Vivitar TX 35mm f2.8

      My copy of this lens was made by Tokina.  I used a Minolta TX mount to test this lens on my Eos M3.  This lens surprised me.  I expected it to be sharp at f8 w/ lots of Chroma.  I was wrong.  This old lens is sharp enough at f2.8 and it is sharp up to f11.  The whole frame tightens up nicely as you climb through the f-stops.  Fringing is barely noticeable at 100% crop.  I did not test flare yet.  Colors are a natural.  Contrast is consistent thru the entire aperture range.  Bokeh is a tad rough above f2.8.  At f4 and up highlights form hexagons and circles.  The focus throw on this lens is very long.  It's a long tedious turn from 3 ft to infinity.  It is difficult to focus handheld.  Even on the Eos M3 with the image magnified I was unsure of focus.  Focus is heavily dampened, but it might need a lube.