How will you know if you've advanced enough sprockets to continue?
If you’ve used medium format film before you’ll know that it has numbers and symbols printed on the backside of the film that lets you know when the film has been advanced to the next frame and you can stop winding. You can see these marking and numbers through a small window on the back of the camera.
35mm film cameras don’t use this feature and automatically stop advancing when the next frame is reached. With a 35mm film installed in a medium format camera with no automatic stopping on the wind mechanism, how can you tell when you’ve reached the next frame? There's some clever people over here that have worked that out. I find that the charm of film is sometimes the unexpected, so I don't keep too keen an eye on it. Shooting analog is partly about the unknown.
There are 2 methods to solve this:
Low-tech method is to wind about 12 clicks to get to the next frame (12 clicks = 12 sprocket holes)
Pulling the 35mm film over the expose area of the medium format camera I counted about 12 sprocket holes from edge to edge. With the camera back in place, you can use the small red-filtered viewing window on the back of the camera to see the sprocket holes of the 35mm film. After exposing the film simple advance the film using the winder until you count 12 sprocket holes pass the red-filtered viewing window; you’re now ready for the next frame!
Photo buffs already know the trick that red-filtered light does not expose film the same way blue light does
, so the red-filtered window on the back of the camera is save to use in this manner. For those that are unsure, you can cover this window with an opaque tape and just count the clicks to the next frame.
The low-tech method works well, but you can run into problems as the uptake spindle grows larger in diameter as you take more photos; the 12 sprocket hole trick can be wildly out of whack after some time of shooting.
Some brainy folks have figured out out mathematically
how many turns of the winding dial to get the most out of your film as you shoot.
You’re now ready to get outside and start shooting all kinds of scenes. Like most film cameras, outdoor shots will work well, and indoor shots will require a lot of light in order to show up.