LensTip.com

Lens review

Sigma 30 mm f/1.4 EX DC HSM

18 August 2009
Arkadiusz Olech

5. Chromatic aberration



Please Support Us

The coronavirus crisis has been adversely affecting many businesses and, sad but true, ours is not an exception. Despite that difficult situation we would like to preserve continuity and high quality of publications available on all our websites. Still, we are now aware it might be impossible without additional financial help. That's why we would like to ask all those who visit, read, and care about Optyczne.pl, LensTip.com i Allbinos.com for support - it's enough you send us a small sum of money via PayPal. If a lot people decide to support our websites we think we'll stand a chance and survive next months without any lasting harm. We count on your support and understanding, stay safe and be healthy.

- - - - - - - - - - - - - - - - - advertisement - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Despite quite an advanced for a standard prime construction, designed for small sensors, and using low-dispersion elements, correcting chromatic aberrations doesn’t work well for Sigma.

Sigma 30 mm f/1.4 EX DC HSM - Chromatic aberration

Most of all, the level of this aberration doesn’t depend on the aperture used at all, staying on the borderline of medium and large level everywhere. What’s interesting, you can see distinct differences between specified systems. You can understand it knowing about two things. Firstly, we can’t exclude small differences between specified copies. We’re dealing with Sigma for 1 300 zl and not Leica for 20 000 zlotys, in which every element is examined separately. In the latter there are no differences between copies, in the former there are for sure. The second thing is the dependency, of showed by us aberration, on pixels size. When the pixels are smaller it’s easier to see this aberration. The observed effect is no coincidence, then, showing the smallest aberration for Canon (the biggest pixels), the same for A100 and D200 (the same pixels, but smaller than in Canon) and the biggest in Olympus E-3 with the smallest pixels. As a matter of fact, the biggest aberration is displayed in Pentax, which has the same pixels as Nikon and Sony, which, again, disconcerts us. Because either we’re dealing with the weakest lens copy (if this is so, then why do we record such high resolution?), or K10D manipulates RAW files, which effects in both distorting the resolution results and chromatic aberration. Truth be told, the second alternative is more possible, although, again, it’s a subject for a discussion on camera tests, not the lens.