So I have a Canonet 28 that I purchased off ebay a while ago. It had some dirt particles between the lens elements, so I took it apart and cleaned it. I ran a roll of film through it and every shot was out of focus (I checked the negatives to rule out the photo lab). The range finder matches the markings on the lens barrel, so I'm guessing both the finder and the front element need adjusting. Unfortunately the camera does not have a B or T function, so I don't know if or how I could use a piece of ground glass to find the proper focus. Any suggestions?