Hi,
I have a 52mm thread to K mount adapter, which I (rarely) use with my SMC-M 50mm/1.7.
Today I tried it with my SMC-M 28/3.5 to get that extra magnification, with a step-down ring to get to the correct 48mm thread size.
Big surprise, there was a glow right in the middle of the image.
It changed size and intensity by varying the aperture (more strong and concentrated when stopping down, obviously), and wasn't related to the angle of the light used to illuminate the subject (diffused room light, flash camera left... same thing), nor the camera angle (I was shooting a coin so I thought it could be a reflection).
I know that the 28/3.5 isn't known for good flare resistance, and that by inverting I completely forfeit the SMC, but if it was a flare I could have controlled it by just changing the position of the light, right?
So what the heck is that?
RAW all default:
strange flare by
Lens Beginner, su Flickr
Thanks in advance