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 p.20 #17 · A7/A7r - performance with WA RF lenses | |
sebboh wrote:
hmm, the 21 lux actually looks better with regard to corner smearing than the 21 SEL at least till f/8 or f/11. the lux has that midzone dip though and much worse CA (also it's huge).
Yup, I noticed this too. Surprised me, because the Lux looked pretty bad on the NEX-7 compared to the other 21s I tested at the time. Goes to show there are many variables at play and it's difficult to predict results without actually trying a given combo first. As for the Lux's CA... yup, but it cleans up pretty well.
naturephoto1 wrote:
Ron,
That included all of the 50mm lenses, the new Zeiss 55mm FE, the 90mm Summarit, and the Sony 28-70mm, lenses.
Rich
Jeff Kott wrote:
I was wondering exactly the same thing - how could that be?
Got lucky - they were in the bag I was handed when I picked up the a7.
k-h.a.w wrote:
Thanks. Okay.
So has this effect been seen on the NEX-7? NEX-5N?
IMO, not many adapted RF lenses were perfectly free of edge smearing on the NEX camera. It was more a matter of whether or not it was casually noticeable and tolerable. Michael did some comparisons a while back between the 5N and Ricoh GXR M module, and from those it was evident just how much better the GXR was optimized for RF wides.
snapsy wrote:
Ron, thanks so much for doing this. To my eyes the Summilux 50 looks decentered on the infinity scene, with the right much softer than the left. If I'm not imagining this I wonder if it's the lens or your adapter?
I hinted at this in my write up. I can't rule out the adapter, though it is the expensive Novaflex one. I just didn't have time to run a parallel test with a Kipon adapter that was in the bag. I'm a bit suspicious as the CV12 looks pretty bad on the left side, but is sharp on the right side. Meanwhile if I use that lens on the M9, it's more consistent across the frame.
That said, it could also be my Lux. It's starting to loosen up with a slight wobble... and it has probably seen more than typical use/handling.
Also probably worth mentioning that while the Lux ASPH has a near mythical reputation, it's not a perfect lens. You just have to look at its MTF values to see the considerable mid zone dip at certain aperture values, which is fairly common across many of Leica's M lenses. Yet in use, the Lux has a certain difficult to pinpoint quality that simply looks good, particularly when shot wide open (can be said for pretty much all Luxes and Crons). With cameras like the a7 and M240 at 24MP, and the a7R at 36, the sensor resolution is pushing lenses harder than previously seen, which naturally reveals some deficiencies.
k-h.a.w wrote:
Tim Ashley has indicated that he observed some corner mush with Lux ASPH 50/1.4 on OM-D E-M1.
Interesting if true.
See my comment in the paragraph above. The thing with using lenses such as the Leica Luxes, which all have mid zone MTF dips to some degree, is that on FF, the MTF values recover towards the frame edges, giving the impression of better across frame sharpness. But when you put a 50 Lux ASPH on an APS-C or MFT sensor, the corners align with the lens's mid zone dip and look bad compared to central image quality.
nicoimages wrote:
Ron this test is an eye opener. Thank you so much for taking the time and effort to do the tests and for being the first to achieve such a task in record time and to such a high standard!
Looking forward to the a7r tests when you get the camera - sorry we don't have B&H here in the UK unfortunately and I can not use your links but would most definitely do otherwise just glad I did not order the a7.
Thanks! Someone PM'd me and suggested a PayPal donation option. If anyone wants to, just PM me and I'll provide my PP email...
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