Comparing
lenses: 85mm to 100mm
(JPEG)
Comparing
lenses: 200mm
(JPEG)
-
UPDATED 18 JUNE 2004 -
Details below are
shown at 100% scale. If seen on a 17" computer screen, the complete picture would be
90x60cm. Focusing was done on the roof ridge at center.
Two comments
about the Pentax F-series 70-210mm:
1 - Despite repeated operation, at 210mm the lens always focuses closer than
the subject. For this reason, the picture looks worse at center and on the
right, while on the left (where the rooftop is halfway between the camera
and the focused subject) details are better than those produced by the other
two lenses, which are out of focus (as they should be).
2 - At full aperture (f/5.6) lens speed is around half a stop slower than
claimed, so that its performance changes very little between f/5.6 and f/8.
About the
Sigma 70-200mm f/2.8 EX, it must be noticed that it is a bit slower than
claimed at all apertures, so that it is better you overexpose between 1/3
and 1/2 EV, as I did in this test.
About the old
screw mount Takumar, you may only see how well it matches digital
photography!
| Center |
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Sigma EX 70-200mm at 200mm f/2.8
|
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Takumar 200mm f3.5 (pre-set) at f/4
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SMC Pentax-F 70-210mm at 210mm f/5.6
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Sigma EX 70-200mm at 200mm f/4
|
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Takumar 200mm f3.5 (pre-set) at f/8
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SMC Pentax-F 70-210mm at 210mm f/8
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Sigma EX 70-200mm at 200mm f/8
|
| Left |
|
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Sigma EX 70-200mm at 200mm f/2.8
|
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Takumar 200mm f3.5 (pre-set) at f/4
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SMC Pentax-F 70-210mm at 210mm f/5.6
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Sigma EX 70-200mm at 200mm f/4
|
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Takumar 200mm f3.5 (pre-set) at f/8
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SMC Pentax-F 70-210mm at 210mm f/8
|
Sigma EX 70-200mm at 200mm f/8
|
| Right |
|
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Sigma EX 70-200mm at 200mm f/2.8
|
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Takumar 200mm f3.5 (pre-set) at f/4
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SMC Pentax-F 70-210mm at 210mm f/5.6
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Sigma EX 70-200mm at 200mm f/4
|
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Takumar 200mm f3.5 (pre-set) at f/8
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SMC Pentax-F 70-210mm at 210mm f/8
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Sigma EX 70-200mm at 200mm f/8
|
In my opinion, pictures
above are very interesting, showing how modern lenses aren't necessarily
better than older ones for digital photography. The same goes with
expensive lenses compared to cheap ones.
Unless
stated otherwise, all published shots are original and untouched. Since
image quality depends a lot on the lens used, these samples are valid for
mentioned camera+lens combination only, and don't necessarily reflect
general image quality obtainable with a given camera.
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