markjwyatt
Well-known
This was a great thread. Good to see it pop up again.
I was mistaken. The lens is very clean (I just showed it to my repair guy also, and he concurred). I was dismayed with a sun star on one photo, but now realize this is quite normal, especially at smaller apertures (diffraction). This lens is sharp and renders nicely. See the upper right front windshield:

BMW i8 by Mark Wyatt, on Flickr
A lens hood would probably help, but the way the aperture is on the front of the lens is a little tricky.
This picture shows its sharpness and contrast rendering potential (handheld, no lens hood):

Stumpy Meets Medusa by Mark Wyatt, on Flickr
...I suspect I may need to have the Biogon cleaned- I do see some flare issues. I could see the Biogon becoming one of my most used lenses.
I was mistaken. The lens is very clean (I just showed it to my repair guy also, and he concurred). I was dismayed with a sun star on one photo, but now realize this is quite normal, especially at smaller apertures (diffraction). This lens is sharp and renders nicely. See the upper right front windshield:

BMW i8 by Mark Wyatt, on Flickr
A lens hood would probably help, but the way the aperture is on the front of the lens is a little tricky.
This picture shows its sharpness and contrast rendering potential (handheld, no lens hood):

Stumpy Meets Medusa by Mark Wyatt, on Flickr
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