Quote Originally Posted by DWThomas View Post
The one hazard with adapting to standard filters is that at some size point the filter and/or shade begins to obstruct the viewing lens. I've first hand experience, having adapted my 124 G to use a Series 7 89B IR filter that has been in my possession for decades (those are about 60 mm)......
Along this issue, I will say that using a Bay I to 52mm adapter with a round metal hood, I didn't notice any shading or dimming of the viewfinder. I *did* get vignetting from the lens hood because the adapter and filter moved it further out than usual. I took the hood to a disk sander and removed a few mm to stop the vignetting.