|
Bad lens. Decentred lens elements. The lens is also vignetting very badly.
I got a new Samyang 24mm F1.4 and it was like that. Not as bad as that but sharp on the right and out of focus on the left. I sent it back for a replacement and the replacement was good.
Tamron is an economy brand so lens variability quality control may be an issue. I read on the net a lot about Sigmas and Tamrons and QC issues. Sigma has an art series now that are at the highest levels of performance. So they are lifting their game but the old saying you get what you pay for applies.
An old Nikon 28mm F28 AIS lens costs very little and is a very high quality lens. Try some of the older Nikons - there's some real bargains to be had.
Samyang 14mm F2.8 is a popular lens but again be prepared to return it to get a decent copy. Samyang QC is a bit sus too.
Greg.
|