Originally posted by steephill As you already have the lenses then why not? You can use a cheap mechanical only adaptor or get the genuine Pentax one which has its own shutter built in. You do retain stabilisation, you will be prompted to enter the (actual) focal length on start-up. There is an optical viewfinder accessory but it only give a normal lens field of view, it might be helpful in initially aiming longer lenses but not more than that.
Somewhere I have a couple of those viewfinders that you put on the hot shoe. Can't remember what FOV the frames indicate. As you say they would only be useful for general aiming but it might be fun to try. I have 28, 50 and 100mm lenses that it would be worth having a go with.
OK, off to eBay I guess.
---------- Post added 10-10-2019 at 07:35 PM ----------
Originally posted by Piotrek K If you think about handholding 100 mm could be ideal, but I do not tested this particular lens. 150 mm might be too long for many, for me it is the longest I can use, really on the border. Sharp 50 mm lenses are also good for macro on the Q.
I have an M50/4 macro - that could be interesting.