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Sigma AF 30mm f/1.4 EX DC (Pentax K) Review / Test Report - Sample Images & Verdict |
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Lens Reviews -
Pentax
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Page 3 of 3
Sample Images
Here're some quick'n dirty sample images taken with the K10D and RAW-converted via ACR 3.7.
Click on a thumbnail to view the original file (opens in a separate window). Please note that the originals are FULL SIZE
(=several megabytes) which requires quite some bandwidth for downloading so please don't waste the limited resources here.
| Make |
PENTAX Corporation |
|
| Model |
PENTAX K10D |
| ISO Speed |
200 |
| Focal Length |
30.0mm
|
| Exposure Data: |
f/1.4 @ 1/640s |
| Size |
3872x2592 |
|
| Make |
PENTAX Corporation |
|
| Model |
PENTAX K10D |
| ISO Speed |
200 |
| Focal Length |
30.0mm
|
| Exposure Data: |
f/1.4 @ 1/4000s |
| Size |
2592x3872 |
|
| Make |
PENTAX Corporation |
|
| Model |
PENTAX K10D |
| ISO Speed |
200 |
| Focal Length |
30.0mm
|
| Exposure Data: |
f/10.0 @ 1/250s |
| Size |
2592x3872 |
|
| Make |
PENTAX Corporation |
|
| Model |
PENTAX K10D |
| ISO Speed |
200 |
| Focal Length |
30.0mm
|
| Exposure Data: |
f/1.4 @ 1/1600s |
| Size |
2592x3872 |
|
| Make |
PENTAX Corporation |
|
| Model |
PENTAX K10D |
| ISO Speed |
100 |
| Focal Length |
30.0mm
|
| Exposure Data: |
f/10.0 @ 1/200s |
| Size |
2592x3872 |
|
| Make |
PENTAX Corporation |
|
| Model |
PENTAX K10D |
| ISO Speed |
100 |
| Focal Length |
30.0mm
|
| Exposure Data: |
f/1.4 @ 1/3200s |
| Size |
3872x2592 |
|
| Make |
PENTAX Corporation |
|
| Model |
PENTAX K10D |
| ISO Speed |
100 |
| Focal Length |
30.0mm
|
| Exposure Data: |
f/1.4 @ 1/4000s |
| Size |
3872x2592 |
|
Verdict
The Sigma AF 30mm f/1.4 EX DC is a lens with a mission - to achieve the highest
center resolution there is without caring too much about the rest. The border
performance of the Sigma is soso at f/1.4 and only good beyond, the vignetting
is high at large apertures and neither CAs nor distortions are overly impressive
for a fix-focal length lens.
A quite strange design priority but there're applications for this. This is a pretty
interesting lens if you want to isolate a (near-centered) object from the rest of the
scene using an ultra-large aperture setting. The quality of the bokeh (out-of-focus
blur) depends somewhat on the background/foreground structure - it can look "smeary"
close to the image borders if the scene is a bit nervous. This is probably a side effect
of the low resolution here. In coarse structured scenes the bokeh can be quite smooth
and buttery though.
Can you use this lens for general purpose photography ? Well, naturally you can but
at comparable apertures any good standard zooms can produce a more even resolution
distribution across the frame specifically in the extreme corners.
So did it beat the real thing (Pentax SMC FA 31mm f/1.9 Limited) ? No, it did not.
| Optical Quality: |  |
| Mechanical Quality: |  |
| Price/Performance: |  |
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