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Thursday, January 8, 2009

Firs light for QHY9 and 200mm f1.8 lens

ROSETTE NEBULA (target was only between 20-30 degrees above horizont)
Ha 12 x 5min = 1h, O-III 3x5min and S-II 3x5min

100% grob from Rosette nebula image
- HEART & SOUL H-alpha 12 x 5min. = 1h, O-III 3 x 5min and S-II 3x5min. Rosette in "natural color"
H & S in natural color
1h. 7nm H-alpha channel
1h 7nm H-alpha channe
After so many technical difficulties I managed to shot
first lights for QHY9 astro camera.
Everything worked smoothly with new ASCOM driver, MaximDL
and FocusMax.
This is real firs light for my new lens, Canon EF 200mm f1.8´, as well.
It was really an experience to shot with f1.8 optics.
Extreme fast optical conficuration and difraction limited lenses makes this lens
to a dream machine for astro imaging.
Pay attention to exposuretimes of the first light images.
Focusing at f1.8 is least difficult. The critical focus zone is only 7 microns =
I am using the TCF-s focuser and there is a temperature compensation build in.
I noticed, that about a half degree temperature drop is enough
to make focus soft. Without temp. compensation this lens must be focused
after every image.
Actual focusin is done by rotating the focusing ring of the lens by TCF-s focuser.
There is images about this system in R&D part of the pages.
With this lens and camera combo I can have both, wide field and high resolution.

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