As said, you need the lens to have an aperture ring or you will only be able to shoot wide open, and the MX having a fastest shutter speed of 1/1000th, this can become problematic...
The lens not having an aperture ring in you list are : 20-40, DA 50, 55-300, D-FA 100 WR.
As for the fact that DA lenses cover or not the 35mm image circle, you can go there :
https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/31629-da-le...ts-thread.html to know what each lens does.
FA 50 1.7 will work perfectly. I use the same lens on my MX.
Same for the M 135mm
I don't know for the 58mm, but based on what Google shows, I would say it's gonna work nicely too.
Edit : baro-nite was faster...
Last edited by nass_43; 07-16-2014 at 04:52 AM.
Reason: baro-nite was faster...