Originally posted by irishwhite by being a pain, i meant switching from one to the other in the frigid windy winter evening as i had done recently switching from a kmount 50mm, throwing on the adapter, and then screwing on my super-tak 150. don't get me wrong, i won't hesitate to do it, i just prefer to do it in a quicker manner.
Despite my fanatical love of the Takumars, I would never try to tell anyone that they (or any other M42 lens) are right for every shooter or every situation.
The easy solution to the aggravation of switching from K-mount to M42 and is to fill your bag with M42 lenses. They are all I carry with me 99% of the time.