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Next PZ lens test report: Nikkor AF-S 85mm f/1.4 G (FX)
#21
[quote name='Yakim' timestamp='1304494884' post='8046']

Where is focus shift mentioned in this review?

[/quote]

For such a fast lens this is an impressive performance. Unfortunately there is one issue that spoils the party a little bit: the lens showed a slight amount focus shift when stopping down (residual spherical aberration).
#22
[quote name='borisbg' timestamp='1304525375' post='8066']

For such a fast lens this is an impressive performance. Unfortunately there is one issue that spoils the party a little bit: the lens showed a slight amount focus shift when stopping down (residual spherical aberration).

[/quote]





Hmm, what I don't quite understand is why focus shift would matter much in practical use, especially once you know it's an issue to have in mind <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='Smile' /> What I mean is that normally you keep acquiring focus on your subject, almost every second, while the aperture change is far less frequent, and then it's like a natural thing to focus, change parameters, refocus, then shoot.. Or am I wrong here ?
#23
[quote name='wojtt' timestamp='1304583927' post='8075']

Hmm, what I don't quite understand is why focus shift would matter much in practical use, especially once you know it's an issue to have in mind <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='Smile' /> What I mean is that normally you keep acquiring focus on your subject, almost every second, while the aperture change is far less frequent, and then it's like a natural thing to focus, change parameters, refocus, then shoot.. Or am I wrong here ?

[/quote]



There's no right and wrong, just different shooting methodologies. I - for example - always change parameters before I raise the camera to my eye and never re-focus (I use the outer AF points instead. Thus, if I selected an aperture smaller than max e.g. 2.8 for more DoF, then focus shift will be an issue for me. That is, if it's not covered by the increased DoF of course.
#24
[quote name='wojtt' timestamp='1304583927' post='8075']

Hmm, what I don't quite understand is why focus shift would matter much in practical use, especially once you know it's an issue to have in mind <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='Smile' /> What I mean is that normally you keep acquiring focus on your subject, almost every second, while the aperture change is far less frequent, and then it's like a natural thing to focus, change parameters, refocus, then shoot.. Or am I wrong here ?

[/quote]

I think so. You miss that the camera does not focus at the desired aperture, but always with the lens' aperture wide open. The focus shift then occurs only when taking the shot.
#25
[quote name='ThomasD' timestamp='1304594114' post='8080']

I think so. You miss that the camera does not focus at the desired aperture, but always with the lens' aperture wide open. The focus shift then occurs only when taking the shot.

[/quote]



In practical terms this is an issue in shallow depth-of-field situation where the focus shift is not sufficiently "overtaken" by the increased depth-of-field.
#26
Would just like to ask, how does the 85mm f1.4G fare as a landscape travel lens, as i am currently trying to consolidate my lenses. I have a 85mm f1.4D and a 100mm Zeiss. I am thinking perhaps selling both and using the G for dual purposes.



And Markus, do you mind letting me know if the corner sharpness testing on photozone was done via focusing in a far distance or close?



Thanks
#27
[quote name='jtiong' timestamp='1331590848' post='16630']

Would just like to ask, how does the 85mm f1.4G fare as a landscape travel lens, as i am currently trying to consolidate my lenses. I have a 85mm f1.4D and a 100mm Zeiss. I am thinking perhaps selling both and using the G for dual purposes. [/quote]



If you don't need the close focus of the Zeiss lens, that sounds like a good idea to me. Personally I consider 85mm and 100/105mm too close in focal length and angle of view to carry both.



[quote name='jtiong' timestamp='1331590848' post='16630']

And Markus, do you mind letting me know if the corner sharpness testing on photozone was done via focusing in a far distance or close?

[/quote]



The MTF testing on FX is done at roughly 40x the focal length, so around 3.4 meters for the 85/1.4 G. On DX its 60x the focal length.



-- Markus
Editor
opticallimits.com

#28
[quote name='youpii' timestamp='1304433278' post='8028']

Thanks for the review.

I'm very impressed by Nikon. They're making so many new prime lenses recenly.

But they still lack an affordable high pixel-count FF camera like the 5d2 or a900.

[/quote]





Well they have now
  


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