I had the opportunity of trying the Sharpstar astrograph (150mm F2.8), thanks a lot
@Matthieu TESSON who is waiting to get an adequate mount to use it
This is not really its firts light
@Andreas Zeinert may have use it in the past ;-)
At F2.8, I could have spent more time on the colimation but I did a minimum in order to try a wide field view : NGC7000
Ha : 30x5mn
RGB : 20x20x20 x1mn
Oiii : 1x5mn
Sii: 1x5mn
Initially I wanted to go for a Ha-RGB composition but I was not happy with the "flatish-red" rendering of the image.
At the end of the session I tried one subs in Oiii and one in Sii and the signal was good !
So with a lot of noise reduction on these unitary subs, I tried a SHO composition, keeping the RGB for the stars, I was surprised to be able to achieve a SHO compositio with so little acquisition in Oiii and Sii.
Of course, only the Ha was used for the luminance (same luminance on both version)
I leave the Ha-RGB version for the comparison but I prefer the SHO wich enhances greatly some part of the nebula from my point of view
Thanks again
@Matthieu TESSON to give me this wide field opportunity !
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