Quote:
Originally Posted by glend
Doesn't the filter act to push the focus further away from the camera sensor so to reach precise focus you need to add backspacing, using the Rule of One Third. So 3mm of filter thickness, or combinations of filter, cover glass etc that add up to 3mm, require an addition of 1mm of focal distance, thus adding to the backspacing by 1mm. I have been using this rule for years.
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Click here and see Backfocus adjustment with filters. It says -1mm. Maybe I am reading it incorrectly.
