Yes a CLS filter will help, I use on an it has been one of my best purchases. Difficult when it's really hot as the longer you camera is on the worse the noise will be. You have to play around to get the best setting. Going to a really high ISO . will give you noise no matter what. I would be shooting at around 400 to 800 dependent on your scope f: ratio. Make sure you use the LCD display as little as poss as this will increase the operation tems of the camera.
Mardy
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