[quote name='wim' timestamp='1281350653' post='1599']
For the type of lens, I think it is an excellent one, it doesn't get all that much better. [/quote]
Not so sure about it. Judging from initial measurements, the ZF 85 seems to give slightly better sharpness in the borders, but doesn't really like close focus. I have no real hopes the Sigma 85 is any better than the "ancient" Nikkor, but maybe the (hopefully) upcoming AF-S 85/1.4 is ...
Now, the real question is: are any of the possible improvements really field relevant ... for such a lens?
[quote name='wim' timestamp='1281350653' post='1599']
Regarding the focus shift: I reckon if you can micro-adjust the AF of this lens a little, you won't notice the focus shift in real life anymore, as it seems to be only millimetres (even if it persists till F/5.6). I don't know if that is an option of the D3X however.[/quote]
Yes, focus adjustment is available on the D3x (as well on quite a few "lesser" cameras). However, the LoCA shots are done at rather close focus. Any focus error at close focus will of course be more visible at larger distances. A few milli meters may easily become a few meters (allthough often not visible with slower glass because well buried within DOF).
Just went through this with the Leica 75/2.0 APO (another lens I failed to fall in love with, btw.) Just slightly off at close focus (0.7m), but already almost 1 meter off at around 8 meters.
[quote name='wim' timestamp='1281350653' post='1599']
Regarding LoCas I do have a request. Could this please be called by its official name of spherochromaticity from here on?[/quote]
Hmm, not so sure about this one. LoCAs as short form of longitudinal chromatic aberration seems well established to me, it's used by many other sites as well (DxO, for example).
On the other hand, I have honestly never heard of spherochromaticity before. Which is true for many other, probably well established phrases, too <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt=':lol:' /> however a google search did not really shed additional light on this word, too (just 4 hits).
-- Markus
For the type of lens, I think it is an excellent one, it doesn't get all that much better. [/quote]
Not so sure about it. Judging from initial measurements, the ZF 85 seems to give slightly better sharpness in the borders, but doesn't really like close focus. I have no real hopes the Sigma 85 is any better than the "ancient" Nikkor, but maybe the (hopefully) upcoming AF-S 85/1.4 is ...
Now, the real question is: are any of the possible improvements really field relevant ... for such a lens?
[quote name='wim' timestamp='1281350653' post='1599']
Regarding the focus shift: I reckon if you can micro-adjust the AF of this lens a little, you won't notice the focus shift in real life anymore, as it seems to be only millimetres (even if it persists till F/5.6). I don't know if that is an option of the D3X however.[/quote]
Yes, focus adjustment is available on the D3x (as well on quite a few "lesser" cameras). However, the LoCA shots are done at rather close focus. Any focus error at close focus will of course be more visible at larger distances. A few milli meters may easily become a few meters (allthough often not visible with slower glass because well buried within DOF).
Just went through this with the Leica 75/2.0 APO (another lens I failed to fall in love with, btw.) Just slightly off at close focus (0.7m), but already almost 1 meter off at around 8 meters.
[quote name='wim' timestamp='1281350653' post='1599']
Regarding LoCas I do have a request. Could this please be called by its official name of spherochromaticity from here on?[/quote]
Hmm, not so sure about this one. LoCAs as short form of longitudinal chromatic aberration seems well established to me, it's used by many other sites as well (DxO, for example).
On the other hand, I have honestly never heard of spherochromaticity before. Which is true for many other, probably well established phrases, too <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt=':lol:' /> however a google search did not really shed additional light on this word, too (just 4 hits).
-- Markus
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