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next PZ Lens Test Report: Sony E 16mm f/2.8
#20
[quote name='BG_Home' timestamp='1283150088' post='2325']

Sorry if I offended you, that was not the intent. My opening remark was entirely tongue in cheek.



However, on the subject matter, I've never seen sharpening artefacts when downsampling, as downsampling inherently reduces sharpness (well, micro contrast, or whatever you want to call it), not increases it, and thus softens the image overall. So, unless you have sharpening artefacts in your original files already, it's hard to imagine how they could come about when downsampling. If on the other hand what you're seeing are sampling artefacts (which I haven't really seen with my files when using decent algorithms such as bicubic, either), as opposed to sharpening artefacts, I don't think you'd want to attribute them to the quality of the lens used (in fact, it would really bother me if I had to soften a downsampled image even further, leading me to question my downsampling routine...).

[/quote]

Ok, thank you for the explanation. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='Smile' />



I did get artefacts which looked like sharpening artefacts, at one of the steps (edge effects), which kept on getting worse whatever I did, and I got rid of those by desharpening the original size processed image slightly. Normally I do use alternating bicubic sharp and bicubic smooth, as not to overdo on the sharpening when downsizing, but I couldn't in this case, as I still got edge effects when downsizing. So I only used bicubic smoother for downsizing, after slightly desharpening the original size. The detail is still incredibly good.



It could be a contrast issue too, I guess, not necessarily entirely a sharpening effect.



Whatever is causing this exactly, this still is the sharpest UWA lens I have ever used or owned, even with a few degrees of tilt or a few mm of shift. I haven't seen this effect happening with any pictures taken with any other lens to this degree. Generally I could overcome these edge effects by using fewer steps of bicubic sharper and a few more with bicubic smoother. I do use the standard settings in the CS4 Raw converter for sharpness. Maybe I should set that to 0 to start with, although I never really had this happen before.



Kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....
  


Messages In This Thread
next PZ Lens Test Report: Sony E 16mm f/2.8 - by Yakim - 08-24-2010, 09:46 PM
next PZ Lens Test Report: Sony E 16mm f/2.8 - by Guest - 08-24-2010, 10:05 PM
next PZ Lens Test Report: Sony E 16mm f/2.8 - by Guest - 08-25-2010, 12:01 PM
next PZ Lens Test Report: Sony E 16mm f/2.8 - by Yakim - 08-26-2010, 10:30 AM
next PZ Lens Test Report: Sony E 16mm f/2.8 - by Yakim - 08-29-2010, 11:48 AM
next PZ Lens Test Report: Sony E 16mm f/2.8 - by Guest - 08-29-2010, 01:35 PM
next PZ Lens Test Report: Sony E 16mm f/2.8 - by Yakim - 08-30-2010, 04:38 AM
next PZ Lens Test Report: Sony E 16mm f/2.8 - by Guest - 08-30-2010, 06:34 AM
next PZ Lens Test Report: Sony E 16mm f/2.8 - by wim - 08-30-2010, 12:06 PM

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