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Bert I agree with everything you say apart from the focusing method. Im with rally on that one focusing with a bat mask while great for people who do not have electronic focus is reliant on your eyes picking a very very fine point is madness. I focus by numbers by hand and it takes me but a few minutes to do though maximdl.
I don't have as fast of a system at you with mine being F4.7 but my CFZ is only 42 ish micron. Sure the bat mask gets it close but when you have spent in the order of 10s of thousands of dollars (what you spent close to 5k on filters alone) why are you using a 20 dollar focusing tool?
You may just be surprised at how easy focus is once you have the right software!
A friend i image with focus's approximately every 30 minutes and it takes about a minute to do it. further more its written into the autosave so it doesn't even move off target. just click go it picks its own star, does its own focus then goes on its merry way of imaging.
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