arduluth Offline Upload & Sell: Off
|
Anyone else having issues with this lens at f/8 or so?
My copy of the lens has a weird issue. It looks great at f/1.8 until at least f/4. Around f/5.6, the center starts falling apart, getting soft and low contrast. It's very obvious at f/8. I see this for both near objects like my cubical wall at 2 ft as well as for infinity scenes. Outside this soft center area, it sharpens up again toward the edges. A donut of sharpness.
I first noticed in some landscape photos which I focused at f/1.8-f/2.8 and then stopped down to f/8. Checking focus after, the center seemed quite soft. I assumed it was due to focus shift and started focusing at f/8, but noticed that the poor performance at f/8 when reviewing images later.
This one is going back. I'm wondering if anyone else has seen this. If not, I'll try another copy and hope for the best.
|