Sigma AF 30mm f/1.4 EX DC (Pentax K) Review / Test Report - Sample Images & Verdict
Lens Reviews - Pentax

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:



© by photozone.de