This model was launched in 1961 and is notable for a few things.
The view through this viewfinder or window can hence be slightly different from the image that hits the film.Very early Canon (J mount) used an incompatible M39 × 1/24" screw mount, 39mm in diameter but with 24 threads per inch.(Further, screwmount lenses by Meopta may at first appear to be for the Leica; however, these have 38mm screw thread and are instead for the Opema.) We will attempt to make a list of 39mm screw lenses. The lenses are usually small aperture and will provide a clear depth of field from perhaps five feet to infinity. The lens focuses, but the user has to estimate the distance.Rangefinder cameras have at least two windows which produce two images.