Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
next PZ lens test report: Tokina AF 16-28mm f/2.8 AT-X Pro FX
#1
[url="http://www.opticallimits.com/canon_eos_ff/595-tokina162828eosff"]http://www.opticallimits.com/canon_eos_ff/595-tokina162828eosff[/url]



Very good ... potentially at least.
#2
[quote name='Klaus' timestamp='1297839634' post='6148']

[url="http://www.opticallimits.com/canon_eos_ff/595-tokina162828eosff"]http://www.opticallimits.com/canon_eos_ff/595-tokina162828eosff[/url]



Very good ... potentially at least.

[/quote]



Thank you for the interesting reviews published recently, and also thanks for the clear words in the conclusions to the Tokina review regarding quality control. Buying lenses is no fun, unfortunately. And it does not really help that one is able to return lenses to the dealer if bought online (at least in Germany), since lens testing is time consuming and should be part of quality control in the manufacturing process and not part of the "consumer experience".



I wonder what could be a wake-up call to the manufacturers since these problems persist for many years, maybe many decades. Obviously, it pays off to cut costs in quality control since many -- that is my hypothesis -- less-informed consumers just shoot and do not reflect about one-sided unsharpness or misfocus. If the results are bad, they may blame themselves and quit their hobby, or they may be not that interested in the technical quality, or they may just look at small-sized prints, I don't know...



--

Wolfram
#3
[quote name='Klaus' timestamp='1297839634' post='6148']

[url="http://www.opticallimits.com/canon_eos_ff/595-tokina162828eosff"]http://www.photozone...kina162828eosff[/url]



Very good ... potentially at least.

[/quote]



I think this one's going to be appreciated by most of the FF users... Thanks for the effort Klaus and good luck to Markus for the Nikon mount...



Serkan
#4
Looks like that, if I can afford in future to add a full frame camera and lenses (24mm f2.4 L USM II for one), this Tokina will be on my list.. Even though my bad experience with the 12-24mm f4, with its design fault that never got acknowledged by Tokina (but they know about it).
#5
Nice to see Tokina is getting their c.a. under control. Any issues with purple fringing? Any comments regarding flare?



Good for you Klaus regarding your rant on centering issues. I hope manufacturers take notice. I think the current situation is completely unacceptable, and I can't help but think that if one of the manufacturers starts testing and guaranteeing alignment of their premium lenses (Canon L, Sigma EX, Tokina ATX Pro, etc) they'll capture market share plus they can justify charging more.



Imagine buying a car and having a 25% change of proper wheel alignment and valve timing. Sheesh!



As for optical rating, maybe it should be 1 star to 4.5 stars, depending on how lucky you are?
#6
The weight of the lens is amazing. Seems to be designed for fullframe car campers <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='Wink' />
#7
I've been wondering if the flatness of the focal plane is going to affect the corner resolution readings for these ultra wide lens tests. In another word, is the wide open corner softness more or less caused by off-focus corners while the center is in-focus? I don't believe the focal plane for ultra wides could be absolutely flat to allow both the center and the corner of the testing board to be infocus at the same time.



Regards,

james
#8
[quote name='james' timestamp='1297892790' post='6178']

I've been wondering if the flatness of the focal plane is going to affect the corner resolution readings for these ultra wide lens tests. In another word, is the wide open corner softness more or less caused by off-focus corners while the center is in-focus? I don't believe the focal plane for ultra wides could be absolutely flat to allow both the center and the corner of the testing board to be infocus at the same time.



Regards,

james

[/quote]



This is taken care of - see lens test faq.
#9
Yeah, a simple workaround to avoid the problem...



And just out of curiosity... how can we distinguish residual spherical aberration (focus shift at closed aperture) from field curvature? Is the field curvature effected by the closing of the aperture?



Serkan
#10
[quote name='PuxaVida' timestamp='1297947635' post='6190']

Yeah, a simple workaround to avoid the problem...



And just out of curiosity... how can we distinguish residual spherical aberration (focus shift at closed aperture) from field curvature? Is the field curvature effected by the closing of the aperture?



Serkan

[/quote]

If you have focus shift, you simply have a miss focussed image. The camera focusses wide open, and when the aperture closes for exposure, the focus shifts. And you get out of focus results.



Field curvature, you get in focus centers and out of focus edges. Usually only noticeable when the corners are supposed to be clearly in the same focal plane as the center, but OOF.
  


Forum Jump:


Users browsing this thread:
1 Guest(s)