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Hey dave.
WRT - to astronomik filters and focus. Yes, they are pretty much parfocal. They're very close.
Funny enough, I found last night that the best way to go was to get the best focus on the blue channel and work from there.
The blue channel was the clearest of the three, which is not usually the case. The transparency wasn't too flash, which impacted the normally sharper red channel quite significantly.
Other times I get my focus on the red...the green looks good, and I need to 'tweak' the blue.
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