next PZ lens test report: Sigma 20mm f/1.4 DG HSM Art ... on 21mp and 50mp - Printable Version +- Opticallimits (https://forum.opticallimits.com) +-- Forum: Forums (https://forum.opticallimits.com/forumdisplay.php?fid=4) +--- Forum: Canon EOS (https://forum.opticallimits.com/forumdisplay.php?fid=11) +--- Thread: next PZ lens test report: Sigma 20mm f/1.4 DG HSM Art ... on 21mp and 50mp (/showthread.php?tid=846) |
next PZ lens test report: Sigma 20mm f/1.4 DG HSM Art ... on 21mp and 50mp - Klaus - 04-01-2016 Quote:Sounds good, ta....sweet soft bits too....I was thinking the edges difference 21Vs50mp's might work out this way....i like to think that Canon are putting all the extra pixels in the centre of the sensor :-) No, we (try to) calibrate for an identical sharpness perception on pixel level. However, we don't use straight JPEGs anyway so the camera defaults are irrelevant.Well, except for the vignetting figures. next PZ lens test report: Sigma 20mm f/1.4 DG HSM Art ... on 21mp and 50mp - Rainer - 04-01-2016 Seem PZ has lowered its standards ... a lens with such mediocre borders and corners wide open would not have got more than three stars some years ago. (just compare with the 24/1.4 II) But eventually there is an ART bonus somewhere. Rainer next PZ lens test report: Sigma 20mm f/1.4 DG HSM Art ... on 21mp and 50mp - JJ_SO - 04-01-2016 Eventually you should consider to name another fast 20 mm with better borders? or give the lens a try and find out for yourself if it's worth the recommendation? next PZ lens test report: Sigma 20mm f/1.4 DG HSM Art ... on 21mp and 50mp - soLong - 04-01-2016 Deleted next PZ lens test report: Sigma 20mm f/1.4 DG HSM Art ... on 21mp and 50mp - Rainer - 04-01-2016 Quote:Eventually you should consider to name another fast 20 mm with better borders? or give the lens a try and find out for yourself if it's worth the recommendation? I have no doubts the lens is worth the recommendation ... I just recalled, when the review of the 24L II came out and the review of a comparable Zeiss (21/2.8) which have absolutely comparable performance at comparable f-stops ... the 3 stars for the Canon were justified by the mediocre border performance wide open ... but as it seems the thinking within PZ has changed. next PZ lens test report: Sigma 20mm f/1.4 DG HSM Art ... on 21mp and 50mp - Klaus - 04-02-2016 Quote:I have no doubts the lens is worth the recommendation ... I just recalled, when the There's no corner performance of the Canon 24mm f/1.4 II to speak of at f/1.4 and the corners are also substantially worse at f/2. I also have to recognize that this a 20mm lens where the optical problems are a magnitude more difficult than at 24mm. It's also a world first whereas today's 24mm f/1.4 are me-too lenses. I concur, however, that the Canon should deserve a half star more though given the peak performance. next PZ lens test report: Sigma 20mm f/1.4 DG HSM Art ... on 21mp and 50mp - Guest - 04-02-2016 Fwiw, I wanted to get a Sigma 35 Art for my D750, tried 3 copies in two stores, all have significant front/back focusing. Really don't feel like sending camera and lens to sigma for calibration, or use the USB dock, so I got a 35 1.8 nikkor in the end next PZ lens test report: Sigma 20mm f/1.4 DG HSM Art ... on 21mp and 50mp - Rainer - 04-02-2016 Quote:There's no corner performance of the Canon 24mm f/1.4 II to speak of at f/1.4 and the corners are also substantially worse at f/2. Regarding the corner performance ... ... same applies for the Sigma 20/1.4 @1.4 and @2 Regarding the difference of 20mm and 24mm ... ... admitted ... but my original comment was the (in my eyes) bad judgement of the 24L in comparison to the Zeiss 21/2.8 ... I foresee that you point out that 21mm again is something completely different. Regarding "worlds first things" ... ... That had also applied to the old Sigma 20/1.8 ... which you gave 1.5 stars ... where was the "worlds first" bonus then? (ok .. the old 20 was testet on APS-C only). I daresay that I foresee the day, when the Sigma 24/1.4 tested on 50mpix will receive its 4 stars (deservedly though) ... besides the fact that it basically has the same performance than the 24L. No offence meant Klaus ... I'm just stating the obvious ... you seem to have adjusted your judgement. I neither find this good nor bad ... just "good to know" ... eventually you finally arrived in the reality of what is economically producable (rather than optically desirable). Its just that with that, your judgment of newer tests is then no longer comparable to that of older tests. next PZ lens test report: Sigma 20mm f/1.4 DG HSM Art ... on 21mp and 50mp - Klaus - 04-03-2016 Quote:Regarding the corner performance ... It is notoriously difficult to judge a lens with an extreme variations between the worst and the best spot. Just taking the line integral of the curve is pointless (and the MTFs aren't the sole aspect of truth anyway). It may be that I got a bit wiser in the sense that the extreme corner performance is not exceedingly important for most use cases - that is is for high speed wide-angles. The same logic doesn't really apply to say a 70-300mm f/4.5-5.6 zoom lens which should be sharp at max. aperture really. PS: The Sigma 20mm f/1.8 may have been a world first but honestly ... it is crap even at f/4. |