On a whim I snatched up a Pentax Asahi Takumar (Bayonet) 135mm f/2.5. A full manual lens, it got several good write ups, when used on the K1MII. I didn't necessarily need this focal length but being a prime and f/2.5 I bit. Took a few ambient light test shots today. First at f/2.5 2nd at f/5.6 And the last at f/8 All in all its a little bit of a pain to use. With no contacts, I have to set the focal length every time I turn it on and the meter only works in Live View. Focusing in Live View isn't to bad, with the magnification turned up its fairly easy to dial it in, but even then it seems slightly soft. I'm really anxious to try it on some portraits where that slight softness might really shine. Over the last few years I've gotten lazy with all the new technology so it will take some getting used to, but for the $25 I paid for it, I can learn to live with it.