I enjoy long exposure photography. And as I stated in another thread, I know that Pentax cameras are delivered with a sliding part to block light from entering the viewfinder during long exposures (in order to avoid light leaks).
The sliding tracks on the camera's viewfinder is also used to accommodate the Pentax O-ME53 Magnifying Eyecup. So the sliding tracks shouldn't be removed.
The sliding part in use:
1: Slide off the eyecup.
2: Slide on the sliding part.
3: Take the picture.
4: Slide off the sliding part.
5: Slide on the eyecup.
I never use the sliding part. Instead I use black gorilla tape to cover the viewfinder during long exposures. Put the gaffer tape over the viewfinder, take the picture, remove gaffer tape.
I would propose a button to electronically block lights from entering the viewfinder during long exposure. One push of the button - its on. Another push of the button and its off.
Last edited by troenaas; 10-14-2019 at 07:09 AM.