m13 from Rome - work in progress

[pk825]

Here is a first elaboration of m13 from my balcony in Rome. I take the subs in three days with an average SQM of 18.2 and about three hours of integration, but I'm not really satisfy of the result. I know that is not possible to obtain great image from a very light polluted city, but I think is possible to achieve better photo.

My setup is:

• Skywatcher Quattro 10'' f/4
• NEQ6 Pro
• QHY8L
• Lacerta off axis guide with QHY5L II color
• Baader UHC-S filter
• PHDguiding 2, Astrotortilla, APT and Pixinsight

I take 48 subs of 240 seconds in three days, with 67 darks, 21 flats and 51 biases.

Here are two version of the image:

lesser saturation and stretch

It is possible to see an hires version: 

http://www.astrobin.com/126942/C/

http://www.astrobin.com/126942/B/

 

Any suggestion is welcome.