chiron
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 Re: Sony 50mm f/1.2 GM | |
keepcoding wrote:
j4nu wrote:
BastianK wrote:
derKoekje wrote:
BastianK wrote:
Holger wrote:
Buckeye2604 wrote:
Holger wrote:
j4nu wrote:
I think I can live with heavy vignetting or focus breathing as I don't care too much for those but 2 things from lenstip review might affect overall picture quality imho:
* rather unexpected astigmatism
* moustache distortion.
Not deal breakers, but something to keep in mind I think.
The Canon has clearly more vignetting, half a stop more (if opticallimits is correct), look after 6:15 in Manny's video, too. Looks like the Sony is comparable to the Nikon, here.
Distortion is a bit higher (0.6% vs. 0.25% (Nikon) vs. 0.2% (Canon)), but nothing to be concerned about , imo. I think Sony went the Sigma route in trading size for distortion.
CAs look indeed well controlled. I expected the Nikon, due to its size, to be better:
https://www.cameralabs.com/nikon-z-50mm-f1-2-s-review/2/
But that doesn't seem to be the case.
I like Manny but it’s seems pretty clear he had vignette control enabled on Sony (-2.9ev per lenstip) and Nikon (maybe?) but not Canon (-3.2ev per optical limits). Less than a half stop difference wouldn’t be the drastic difference shown in his examples - we don’t know his exposure either. I like to leave the technical reviews to the sites that repeat those types of tests frequently and influencer YouTube videos for entertainment.
That is of course a possibility and you could well be right. That would be a grave omission indeed (the first thing I always do is switch all in-camera corrections to off).
I was surprised, though, to find the Sony showing less vignetting than the Canon, given the size and weight of the lens. Oftentimes the smaller mount was cited as a culprit, but Sony seems o be able to design around it.
Don't expect too much from the (especially early) "reviewers".
I see plenty of samples taken at very fast shutter speeds with EFCS on, clearly harming the bokeh.
When it comes to vignetting numbers I trust no one who does not state the distance he took the samples
at and fully discloses the RAW editing.
The focus distance is a massive factor, lenses often show 1 EV+ less vignetting at closer distances compared to infinity
(this is also why the "FF lens xy shows only moderate vignetting on GFX" claims backed up by a sample image taken at MFD are completely bogus,
hope no one falls for that only to discover later that the corners are just black in actual shooting...).
A slight change in tonal curve (and cameras from different manufacturers come with different tonal curves) can have a notable influence here, too.
To be fair Bastian I think most reviewers are using the A1 with electronic shutter so I don’t think EFCS is much of a factor with this lens’ reviews at least. And come on. Disclosing distances? If you’re used to a focal length like the reviewer you are then I’m sure you’ll have a pretty decent guess to the distance the subject is from the camera. I know you’re critical but I feel this is just shorthand for: I don’t trust anyone but myself. Which is fine but why be interested in the samples and early discussion in the first place?
I trust anyone who discloses his testing, which is not true for many unfortunately.
My point about vignetting was mainly: when you compare values from different sources or even derived from different cameras you are most likely comparing apples to oranges.
Furthermore, I am 99% sure I see EFCS artefacts in most of the Lenstip samples, especially this one:
And 85% sure this "official Sony sample" shows it too:
https://www.sony.net/Products/di_photo-gallery/lens/SEL50F12GM/#post-1697
And no, no matter how good a reviewer you are, with a plain white image where you only see the shading
you can not tell at what distance it was taken.
I still don't know at what distance lenstip is checking, but as I got the same exact values out of the same sample of the same lens I guess it is infinity 
PS: I am genuinely interested in the bokeh rendering of the GM 50mm 1.2, so I think I am allowed to look at the early reviews
Yep, that lenstip sample is 100% EFCS.
I find the whole EFCS situation in Sony-land quite ridiculous. Even seasoned testers forget about its effect with high shutter speeds, the same way I do when the light changes and I'm shooting at wide apertures.
I'm also not really thrilled with the approach Sony has taken to this "problem" with A7c and A1. In the latter case (and in my planned usage luckily), you could argue you don't really run into the issue as you can stay in full electronic for most (if not) all the time. I wonder though how the future A7IV and A7RV will fare with slower sensor readout and no full mechanical shutter option...
Yes, ridiculous indeed. I don't understand it, four generations of cameras and Sony still hasn't thought of adding an option to automatically select full mechanical shutter if shutter speed is above 1/500s... AFAIK most other cameras have this.
FWIW, Mark Galer doesn't think the EFCS issues at high speed/large aperture is worth worrying about.
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