Originally posted by ClinchShots I raised the mirror and touched the glass with a microfiber cloth but I don't feel like I should do that too much
Ummm, no, you should not do that at all. The "glass" inside the camera that you see when the mirror is up is your digital sensor and it is very fragile. Do not touch! Use only a bulb blower or a wet cleaning kit specifically designed for the task.
Do you have a copy of the K-50 manual? If not, you can download a copy from the Ricoh Imaging Web site:
Downloads & Literature - RICOH Imaging (scroll down to the link for manuals)
If you want to clean the ocular (eyepiece), use lens cleaner and a Q-tip (cotton bud) to gently remove accumulated gunge.
If you want to clean the focus screen (the piece of glass inside the camera that you can see when the mirror is down), use a bulb blower. Do not touch the surface of the focus screen. Do not use canned or compressed air. The screen is very fragile and easily scratched. Once scratched, it cannot be repaired.
For what its worth, almost all used cameras have some dust specs on the focus screen that are visible as black specs or small fibers. It is almost impossible to blow them completely clean.
Steve