It was a lovely clear night. I decided to get more data for NGC6781, to combine it with the subs I got earlier, plus some darks. I also aimed to get images of Brocchi's Cluster and M32 (using the ST80). As it was so clear, I ended up adding NGC147 and M33!
In processing order:
M33. I took these using iso3200 because I had a feeling the images wouldn't have enough data for DSS. I was right, so I had to convert the .nef into .dng and increase the exposure in Lightroom. Then, I tried processing the exported .tif files (didn't bother with darks since I still suspected the images wouldn't have enough data).
Nope.
M32: This was taken using the Skywatcher ST80, NOT the newtonian. The chromatic aberration is there, but not too bad; shows why achromats are cheaper than apo's. Shame the image wasn't centred!
After converting to .dng, cropping and then converting to .tif:
Brocchi's cluster = didn't have a wide enough field of view.
NGC 6781:
A definite improvement! Based on around 90 x 45 second exposures at iso1600, plus some darks.
However, the main conclusion is...I need to guide.
I have purchased a QHY5L-II Colour CCD/Guider. I decided to go for the less sensitive colour (over the mono) because I can then use it for moon/planet imaging as well. $200 from a chinese website, inc delivery. IF I don;t get stung for import then £60 cheaper than in UK!
In processing order:
M33. I took these using iso3200 because I had a feeling the images wouldn't have enough data for DSS. I was right, so I had to convert the .nef into .dng and increase the exposure in Lightroom. Then, I tried processing the exported .tif files (didn't bother with darks since I still suspected the images wouldn't have enough data).
Nope.
M32: This was taken using the Skywatcher ST80, NOT the newtonian. The chromatic aberration is there, but not too bad; shows why achromats are cheaper than apo's. Shame the image wasn't centred!
After converting to .dng, cropping and then converting to .tif:
Brocchi's cluster = didn't have a wide enough field of view.
NGC 6781:
A definite improvement! Based on around 90 x 45 second exposures at iso1600, plus some darks.
However, the main conclusion is...I need to guide.
I have purchased a QHY5L-II Colour CCD/Guider. I decided to go for the less sensitive colour (over the mono) because I can then use it for moon/planet imaging as well. $200 from a chinese website, inc delivery. IF I don;t get stung for import then £60 cheaper than in UK!
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