I have the 28mm f2.0 version. I heard its corner sharpness sucks on FF, but the center sharpness is decent. M43 gets the goody sharp center area. Nokton 25mm is sharper, but this Vivitar lens can be used on other mirrorless mount systems.
Just got the vivitar 55mm 2.8 by mistake..i won an auction on ebay for vivitar 28-50mm to use it with my isco 36, but the guy sent me the 55m macro instead..the 55mm vivitar macro ,im loving this mistake ..its a great lens, unlike the 28mm, its sharp wide open at 2.8, and can focus much closer
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