My understanding is it has to do with the shape of the edge of the rear element (or elements in this case, since the it has a cemented pair at the rear). Because the IC at 8mm is significantly smaller than the FF, you're also capturing rays that pass through that edge, creating the blue line. As you can see from Martin's samples, getting the full circle depends on the direction and strength of the light.
Interesting that you also captured some reflections from the rear of the lens housing. That I haven't seen, but I haven't looked too closely at other samples.
My understanding is it has to do with the shape of the edge of the rear element (or elements in this case, since the it has a cemented pair at the rear). Because the IC at 8mm is significantly smaller than the FF, you're also capturing rays that pass through that edge, creating the blue line. As you can see from Martin's samples, getting the full circle depends on the direction and strength of the light.
Interesting that you also captured some reflections from the rear of the lens housing. That I haven't seen, but I haven't looked too closely at other samples....Show more →
I think what you are referring to with the rear element might be poor editing on my part. I lifted the shadows, but it seems to lift beyond the circle, unless I lift them through a circular mask.
shadow9d9 wrote:
I think what you are referring to with the rear element might be poor editing on my part. I lifted the shadows, but it seems to lift beyond the circle, unless I lift them through a circular mask.
