Quote:
Originally Posted by xelasnave
Hi Martin I followed your approach but I could not help going for 3x drizzle ..colour is different I think ...actually I am too tired to think  ..but I do like this one on my screen ..goodness knows how it will look here..
it went a bit red and I could not get rid of it in startools but subdued it in photoshop a little  .
Martin thanks for all your help and guidance I greatly appreciate all you do for me   .
alex
Addition via Edit...I forgot to bin...so another go and 2x drizzle and I can bin 50% |
Alex,
Drizzle only provides benefit for undersampled data where your image scale is greater than say 1.20 arc sec per pixel
Your 115 scope at native focal length of 800mm and your 2600MC is oversampled ( 0.90 arc sec per pixel ) so Drizzle will be detrimental not advantageous. Even with a focal reducer to reduce your fl to 700mm your still oversampled
Drizzle is designed to work with undersampled data ( short focal length scopes say 200 to 400mm fl ) , lots of data and data that is well dithered
One of the negative affect of Drizzle is that it injects a lot of noise in images if not sampled correctly
Drizzle and Binning doesn’t make sense in Startools ( Binning trades off a bit resolution for noise reduction and Drizzle adds noise in regard to oversampled data )
With “oversampled data” your best to do a basic Stack in DSS ( no Drizzle ) then in Startools use Binning ( I use the slider to trial the best Bin setting ) to improve your SNR and then if you want a sharper image particularly with the main structures of your object , use Sharpening and then SV Decon Spatial Variant Deconvolution ( ST version 1.8 ) this new module greatly reduces atmospheric blurring of your image and at the same time tightens your stars to pin points ( It’s taken me a few hours to learn it I’ve got it working really good now )
Cheers
Martin