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Next PZ Lens Test Report: Nikon AF 85mm f/1.4 D (FX)
Hi Markus,

[quote name='mst' timestamp='1281360249' post='1607']

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 ...[/quote]

Keyword here is slightly, I think, and that is what I meant. When you get to this class of lenses, the end results are in the rendering and PP, not in the quality the lens delivers. <img src='<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='B)' />

Quote:Now, the real question is: are any of the possible improvements really field relevant ... for such a lens?

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).

I don't think so, because focus shift is relative, and at larger distances (let's say > 2 m) focus shift disappears. At least, that is my experience with lenses that display focus shift (Sigma 50 F/1.4, 50L, 85L II <img src='<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='Big Grin' />). IOW, not because it disappears with DoF (that too at smaller apertures), but because it literally disappears slowly with distance, to disappear completely from a certain distance onwards.

Quote: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.

Interesting. Not completely APO then <img src='<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='Smile' />. Also interesting that the focus shift doesn't get less with distance. Quite a different experience from the one I had so far.

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='<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='Big Grin' /> however a google search did not really shed additional light on this word, too (just 4 hits).

-- Markus

Well, it is as it is I guess. It is the official term for longitudinal CAs.

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: Nikon AF 85mm f/1.4 D (FX) - by wim - 08-10-2010, 01:37 PM
Next PZ Lens Test Report: Nikon AF 85mm f/1.4 D (FX) - by nosingchum - 08-10-2010, 02:16 PM

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