The other day I picked up an 85mm f/1.4 portrait lens to use with my Hasselblad HV. This is the first really fast lens I've owned for any camera. Anyway, I was playing around with it in the garden, and upon reviewing my test photos I noticed a surprising amount of posterization in out-of-focus background areas.
Initially, I thought this was down to the camera's lossy compression of raw files (it's based on the Sony A99 - one of numerous Sony models that, bizarrely, does not provide the option of lossless compression or uncompressed raw). But then I tried to recreate some similar shots with my K-3 and the DA70 f/2.4 - and, lo and behold, I see posterization in those images too!
It's most noticeable in out-of-focus areas of relatively high contrast within shadows, such as leaves in the shade. I've never noticed this before, and I put that down to the fact that most of my photography hasn't been with particularly fast lenses - such that my backgrounds just haven't been this smooth. Now I've noticed it, I can't unsee it. I've gone back through a bunch of my photos and, now that I know what to look for, I'm seeing it in a surprising number of shots
So, I'm wondering, how much of an issue have other members had with posterization, and do you have any techniques for minimizing or dealing with it? I've already figured out that getting the correct exposure in-camera is important, and have figured out that adding some grain in Lightroom can help to some extent, but neither technique gets rid of it. I guess I could airbrush around the transitions of colour and shade using a fine splatter, and I wonder if there are tools that can help with that?
Attached below is an example of the effect I'm seeing. This is a partial crop of the background in one of my images taken with the K-3 and DA70...