On Thursday 20 March 2014 10:38:55 Torsten Bronger wrote: > Hallöchen! > > Wolfgang Mader writes: > > [...] > > > > Well you are right about the chromatic aberration. Thank you. I > > read the dpreview of the lens [1] (Sigma 50mm F1.4 EX DG HSM) > > again, and they say > > > > "Perhaps more problematic, though, is the presence of quite strong > > bokeh chromatic aberration, which is magenta in front of the focus > > plane and green behind. This is most visible at wide apertures > > with their associated extremely narrow depth of field, and can > > result in a strong fringing artifacts in high contrast regions." > > http://www.photozone.de/canon-eos/522-sigma50f14eosff?start=1 at the > bottom adds:
Nice read. Thanks. So it turns out that I used the lens at its weakest point, wide open and shortest focus distance. > > "Please note that we've to use a fairly close focus setting for > these tests. As mentioned the lens has some softness issues in such > a scenario which is why the sample crop doesn't look overly > impressive at f/1.4 and f/2." > > So, if you used a close-focus setting, too, you may see a lot of > longitudinal CA. > > Tschö, > Torsten. ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
