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Next PZ Lens Test Report: Nikon AF 85mm f/1.4 D (FX)
[quote name='wim' timestamp='1281447464' post='1633']

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='Big Grin' />[/quote]

Yep. Still, I have some hope the AF-S will be better. Not much, though. In fact, I usually tend to be rather pessimistic ... but prepared for the best <img src='<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='B)' />

[quote name='wim' timestamp='1281447464' post='1633']

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='Smile' />). 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]

I see some potential for additional review work here <img src='<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='Big Grin' /> Seriously though: from my experience the focus shift remains visible in normal working distances with these lenses. At least with the Sigma ...

[quote name='wim' timestamp='1281447464' post='1633']

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]

Nope, only focus miscalibration. The lens was simply backfocusing, and that becomes more obvious with larger subject distance.

I haven't tested for focus shift, yet, but you're right about not being an APO lens ... at least not in the sense we usually look at it (truely apochromatic). It shows a considerable amount of LoCAs.

[quote name='wim' timestamp='1281447464' post='1633']

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


Well, I was just wondering, because I couldn't find really useful information.

However, to get to the point that's probably more important (people mixing up lateral CAs and LoCAs): maybe we should add some links to a lens test FAQ or place some short explanations within the reviews.

-- Markus


Messages In This Thread
Next PZ Lens Test Report: Nikon AF 85mm f/1.4 D (FX) - by nosingchum - 08-10-2010, 02:16 PM
Next PZ Lens Test Report: Nikon AF 85mm f/1.4 D (FX) - by mst - 08-10-2010, 02:34 PM

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