Originally posted by RonakG Surprisingly I lost the rubber eye cup from my K-5 IIs. I don't understand how can it just come off the viewfinder and get lost.
I have been through 5 already with my cameras. Probably caused by rubbing against my clothing when carrying or through careless while taking them out of the camera bag. Always worthwhile keeping a spare in the bag. If you do not use it for your current Pentax DSLR camera, there is good chance it will fit the next one.
I also keep spares for other potentially easily lost / mislaid detatchables, such as the x sync socket and viewfinder eyecup.