![]() Second, it will be hard to INSTALL the film and shutter at the right distance. From the table, I understand the distance would be 45,46mm (am I right?). First of all – the problem is to measure the correct distance from my lens to the point where I will install my film roll and shutter. The adapter will work as the mount for the lens to my camera (making it an interchangeable-lens-camera). I have a 50mm f.1,8 lens, as well as a M42-> EOS adapter. Hi! I’m planning on building my own camera (I know, I know, bold project) and find that the flange focal distance is the biggest problem. Source: Wikipedia and Manufacturer Specs Read More About Sony Lens Adapters: It should go without saying (yet I get this question every month) but E-mount to E-Mount Speedbooster adapters are also impossible because they would need to be ZERO MM thick… Simple math explains why it’s possible to make Canon EF lens to Sony E-mount body adapters but it’s NOT possible to make a Sony E-mount lens to Canon EF body adapter, because in order to mount a Sony E-Mount lens on an Canon EF body, the adapter would need to be a NEGATIVE 26mm thick! The Flange Focal Distance of the lens must be greater than that of the camera body it is to be adapted to in order to allow room for the adapter. There is no light light loss – they simply place the lens at the proper distance from the film plane or sensor. While lens mount adapters might look like extension tubes – they are not. While this may be frustrating to Leica lens users who are used to a hard-stop at infinity – it beats the alternative that if a lens mount adapter is even slightly too long – the lens will not focus to infinity. Most lens mount adapters are constructed to be very slightly thinner than this distance which allows lenses to focus past infinity. ![]() This means that Canon EF to Sony E lens adapters need to be 26mm thick in order to make up that difference so that the lens will mount the proper distance from the film or sensor plane which allows the full range of focus from infinity to the minimum focus distance. If you scan to the chart below you will see that Canon EF-mount has a Flange Focal Distance of 44mm and Sony E-mount has a Focal Distance of of 18mm. This distance varies between cameras and lens mounts which explains the depth (or thickness) of lens mount adapters. Another way to look at this is Flange Focal Distance refers to the distance the lens needs to be mounted from the film plane. Flange Focal Distance – also known as Flange Distance or Flange Depth – is the distance from the camera’s mounting flange to the film or sensor plane. ![]()
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