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Hi Stephen,
A bahtinov mask is used to achieve true focus for imaging as the camera sensor does not have an adaptive lense like your eye. Yes it will get the focus close but you will still have to make adjustments for your particular eyes. I personally have pretty bad eyes. If I focus with my bahtinov mask for imaging, visually I see nothing but blur. It it true however that a bahtinov is used to achieve infinite focus and as such once you are focused on anything in space, everything is in focus. I hope this clarifies things a little.
Cheers
Ryan
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