I also see this behavior with my Tamron 35/2.8, actually a little stronger than the CV 50. It seems to help for that lens as well, although maybe not quite as well as with the CV 50.
I started looking at other cameras (non Sony), and I think I can see this behavior on other brands. Including Canon which means a non-Sony sensor.
Anyway, not trying to make a mountain out of this. But if anyone notices this type of thing, it may be worth trying the Zeiss UV filter.
-Tim
vdo1 wrote:
Sorry, I wasn't actually complaining about the DNG thing, I found that the difference was mostly visible at small image size (when occupying about 50% of the monitor screen)
Anyway, now we have proof that Zeiss UV filters, when used with certain lens and Sony sensors, can do some useful things beyond just protecting the front element from dirt and scratches.
I changed from a Sony A7rII with Loxia lenses to a Nikon Z7, initially intending to adapt the Loxia lenses to the Z7. That should work I thought, but I got "horrible" color drift towards the frame edges, a kind of blue cast that drained the color saturation at the frame edges. Horrible to me, although I could find only a few posts that adressed this, so it is very personal, in that it is factually there, but not everyone notices it to the same degree. It was reason for me to sell the Loxia lenses and try the Nikon S lenses. They were much better, but I could still see some kind of shading at the left and right frame edges that went together with a cooling of the image colors. So if I applied a local white balance correction at the frame edges of around 1000-1500 kelvin, then color rendering became even across the frame. Nikon still has some work to do here with the sensor stack I suppose. Anyway, I sorely missed the Loxia lenses, esp. 25/2.4, so I switched back.
tsdevine wrote:
I also see this behavior with my Tamron 35/2.8, actually a little stronger than the CV 50. It seems to help for that lens as well, although maybe not quite as well as with the CV 50.
I started looking at other cameras (non Sony), and I think I can see this behavior on other brands. Including Canon which means a non-Sony sensor.
Anyway, not trying to make a mountain out of this. But if anyone notices this type of thing, it may be worth trying the Zeiss UV filter.
Interesting. I think I notice a little bluing towards the corners of my FE 85/1.8, at least it doesn't look purely like light falloff. It seems like some interplay with certain lenses, the digital sensor stack, and maybe some sensitivity to near UV/UV.
As I shoot my other lenses, I'm being a little more mindful of this, looking for any oddness. I will say the magenta color seems to stand out more to me and that's why I first noticed it.
-Tim
ChrisMak wrote:
I changed from a Sony A7rII with Loxia lenses to a Nikon Z7, initially intending to adapt the Loxia lenses to the Z7. That should work I thought, but I got "horrible" color drift towards the frame edges, a kind of blue cast that drained the color saturation at the frame edges. Horrible to me, although I could find only a few posts that adressed this, so it is very personal, in that it is factually there, but not everyone notices it to the same degree. It was reason for me to sell the Loxia lenses and try the Nikon S lenses. They were much better, but I could still see some kind of shading at the left and right frame edges that went together with a cooling of the image colors. So if I applied a local white balance correction at the frame edges of around 1000-1500 kelvin, then color rendering became even across the frame. Nikon still has some work to do here with the sensor stack I suppose. Anyway, I sorely missed the Loxia lenses, esp. 25/2.4, so I switched back.
Nikon Z7 and Loxia lenses have nothing to do with the APO Lanthar 50/2 on a Sony camera. It works well without issues and even without an expensive Zeiss filter.
None of the Sony cams that I know have any UV sensitivity even down to blue 405nm. That is not an issue.
Keeping the optical path and the sensor clean (devoid of lint, finger prints, etc) helps.
So what do you think I'm seeing on my CV 50/2 APO and Sony a7R III? I'll will certainly agree that a majority of people may not be sensitive to what I'm seeing. But I'm still curious of the cause.
-Tim
realVivek wrote:
Nikon Z7 and Loxia lenses have nothing to do with the APO Lanthar 50/2 on a Sony camera. It works well without issues and even without an expensive Zeiss filter.
None of the Sony cams that I know have any UV sensitivity even down to blue 405nm. That is not an issue.
Keeping the optical path and the sensor clean (devoid of lint, finger prints, etc) helps.
tsdevine wrote:
So what do you think I'm seeing on my CV 50/2 APO and Sony a7R III? I'll will certainly agree that a majority of people may not be sensitive to what I'm seeing. But I'm still curious of the cause.
Just to be clear: I only noticed the color casting with the Nikon Z7, I don't see anything of the sort with my A7RII and any of the Loxia lenses. It was a second reason next to the Loxia lenses themselves, to switch back to Sony, as I really did not like the uneven color in particular daylight scenes. You could easily make the effect visible by pushing tonality on clouded (white/grey) skies for instance, a clear shift towards blue at the left and right frame edges. I never noticed anything alike with the A7RII/ Loxia combo's.
tsdevine wrote:
Interesting. I think I notice a little bluing towards the corners of my FE 85/1.8, at least it doesn't look purely like light falloff. It seems like some interplay with certain lenses, the digital sensor stack, and maybe some sensitivity to near UV/UV.
As I shoot my other lenses, I'm being a little more mindful of this, looking for any oddness. I will say the magenta color seems to stand out more to me and that's why I first noticed it.
I have been testing this lens for the past week and while I do think I still prefer my 40/1.2 just for its versatility, speed and focal length, plus the lovely look it gives, the 50 APO is nearly optical perfection.
100% extreme corner crop at f/2 on A7R IV at 60MP:
I think it might be the sharpest lens I've ever tested - I didn't get a chance to test the Sigma 135/1.8 in pixel shift mode and that thing was a razor at f/1.8, but this might very well be sharper. This thing is sharp, in the extreme corners, on the A7R IV in 240MP Pixel shift mode. Blown away. Even the Sony 90 Macro wasn't that good in the corners in pixel shift mode.
This is a 100% extreme corner crop wide open at 240MP:
It's not perfect wide open at this resolution, but it's not far off. Stopping down to f/4 yields effectively perfect resolution to the extreme corner. Insane. Of course, those of you who own the lens I'm sure already know all this, but I had to gush a bit.
Oh, and here are some actual shots from it from today:
I have got a problem with my lens. I see the green circle at the center of my image. So, I try to push the aqua colour to distinguish the circle, (Hue-100, Sat+100). This problem happens only when I shot toward this building and sky.
If you go back one page, you'll see that a Zeiss UV filter (which has a pretty steep cutoff around 410nm) resolved this for me. I don't think just any UV filter will do, as I also have a Breakthrough Photography UV filter and it didn't seem to do the trick.
YMMV
Tim
Polly wrote:
I have got a problem with my lens. I see the green circle at the center of my image. So, I try to push the aqua colour to distinguish the circle, (Hue-100, Sat+100). This problem happens only when I shot toward this building and sky.
tsdevine wrote:
If you go back one page, you'll see that a Zeiss UV filter (which has a pretty steep cutoff around 410nm) resolved this for me. I don't think just any UV filter will do, as I also have a Breakthrough Photography UV filter and it didn't seem to do the trick.
YMMV
Tim
Much obliged, Tim. I will try the Zeiss UV filter.
Thanks guys. This might be shading correction, which is turned on, not the APO. This problem might be also a camera problem as far as I have researched. Need more experiment.
All I can say is that I had a similar problem, and turning off shading correction did not solve it. The Zeiss UV filter seems to have solved it for me though.
Going to start a separate thread on this phenomena later today. I see this behavior on another one of my lenses, besides the CV 50/2 APO.
tsdevine wrote:
My issue happens with all in camera corrections off. Good question for Polly though. Turn off shading correction in camera if it is turned on.
-Tim
Sorry I don’t even have this lens (though it looks amazing!) but this effect does not appear to be unique to any one lens. I have seen it on the FE35 f/1.8 and the 55 f/1.8ZA at the very least. If it’s just the haze filter that is the fix, I will be very happy. But from discussions I have seen, it might actually be shading correction that, even when the lens corrections are turned off in camera, continue to be baked into the raw file. And it doesn’t appear when the contacts of the lens are taped over to make it a dummy lens. Just my two cents, perhaps a haze filter helps, I don’t know, but it may be something in the lens profile causing it.
I'm familiar with the magenta ring phenomena...and corrections that really can't be completely turned off. And I don't discount that exists.
But the filter puts it in the "looks good" category for me, which is good enough.
-Tim
abadger wrote:
Sorry I don’t even have this lens (though it looks amazing!) but this effect does not appear to be unique to any one lens. I have seen it on the FE35 f/1.8 and the 55 f/1.8ZA at the very least. If it’s just the haze filter that is the fix, I will be very happy. But from discussions I have seen, it might actually be shading correction that, even when the lens corrections are turned off in camera, continue to be baked into the raw file. And it doesn’t appear when the contacts of the lens are taped over to make it a dummy lens. Just my two cents, perhaps a haze filter helps, I don’t know, but it may be something in the lens profile causing it....Show more →
tsdevine wrote:
I'm familiar with the magenta ring phenomena...and corrections that really can't be completely turned off. And I don't discount that exists.
But the filter puts it in the "looks good" category for me, which is good enough.
-Tim
Looks like I will have to try out a Zeiss haze filter...even if it helps a little, worth a shot! Thanks.
tsdevine wrote:
I'm familiar with the magenta ring phenomena...and corrections that really can't be completely turned off. And I don't discount that exists.
But the filter puts it in the "looks good" category for me, which is good enough.
-Tim
Tim, does the problem disappear when you slightly dismount the lens to cut the electrical interface, as abadger suggests?
I'll try to check today or tomorrow, but I doubt it as it wouldn't make any sense that the UV filter helps. (If it's purely wonky processing in camera.)
I sort of moved this conversation to this thread, as I think this behavior isn't limited to just the CV 50.
