I have came across a three filter set in a photo shop's cut bin. The three
49mm magnifying filters were +1, +2, and +4 diopters.
Using the +4 filter on my Zuiko 50mm / 1.4 lens [in place of the usual UV
filter] the closest I could focus was about three inches from a flat two
dimensional object .... a business card.
Does anyone have any experience of these Vivitar filters and could opine on
the quality of any photos taken using them as compared say to using a Zuiko
50 mm / 3.5 macro?
I wonder what the photo performance would be using a +4 diopter filter with
a 135mm / 3.5 lens?
John Hudson
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