  • Passband: 480nm to 505nm and 645nm to over 700nm
  • Homofocal with all other Astronomik filters
  • Thickness of the filter: 1mm
  • Not sensitive to moisture, not aging, scratch-resistant
  • Fine-optically polished carrier material

 

Transmission curve Astronomic UHC clip filter

UHC Clip Filter Transmissions Kurve

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(@vincent-mod)
Universe Admin
Joined: 4 years ago
Posts: 3694
August 8, 2019 13:19  

Ah it blocks a decent amount, mainly for light polution purposes.

edit: no blue shouldn't be blocked. So interesting why that's not present here. Anyway, food for thought in a next attempt maybe. 😉 Could also be due to the exposure, if stars get saturated color is lost as well.


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