Hi, I recently purchased a Mamiya Sekor 500 DTL from eBay. I loaded the film earlier today, however after taking 2 pictures there seems to be an issue with the mirror and the viewfinder is entirely black. I didn't notice any problems when taking the first picture (Shutter speed of 500 and aperture of 16) However when taking the second picture (Shutter speed of 60 and aperture of 2.8) The viewfinder turned black and I couldn't press the shutter button, upon further expectation I noticed that the mirror seemed to be stuck, I tried pushing it back however this didn't work. What could the issue be, and how could I solve it? Thanks, FYI this is my first film camera, and I know pretty little about shooting film.
