Arrived today!

sevo said:
Well, they could filter it. It is a matter of CA interfering with the three-dimensional sensor structure, and knowing the sensor and lens, aperture and focus distance it can be completely calculated out of the image. However, the latter three are unknown with manual lenses on the Nex7 - at least the lens data must be known. If you could enter the lens manually (which would either require Sony to add popular lenses to an internal database or some way for users to import their lens data into the same), that would be good enough for practical purposes - ...
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Yes, as I wrote further down in my post. ;)
 
Kent said:
Yes! Summitar 2/5cm, Elmar 4/90 and Hektor 4.5/135.
Later a Cron 35 and a Cron 50, a Summarit 75 as well as a superwide Zeiss (2.8/21). ;)
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I'm really interested in the combination of the Nex 7 with the Zeiss 2.8/21 mm. Looking forward to your post as soon as you have tested it.
 
Peter^ said:
I'm really interested in the combination of the Nex 7 with the Zeiss 2.8/21 mm. Looking forward to your post as soon as you have tested it.
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if you are talking about the zm 21/2.8 it has very soft edges at all apertures. I nearly bought one, but was warned off just in time.

The 21/4.5 has good edges on the 5n, so may be OK on the 7 but it shifts color on the 5n, so will do this on the 7 too.

I think the leica 21 elmar may be good, and both the ZM 18 and the leica 18 should be OK---maybe not optimal, but usable.

Highest priority should be a good 28, as that is the ultimate normal on aps-c.
 
uhoh7 said:
if you are talking about the zm 21/2.8 it has very soft edges at all apertures. I nearly bought one, but was warned off just in time.

The 21/4.5 has good edges on the 5n, so may be OK on the 7 but it shifts color on the 5n, so will do this on the 7 too.

I think the leica 21 elmar may be good, and both the ZM 18 and the leica 18 should be OK---maybe not optimal, but usable.

Highest priority should be a good 28, as that is the ultimate normal on aps-c.
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The 21mm/2.8 is not soft in the corners, it's unfortunate you were warned off of it - it's really a fantastic lens and I've found the extra stop to come in really hand.
 
Peter^ said:
I'm really interested in the combination of the Nex 7 with the Zeiss 2.8/21 mm. Looking forward to your post as soon as you have tested it.
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Unfortunately, the weather was absolutely dreadful that day! :(
So, I just went out for a sec (one of the few moments it was not pouring) to see if there really is this violet edge effect that they all talk about:

48546d1325708953-sony-nex-7-lila.jpg


Yes, it is clearly visible. It's not that bad that you couldn't get rid of it in post-processing, but it cannot be talked away. ;)

The sharpness in the corners is OK, though. At least not worse than I would expect from a 21mm lens on APS.
 
OK, here is my list of lenses I will use with the NEX-7(and NEX-3) regularly:

Sony SEL 18-55 OSS (as a "universal" zoom)
Sony SEL 2.8/16 (as a 24mm equiv.)
Tamron 2.5/24 (as a 35mm equiv.)
Pentax-M 2.8/28 (as a wider "normal" lens)
Fujian CCTV 1.7/35 (as an effect lens)
Olympus PEN Zuiko 1.8/38 (as a longer "normal" lens)
Konica Hexanon 1.8/40 (similar to the PEN lens)
Minolta Rokkor 2.0/45 (as a short portrait lens)
Jupiter-43 1.5/50 (as a fast portrait lens with a special effect)
Leitz Summitar 2/5cm (as a portrait lens with a special bokeh)
Konica Hexanon AR 1.4/57 (as a fast portrait lens)
Leitz Elmar 4/90 (as a tele lens)

I don't like longer lenses on a NEX, to be honest.
 
Regarding the corner sharpness of the ZM 2.8/21mm, I'd expect it to depend very much on the sensor used. The review here found it had poor corner sharpness on the NEX-5:

http://www.slrgear.com/reviews/showproduct.php/product/1411/cat/all

I don't have the 2.8/21mm, but I have found the ZM 4/18mm to perform well on the NEX-5, and even better on the NEX-5n. But then, it is a distagon and not a biogon, and the distance from the lens node to the sensor is apparently greater for the 4/18mm lens. On the other hand, the MTF curves actually suggest that the 2.8/21mm should be a little better than the 4/18mm on a cropped sensor, but of course, that does not take into account the effects of non-tilted micro lenses on the NEX-5 (and apparently also on the NEX-7), etc.

For all these reasons, the well-deserved reputation of the 2.8/21mm in other settings, for example for full frame cameras and for film, might not be reflected in its performance on a NEX camera, for example the NEX-7. Nettar
 
The NEX-7, as amazing as it is, might not be the best solution if you want to shoot with super wide angle rangefinder lenses!

There is problem whatsoever with superwide SLR lenses adapted!

And rangefinder lenses from 28mm (perhaps even 24mm - couldn't try that because I do not have a Leica 24mm RF) work very well on the NEX-7.

So, for my lens set-up, that cam is almost perfect! For others it might not be.
 
21mm/2.8 ZM isn't the problem as uhoh7 suggested, then. The camera is the problem. I use the 21mm on the Ricoh GXR M and it is sharp as a knife in the corners...that goes the same for when I'm shooting it on film. Sharpest lens I own and that is saying something because I own a 35mm summicron pre-asph.
 
uhoh7 said:
This is totally unclear, and it's misleading to make such a blanket statement, not least because you do not own the camera and have not tested this yourself.

The 5n is very picky about wides, but works very well with some. Who are you say this is not the case with the n7?

The same person who postulated a canon slr 28mm would outperform a summicron 28 on the 5n, then proceeded to send all your canon SLRs back because of poor performance.

You have been so helpful in the past with the old n5 LCD tricks etc. I don't understand your latest gun jumping in the least. Sry
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Not sure if you saw this yet. ZM 35/2 on 5N vs. 7:

http://www.bmupix.com/journal/2012/1/7/nex-7-part-2-corner-performance-with-zeiss-biogon-t-35mm-f20.html
 
uhoh7 said:
This is totally unclear, and it's misleading to make such a blanket statement, not least because you do not own the camera and have not tested this yourself.

The 5n is very picky about wides, but works very well with some. Who are you say this is not the case with the n7?
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uhoh7 said:
if you are talking about the zm 21/2.8 it has very soft edges at all apertures. I nearly bought one, but was warned off just in time.
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Did you test the 21/2.8 yourself to suggest to others that it's soft? :bang:
 
bigeye said:
Thanks for that paper. Zeiss always has great documentation on its products.

.
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Sure thing. It seems that the AA filter in the sensor filter pack seems to be one of the biggest culprits with astigmatism, and that's likely why cameras like the GXR M module don't have as many issues with these more symmetrical wide angle lenses. Whether by design, or a happy accident, the NEX-5N has a better combination of sensor filter and microlenses for rangefinder lenses, compared to the NEX-7. If corner performance at the first few aperture stops is important to you, the NEX-5N seems a much better choice than the NEX-7 with probably just about any rangefinder lens under 35mm, except for maybe a few, like the CV 35/1.2 and the Leica 35mm lenses, which tend to have a longer exit pupil to sensor distance.

I'd bet that a simple AA filter removal from the NEX-7 would improve the situation quite a bit. Unfortunately, I've yet to come across someone that offers that service for NEX cameras.
 
douglasf13 said:
I'd bet that a simple AA filter removal from the NEX-7 would improve the situation quite a bit. Unfortunately, I've yet to come across someone that offers that service for NEX cameras.
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Actually that's not true.
Color cast are not result of AA filters. GXR and 5N all have micro lenses on edge of the sensor to capture light coming in at an angle. (GXR specially designed for M lenses )
 
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