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Loxia not identical to ZM
#1
Interesting report from the Zeiss stand at Photokina

http://www.verybiglobo.com/photokina-201...xia-story/

 

Look at the photo of coffee cup.

The loxia Biogon 35 performs much better than the ZM Biogon 35 on the A7R.

 

It seems that the Loxia would be ZM formulas with added compensation for sensor glass thikness.

More on this issue on lens rental:

http://www.lensrentals.com/blog/2014/07/...he-summary

 

Now lets hope for a Loxia 21mm.

My Biogon 21/2.8 is super sharp in the center on A7R, but with horrible color smear & softness in the corners.

 

 

#2
Honestly I think that most Leica M lenses don't work out very well on digital cameras.

#3
Quote:Honestly I think that most Leica M lenses don't work out very well on digital cameras.
 

It's a known fact that most of the M-mount wide angles are very bad on the A7r.

Lens rental's explanation is that the thin glass (about 2mm) protecting the sensor exacerbates the angle of the light rays hitting the sensor for lenses with a short exit pupil (basically the wide angle lenses with a rear element very near the sensor).

They even worked with the creator of the "speed booster" and measured the loss of sharpness when the speed booster was used on a sensor without the protective glass because the speed booster was designed with that extra glass in mind.

 

So it's quite interesting to see that Zeiss also claims to have corrected the effects of sensor glass thickness.

But it's odd that there's no official statement about this in the product description, except "specifically designed for Sony α7 cameras".
#4
Quote:Interesting report from the Zeiss stand at Photokina

http://www.verybiglobo.com/photokina-201...xia-story/

 

Look at the photo of coffee cup.

The loxia Biogon 35 performs much better than the ZM Biogon 35 on the A7R.

 

It seems that the Loxia would be ZM formulas with added compensation for sensor glass thikness.

More on this issue on lens rental:

http://www.lensrentals.com/blog/2014/07/...he-summary

 

Now lets hope for a Loxia 21mm.

My Biogon 21/2.8 is super sharp in the center on A7R, but with horrible color smear & softness in the corners.
Thanks for the interesting link.  Interesting to see how they openly address the sensor stack issue (I've been following the LensRentals articles).  I seem to recall that one of the first Zeiss blog articles introducing the Loxia made a point of pointing out that the Loixa was more economical than a ZM + adapter which in retrospect seems like an indirect way of telling people that the ZM lenses are not so good on the A7x series...while not trying to kill ZM sales...

 

The Otus 85 on A7R image is pretty compelling too...
#5
Quote:Thanks for the interesting link.  Interesting to see how they openly address the sensor stack issue (I've been following the LensRentals articles).  I seem to recall that one of the first Zeiss blog articles introducing the Loxia made a point of pointing out that the Loixa was more economical than a ZM + adapter which in retrospect seems like an indirect way of telling people that the ZM lenses are not so good on the A7x series...while not trying to kill ZM sales...

 

The Otus 85 on A7R image is pretty compelling too...
Hmm, here is the Zeiss blog post.  Maybe I was wrong about them comparing the price to a ZM+adapter, must have been another blogger.

 

http://blogs.zeiss.com/photo/en/?p=5313

 

But they do mention the filter stack:

 

"The Loxia lenses are optimized for digital full-frame sensors, and factor the approx. 2.5 mm thick low-pass and infrared filters in, situated in front of the sensor of the corresponding Sony cameras."
#6
Quick review with some samples:

 

http://www.bestmirrorlesscamerareviews.c...y-e-mount/

 

The Loxia Biogon 35/2 looks fine in the corners with A7r, nothing like a ZM Loxia Biogon 35/2

 

I'm trying to resist... 
#7
Another comparison

http://3d-kraft.com/index.php?option=com...s&Itemid=2

  


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