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Sigma EX DF 28-70mm F2.8 | | Latest Review Posted | Sigma EX DF 28-70mm F2.8
I bought the DF (means dual focus apparently - since it has a ring to disengage the AF like the Tamron 90) version of this lens in August 2009 as part of a run out deal (the store had bought up all the remaining copies in Australia)
This is late film era lens from about 2002-2003 and as a result a bit heavy (645g) - but if the mythical FF Pentax dSLR arrives it will have a home (I know a guy with an MZ that bought one and loves it). However, it has a constant f2.8 aperture at all zoom focal lengths, and that big chunk of glass at the front means it focuses quite fast.
There were good reviews of it around the web, and a few mixed in here with its younger sibling the DG version (lighter and smaller).
Its also very solidly built (NOTE: see the update of the update at the end of this review) - the zoom and focus rings feel tight and smooth. Its a pleasure to use. The filter diameter is 77mm - the same as my Sigma 10-20mm f4. Watch out for the lens hood though - the 28-70mm hood will cause grief on your 10-20mm as its longer.
Having used it extensively for a month whilst on holiday I can say that IQ is very good to excellent. There is no discernable CA or vignetting in my experience. It can be little soft at full aperture, but from f4 up its sharp. Its not too bad at f2.8 though - no worse than any other zoom.
Colour and contrast are good - it needs very little PP to get well balanced images.
Bokeh is smooth and pleasing as you can clearly see in here
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