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Further lens contemplation reminded me of my Tokina RMC 28-70mm F3.5-4.5 for m42 mount, which is deliciously imperfect, and when combined with an ultra-cheap wide-angle adapter gets even tastier.. I've struggled with this lens because the main issue with it is that it's a dumb lens and so there's no way for the cameras IBIS to know what focal length it's at. This is fine for tripod work, but that's not really how I shoot, and if it was tripod work is slow enough that I could just use primes. Then I realised that as I now own an EF speed booster I can get an EF zoom lens and it should report the current focal length to the camera and the IBIS challenge goes away. As such, I started looking for the absolute worst, most imperfect, least sharp, EF zoom lens I could find. Luckily, if you search ebay in ascending price it makes these gems obvious and you can peruse at your leisure. So I have now snapped up a lovely Tokina zoom that according to the Pentax forums has decidedly poor optical performance. Hooray!! Pics when it arrives, but I'm excited. I was also made aware of the existence of the Tokina AT-X PRO F2.8 zooms, which are interesting, but a long way from the top of the (price ascending) ebay search results. I also found a couple of the F2.6 Angie designs too, those were $3-4K.. wow!! Being famous on the internet sure makes things more expensive!