I don't see any reason why it should not. I use a lot of manual old glass and the focussing system does just the same as it does with newer glass -- it bleeps with a green hexagon when it thinks the focus is OK. It will do exactly the same in reverse with catch in focus. Instead of you twiddling the lens at something a set distance away, you set the focus and let the subject do the twiddling.
It's worth having one of these adapters anyway so you can use M42s. Check that your camera will stop one of these lenses down however (green button) or get lenses with auto-manual switches

They appear quite regularly on Ebay for very reasonable money. Might be as well to replace it?

Very nice photos !

Super set that shows a really proud mum

You can do a lot worse than browse Ebay. You can pick up umpteen manual lenses for peanuts and try them out. That's how I got most of mine and how I learned which were the best - like Takumar 55mm f1.8 (equivalent but better to your M50mm) Helios 44M-7 (stunning - needs a small modification but will take on all comers) Pentacon f3.5 30mm (which is a Meyer Optic 'Lydith') Jupiter 11A 135mm (knocks spots off a Zeiss Sonnar). None of these should cost you more than £20. And finally, the really el-cheapo Miranda 28mm macro (Ex Dixon's Bargain Basement - except it's a little gem). Just put M42 in the search box under Cameras and Photography.

There is very little left out of that site - recommended reading even if you are NOT a macro nut

The second one particularly is lovely with its rich colours and the detail is excellent

Been there, got the stent and can confirm that there is life in plenty afterwards.
We spoke a little while back about having bash at Coventry but I am in the" fortunate" spot of having more work than I know what to do with right now.
Keep taking the pills !

It's a lovely camera. I generally find that I have to brighten them and even up the contrast regularly. It's a matter of taste how much sharpening you use but you always need some. Just seems to be how the K5 presents the images, presumably because the makers assume you will know what you are doing and so leave a wide lattitude?
You've got these bang on

Some marvellous ideas there. How about Hansel and Grettel with the Aga?