I took quite a few photos today with a couple of lenses I have been a little cool on lately. Both surprised me for the better this evening.

Dandelion by Jason Doss, on Flickr
Pentax K-1 mII Limited Silver and Pentax-M 35mm f2.0 at f2.0, 1/180s, and ISO 200 at closest focus distance
I had assessed this lens in the past as not being very good under these conditions. The white filaments on top of this dandelion seedhead are sharply rendered and they are off-center, so I've changed my assessment.
also...

Poppy by Jason Doss, on Flickr
Pentax K-1 mII and Pentax-M 400mm f5.6 at f5.6, 1/1000s, and ISO 1600
Here's another lens I've had issues with wide open. It is difficult to focus due to thin DOF, but I nailed it a few times today so again my assessment has been changed. Both lenses require careful focusing and attention to proper exposure and technique.