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Friday, February 15, 2008
Rosette nebula is located very low in the horizont at my location.
The maximum elevation is about 29 degree.
Last night I shooted one hour of exposures to RGB channels, with UHC-s
Hevay light pollution coused strong gradient and very weak signal/noise.
Then I shooted 9x1200s for H-alpha channel, but thin upper clouds ruined 5 exposures.
Final image is composed from 6x600s RGB and 4x1200s H-alpha.
This lens is fast enough to capture a nice amount of photons in that time,
not very deeb image but tolerable.
Here is pure H-alpha version: