Originally posted by MarkJerling How about you post some photos?
Let's go with
this for sharpness issues (though there were some examples that were worse-- this is just the one on the memory card in my computer.) Check out the trees in the upper right hand corner.
For bokeh, there's these. Background blur is busy and ugly:
Specular highlights off the car are like fish eggs:
---------- Post added 04-13-16 at 10:23 PM ----------
Originally posted by a5m You may have gotten a bad copy. I understand how you are feeling but I think you should try and have it exchanged and give another copy a try before giving up on it.
Just FYI my copy is not tack sharp at f/2.8 between 20-23mm. I think that's how all of them are. But when you stop down a bit the sharpness increases dramatically.
Yeah. I'm already on my third copy of the lens. The first two had decentering issues, and at this point I'm just kind of exhausted. I was willing to go through several copies with my 14mm Rokinon because they're known for poor QC, but I feel like from Pentax this is a little ridiculous.