photo:sigma150mmf2.8macro
Sigma 150mm f/2.8 EX DG HSM APO macro lens
introduction
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beautiful optics - sharp wide open, low distortion, nice bokeh but slow AF - slower than the Olympus ZD 50mm f/2.0 macro lens
on many cameras, many models appear to have front-focus AF error issues requiring microadjustment to give sharp AF images.
specs
150mm f/2.8
as with most macro lenses with internal focusing (IF), the lens looses between 1.5 to 2 f-stops in speed and the focal length reduces when set to the min. focus distance!
closest focus 38cm giving 1:1 macro and 7.6“ working distance
detachable tripod collar
barrel-type lens hood
72mm filter
AF-MF switch (when used with Four Thirds cameras this must be set to the same settings as the camera settings)
focus limiter: 0.38-0.52m; 0.52m-infinity; and full range
HSM AF allows manual focus in AF
16 elements in 12 groups including APO
80mm wide x 137mm long
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compatible with the two Sigma AF converters (1.4x, 2x)
reviews
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0.08% distortion
0.5EV vignetting wide open at infinity reducing to 0.17EV at 1:1 macro
sharpest at f/5.6 but very sharp wide open
minimal CA of 0.23px
BUT “the sample lens suffered from a rather extreme degree of decentering which pollutes the resolution potential of the lens (on the left image side) - a rather worrysome quality control issue.”
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photo/sigma150mmf2.8macro.txt · Last modified: 2014/07/07 13:20 by gary1