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Owner reviews: Vivitar 28-105 mm f/ 3.5-4.5
well-built lens; good sharpness and colors; nice macro goes to 1:5
tends to have some zoom creep; somewhat heavy; does not have auto aperture
I used the Pentax version w/ Ricoh pin (which is rounded type which does not get stuck on Pentax K mount)
Liked the lens, but never use it since I got a Pentax DA 18-135