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+--- Thread: Another decentered lens, another delayed review ... (/showthread.php?tid=3364)
Another decentered lens, another delayed review ... - genotypewriter - 02-24-2011
[quote name='Klaus' timestamp='1298443463' post='6286']
If I had to come up with a ranking (best to worst):
1. Olympus FT
2. Nikon
3. Canon
4. Olympus MFT
5. Sony
6. Panasonic
7. Tamron
8. Pentax
9. Sigma
10. Samsung
11. Tokina
[/quote]
Thanks for the list... wonder how they rank when zooms and primes quantities are separated. But then again, FT and MFT are mostly zooms so they must do a good QC job.
[quote name='Klaus' timestamp='1298443463' post='6286']
Prime lenses are, of course, better centered than zooms. We've rarely seen issues with primes actually.
The biggest problem makers are ultra-wide zoom lenses (usually issues at the image sides) and high ratio zoom lenses (center centering -> contrast).
[/quote]
Yes, I agree about the complexity. Also the UWA lenses need only a little error for more things to go wrong when compared to tele lenses.
GTW
Another decentered lens, another delayed review ... - youpii - 02-24-2011
Is the Sigma 85/1.4 in the pipeline?
Another decentered lens, another delayed review ... - Klaus - 02-24-2011
[quote name='youpii' timestamp='1298510049' post='6306']
Is the Sigma 85/1.4 in the pipeline?
[/quote]
yeah
Another decentered lens, another delayed review ... - Guest - 02-24-2011
[quote name='mst' timestamp='1298492025' post='6303']
The gambling is the pattern <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='
' />-- Markus
[/quote]
Do you suggest to stop gambling and start buying genuine nikon lenses only? <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/blink.gif' class='bbc_emoticon' alt=':blink:' />
Another decentered lens, another delayed review ... - Brightcolours - 02-24-2011
[quote name='Lomskij' timestamp='1298551995' post='6318']
Do you suggest to stop gambling and start buying genuine nikon lenses only? <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/blink.gif' class='bbc_emoticon' alt=':blink:' />
[/quote]
Nikon lenses CAN be decentered too, with your luck you might just hit a very decentered one <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/tongue.gif' class='bbc_emoticon' alt='
' />.I would just get the lens that gives you what you want, and let any decentering defects be "repaired" or replaced.
The Sigma 85mm f1.4 for instance is such a lot cheaper, it is worth the try. And a 150mm f2.8 macro from Sigma is a great lens without any Nikon equivalent...
There are many SIgma lenses that behave ok too. My old 18-50mm f2.8 does not have any noticable decentering problems for instance.
Another decentered lens, another delayed review ... - Klaus - 02-24-2011
[quote name='Brightcolours' timestamp='1298555674' post='6320']
Nikon lenses CAN be decentered too, with your luck you might just hit a very decentered one <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/tongue.gif' class='bbc_emoticon' alt='
' />.I would just get the lens that gives you what you want, and let any decentering defects be "repaired" or replaced.
The Sigma 85mm f1.4 for instance is such a lot cheaper, it is worth the try. And a 150mm f2.8 macro from Sigma is a great lens without any Nikon equivalent...
There are many SIgma lenses that behave ok too. My old 18-50mm f2.8 does not have any noticable decentering problems for instance.
[/quote]
The S85 seems to have other .... advantages ... too.
Another decentered lens, another delayed review ... - Brightcolours - 02-24-2011
[quote name='Klaus' timestamp='1298556674' post='6321']
The S85 seems to have other .... advantages ... too.
[/quote]
Like... smooth bokeh? Low CA? Or?
Lenstip liked it better than the Nikon.
Another decentered lens, another delayed review ... - mst - 02-24-2011
[quote name='Brightcolours' timestamp='1298568993' post='6325']
Like... smooth bokeh? Low CA? Or?
[/quote]
Heavy Coma. Maybe. At least that is what we currently suspect it is.
Nothing unusual with fast lenses, but the degree here is quite a bit disturbing. And completely ruins the MTF results at the border and corner spots until around f/5.6
I contacted Sigma Germany about this issue yesterday, but haven't heard back, yet.
Apart from this issue, the 85/1.4 seems to be one heck of a lens.
-- Markus
Another decentered lens, another delayed review ... - Brightcolours - 02-24-2011
[quote name='mst' timestamp='1298572933' post='6328']
Heavy Coma. Maybe. At least that is what we currently suspect it is.
Nothing unusual with fast lenses, but the degree here is quite a bit disturbing. And completely ruins the MTF results at the border and corner spots until around f/5.6
I contacted Sigma Germany about this issue yesterday, but haven't heard back, yet.
Apart from this issue, the 85/1.4 seems to be one heck of a lens.
-- Markus
[/quote]
Well, that lenstip review did mention quite heavy coma (worse than the Zeiss and Nikon wide open). So maybe what you see is normal <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/blink.gif' class='bbc_emoticon' alt=':blink:' />
Another decentered lens, another delayed review ... - mst - 02-24-2011
[quote name='Brightcolours' timestamp='1298580652' post='6334']
Well, that lenstip review did mention quite heavy coma (worse than the Zeiss and Nikon wide open). So maybe what you see is normal <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/blink.gif' class='bbc_emoticon' alt=':blink:' />
[/quote]
It might be normal, yes. However, I'd like to be sure. That's why I contacted Sigma.
What's puzzling is that the MTF values actually drop (!) from f/1.4 to f/2.8 and then recover again. They chart looks really strange ...
-- Markus