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Hi Paul,
First thing to test, is your subs length. I cant use more than 5 minutes maximum because i get blooming on the brighter stars. But then again i have a 20" mirror pushing the photons. Just do a test on a moderatly bright (3rd or 4th mag star) by taking a 5 and 10 minute sub and check for blooming.
The 8300 does have lower blue and red response, green is the highest response, so you may want to increase your blue/red subs by 50 %.
I have attached the QE of the 8300 for you to have a peek at.
Theo.
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