Hello,
still bright sky at this moment. but 10s exposures and autoguiding enhanced the result.
To be compared to the same one with the asi120MM:
http://zwoug.org/viewtopic.php?f=22&t=1965
The colour ASI224 competes the monochrome ASI120.
The cluster could be substantially larger under a dark sky. I was in suburbs.
Nicolas
m13_2015-07-10_newton254_asi224mc_80p.jpg