Sony Help with a flare problem

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Is this the flare problem I've read about with Sony cameras and 'wide' angle lenses?
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Thing is, it happened when using my 50mm too, not just the 35mm, but to a lessor extent.
 
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This really has me confused now. Here's the same shot (tripod wasn't moved) taken with the same lens only on the A7iii in a room that was darkened as much as possible within reason.
Flare is still there.
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Is the sensor stack problem really that bad?
I've never run into this before using these lenses.
Maybe I just didn't notice it?
 
These were both taken with my Nikkor 35mm f1.4 lens. Stopped down to f22.
I think it is coating reflection.
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These were both taken with my Nikkor 35mm f1.4 lens. Stopped down to f22.
I think it is coating reflection.
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I actually agree with Tim. This is far more likely attributable to diffraction softening than coatings, or a specific lens.

Nikon published a paper on the D800/D810 recommending that one shouldn't use f-stops smaller than f/8 due to diffraction softening.
 
If it's ok with the mod's here, I'll just post my locomotive photos to this thread so I don't pollute any of the others with them.
This was shot just this morning with one of the oldest lenses in my arsenal, an Elmar f=3.5cm f3.5 from @1936 or so.
SOOC jpeg except for cropping, aperture set at f18.
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Back to the Nikkor 35, I took this shot at f8. 'Flare' or whatever it is, is still there. I think it may be the 'glow' of the thorium in the glass.
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I'll give that a try in just a moment, Richard.
Here's a shot I just took with my old Wollensak 127mm at f45. Not many lenses go to f45 now days I don't think.
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Not bad for an old LTM telephoto from 1930-40's.
 
I really should use this lens more. Nikkor 50 1.4 LTM.
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@f16 with the front door closed to cut down on the side lighting, SOOC except for cropping.
 
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