If you don't know what you're talking about, don't review products, especially if you claim to have a high level of tech knowledge. Earwigy's criticism that the "depth of field is pretty bad" is a ludicrous statement. Without picking hairs, all f/1.4 lenses will have the same depth of field.

Relatively inexpensive, extremely fast prime; Autofocus is internal, pretty fast, and quiet; A little soft wide open, but sharpens up quickly as you stop down; Nice bokeh

A little soft wide open; If you upgrade to full frame, the lens is usless

Ett bra objektiv om man vill fota mycket i dåliga ljusförhållanden och klarar sig med en brännvidd på 30 mm.

Mycket ljusstarkt (F1,4; Ger bra kvalité i alla ljusförhållanden så man slipper dra upp ISO; Kompakt och litet objektiv med gedigen konstruktion; Personligen föredrar jag att fota med min Sigma 30 mm än tex Canon Ef 50 F/1,8; inte bara för att det är ljusstarkare utan gör att jag finner att 30 mm är

Fast brännvidd; något vissa kan tycka är jobbigt; Svårt att autofokusera i svagt ljus; man måste hitta en ljuspunkt att fokusera på; Brus i höga ISO

Perfect lens if it focused properly out of the box. Lens has a little front focus on my Rebel t3i. Sent to Sigma for calibration with camera body still waiting for it to return. Otherwise good quality lens.

The 30mm f/1.4 DC HSM Art is another solid entry in Sigma's prestige lens line-not the finest glass the company has to offer, but a marked improvement over the older (if cheaper) 30mm f/1.4.

The Sigma 30mm f/1.4 DC HSM A is a wide-aperture standard lens for APS-C cameras

F/1.4 maximum aperture; Excellent MTF results; Full-time MF option; Near-silent AF; Metal mounting flange

Significant barrel distortion; Some colour fringing; No image stabilisation

Designed exclusively for DSLR cameras with 'APS-C' sized image sensors, Sigma's 30mm F1.4 EX DC HSM lens is solidly constructed and available in mounts to suit all popular brands – including Olympus and Panasonic.

The Sigma 30mm F1.4 DC HSM "Art" is a fast prime lens designed exclusively for APS-C DSLRs; it's of particular interest to us because its "normal" field of view corresponds roughly to that of a 50mm lens on a film camera.

Fast F1.4 maximum aperture; Convenient focal length on APS-C; Beautiful bokeh; Excellent center sharpness; Compact and easy to hold; Minimal vignetting at F2 and above; Resistant to flare and ghosting; 4-year warranty (USA; Very affordable

More distortion that we'd like to see in a premium prime; Purple fringing near edges/corners; Low contrast wide-open; Somewhat heavy given its size; Average corner sharpness; Not weather-sealed; Sluggish autofocus

This is a great lens, lets get that out there. Someone mentioned that it is a photographer's lens, and I agree wholeheartedly. This lens is PERFECT for indoor shooting, people shots, and as a general walk around lens.

Sharpness where it counts, light weight (this is relative), focusing accuracy on my copy, and great bokeh; If you get a good copy you will love it

None worth complaining about; it vignettes (correctable and typical for this type of lens); has some CAs (shoot RAW if you care about it); and people complain about corner sharpness; but if you are trying to get corner sharpness at f/1.4 your probably just shooting brick walls and test charts

This is a fantastic lens! Since I have had it it hasn't came off my body!

Despite the naming similarity, there is a world of difference between Sigma's 35mm f/1.4 and its 30mm f/1.4 (reviewed here). Whereas the former is a full-frame lens, the latter is APS-C only; whereas the former has a petal-shape lens hood, the latter's is cylindrical; whereas the former offers...

F/1.4 maximum aperture; Excellent MTF results; Full-time MF option; Near-silent AF; Metal mounting flange

Significant barrel distortion; Some colour fringing; No image stabilisation