Pentax DA 40mm and 70mm Limited lens review, tested with Pentax K10D - Pentax DA 40 and 70mm lens geometry, tested with Pentax K10D

Pentax DA 40 and 70mm lens geometry, tested with Pentax K10D


Pentax DA 40 and 70mm lens results continued…

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

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To measure geometric distortion we photographed a test chart consisting of a grid pattern with perfectly straight lines. The lenses were tested with their apertures set to f8 using a Pentax K10D in Aperture Priority mode; the DA 18-55mm was tested at both 18 and 55mm focal lengths. The images were analysed with Imatest using 5th Order line calculation and the full areas presented here at a reduced resolution.

As you’d hope for higher quality fixed focal length short telephoto lenses, the 40 and 70mm Limited editions exhibit relatively low geometric distortion. Interestingly the 40mm exhibits slight barrelling, whereas the 70mm exhibits the more usual pincushion distortion associated with this kind of focal length. The 70mm suffers from the least distortion here.

Pentax DA 18-55mm f3.5-5.6 AL
Pentax DA 40mm f2.8 Limited
Pentax DA 70mm f2.4 Limited
Pentax 18-55mm geometry at 18mm f8
Pentax 18-55mm geometry at 55mm f8
Pentax 40mm geometry at 40mm f8
Pentax 70mm geometry at 70mm f8
DA 18-55mm at 18mm f8
Distortion: 2.76% barrel
DA 18-55mm at 55mm f8
Distortion: 0.58% pincushion
DA 40mm at f8
Distortion: 0.71% barrel
DA 70mm at f8
Distortion: 0.42% pincushion
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