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Pentax SMC-FA* 300mm f/4.5 ED [IF] - Review / Lab Test Report - Analysis |
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Lens Reviews -
Pentax
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Page 2 of 2
Distortions
The level of distortions (0.07%) is only detectable in a lab environment and
not field-relevant.
The chart above has a real-world size of about 120x80cm.
Vignetting
As a full format lens the FA* 300mm f/4.5 enjoys a sweet spot advantage on the K10D
and vignetting is basically a non-issue here even at wide-open aperture.
MTF (resolution)
The FA* 300mm f/4.5 produced pretty impressive MTF figures just like you
would expect it from a professional grade fix-focal (this applies to the 2nd sample).
The resolution is generally very good to excellent from f/4.5 all the way up to f/11.
Below is a simplified summary of the formal findings. The chart shows in line widths
per picture height (LW/PH) which can be taken as a measure for sharpness.
The chart is limited to the visually relevant LW/PH range of [850, 2350].
If you want to know more about the MTF50 figures you may check out the corresponding
Imatest Explanations.
Please note that the results are only comparable within the Pentax lens test group!.
Chromatic Aberrations (CAs)
Lateral chromatic aberrations (color shadows at harsh contrast transitions) are
low and generally not field relevant at all tested aperture settings.
Verdict
The Pentax SMC FA* 300mm f/4.5 ED [IF] showed a very solid performance in all
tested characteristics. The resolution is generally very good to excellent.
Distortions, vignetting as well as CAs are very low and not field relevant.
The build quality is excellent and the AF speed is very high. Interestingly
Pentax decided to stick to an unusually slow max. aperture of f/4.5 vs the
f/4 mainstream. You may debate this decision but as a positive side effect
the FA* 300mm f/4.5 is comparatively compact and light-weight.
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