Will a loose viewfinder cause unwanted light to enter?

[ben_wickerham]

I have a Bronica ETRS with a basic, non-metered viewfinder. It locks into place,

but it able to shift front to back slightly. I am curious as to whether this

causes any unwanted light to enter during an exposure. I've heard that this

movement is common, but have not heard about any potential consequences. Thanks

for any input!

[russ_britt3]

I will not cause any exposure problems, as the mirror moves up blocks the view finder area. If using a waistlevel finder light is always coming in this part of the camera. So no unless you have other problems with the camera.