Edward, are the concentric circles a lens problem, or a sensor problem or maybe a sensor+lens problem? As a long time ago, I found that certain lenses would do that only on certain bodies (in my Canon days).
adamdewilde wrote:
Edward, are the concentric circles a lens problem, or a sensor problem or maybe a sensor+lens problem? As a long time ago, I found that certain lenses would do that only on certain bodies (in my Canon days).
The A7/R sensor is notorious for its mirror like very reflective surface, in fact causing flare in situations and with lenses that are not really prone to.
My theory is that the aspherical elements of the lens are reflecting on the sensor, causing this phenomenon.
This said, this is the first time I encounter this issue in my own photos, but I suspect it is easily reproduceable.
edwardkaraa wrote:
The A7/R sensor is notorious for its mirror like very reflective surface, in fact causing flare in situations and with lenses that are not really prone to.
My theory is that the aspherical elements of the lens are reflecting on the sensor, causing this phenomenon.
This said, this is the first time I encounter this issue in my own photos, but I suspect it is easily reproduceable.
I can see the A7 file can easily goes discontinuous on tonality more often than other camera, I always feel their raw file have less flexibility in PP. I thought it is come from compressed raw when you pull down luminous blue channel. Now your reply make me rethink that could from sensor topping with uneven exposure.
zhangyue wrote:
I can see the A7 file can easily goes discontinuous on tonality more often than other camera, I always feel their raw file have less flexibility in PP. I thought it is come from compressed raw when you pull down luminous blue channel. Now your reply make me rethink that could from sensor topping with uneven exposure.
Your remark is also true, Michael. The cause is not clear though, but I personally believe it is the compressed file at fault here.
itai195 wrote:
I must be going blind; where are these concentric circles?
You should look in the blue sky area. There are sort of "onion rings" in lighter shade that look very much like the "onion rings" that you see in OOF light sources when using a lens with aspherical elements.
edwardkaraa wrote:
Here you can see the dreaded concentric circles of the FE 35.
Edward - I can easily reproduce this banding with the way I process.
This is on various lenses (Nikon, Voigtlander, native), so am not sure if it is a lens specific issue.
My guess is that the steps between the values are not as discrete vs. other true 14-bit RAW files. I also shoot with both a 1DX and a D800E and it does not exhibit this behavior.
Excellent shots everyone, and this thread moves so fast!
Edward, wonderful portrait and shots!!
The issue you having with the concentric circles I have seen, also with the 5DII, M9, M-M, M240 but not yet with the A7r, and WA's(35 and below) It is always is in the sky, with WA's and I suspect it is a posterization issue, where there may not be sufficient data in channels to correctly interpolate. It may well be an issue under certain conditions with LR/CS6 software. I think if you search, there are whole threads on this topic. Usually I find the 16 bit Tiffs are fine, but then when downsizing 8 bit Jpegs is where the problem shows, where the sky has been pushed. I suspect it depends on your exposure, and how much data there is available later to push later in PP'ing
Another interesting observation with seascapes, it seem to be worse when the sun is behind you, and usually about mid morning or mid afternoon.
edwardkaraa wrote:
You should look in the blue sky area. There are sort of "onion rings" in lighter shade that look very much like the "onion rings" that you see in OOF light sources when using a lens with aspherical elements.
Ah I see it now. I wonder if the vignette slider would help with this? I remember seeing this a lot with my Olympus 12mm lens.
Taken at a fish tank in a local athletic clothing store in the city where I live. This guy was a show off. In a blow up you can clearly see every scale on his body. The resolving power of this camera/lens combo is amazing. a7r with FE 55/1.8. ISO 250. LR 5.
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