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Pentax DA 40mm and 70mm Limited lens review, tested with Pentax K10D Gordon Laing, April 2007

Outdoor
/ Resolution / Corner sharpness / Fringe and macro / Geometry / Vignetting

Pentax DA 40 and 70mm lens corner sharpness, tested with Pentax K10D

  To measure corner sharpness we photographed the Enhanced Digital Camera Resolution Chart with each lens using a Pentax K10D. The K10D was set to its best quality JPEG 10M *** mode.

Each lens was tested with various apertures selected in Aperture Priority mode; the DA 18-55mm was tested at both 18 and 55mm focal lengths. The crops are taken from the lower left corner of the chart and presented here at 100%.

In these tests of a chart photographed at fairly close range, neither the Pentax 40 nor 70mm lenses can be described as pin-sharp in the corners at wider apertures, but they're both much more impressive than the DA 18-55mm kit lens at 18mm - and their f2.8 and f2.4 maximum apertures are brighter than the f3.5 of the kit lens. The fairer comparison in terms of focal length though is with the kit lens zoomed-into 55mm. While its maximum aperture is only f5.6 at this focal length, it still performs impressively in the corners even with the aperture wide open. It's certainly one of the better kit lenses in this respect.

Pentax DA 18-55mm f3.5-5.6 AL
Pentax DA 40mm f2.8 Limited
Pentax DA 70mm f2.4 Limited
Pentax 18-55mm at 18mm f3.5
Pentax 18-55mm at 55mm - f3.5 not available
Pentax 40mm at f2.8
Pentax 70mm at f2.4
DA 18-55mm at 18mm f3.5
DA 18-55mm at 55mm
f3.5 not available
DA 40mm at f2.8
DA 70mm at f2.4
             
Pentax 18-55mm at 18mm f4
Pentax 18-55mm at 55mm - f4 not available
Pentax 40mm at f4
Pentax 70mm at f4
DA 18-55mm at 18mm f4
DA 18-55mm at 55mm
f4 not available
DA 40mm at f4
DA 70mm at f4
             
Pentax 18-55mm at 18mm f5.6
Pentax 18-55mm at 55mm f5.6
Pentax 40mm at f5.6
Pentax 70mm at f5.6
DA 18-55mm at 18mm f5.6
DA 18-55mm at 55mm f5.6
DA 40mm at f5.6
DA 70mm at f5.6
             
Pentax 18-55mm at 18mm f8
Pentax 18-55mm at 55mm f8
Pentax 40mm at f8
Pentax 70mm at f8
DA 18-55mm at 18mm f8
DA 18-55mm at 55mm f8
DA 40mm at f8
DA 70mm at f8
             
Pentax 18-55mm at 18mm f16
Pentax 18-55mm at 55mm f16
Pentax 40mm at f16
Pentax 70mm at f16
DA 18-55mm at 18mm f16
DA 18-55mm at 55mm f16
DA 40mm at f16
DA 70mm at f16
             

Pentax DA 40 and 70mm lens results continued...

Outdoor / Resolution / Corner sharpness / Fringe and macro / Geometry / Vignetting
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