![optics - How can I increase the flange focal distance (back focal length) of DSLR lens? - Photography Stack Exchange optics - How can I increase the flange focal distance (back focal length) of DSLR lens? - Photography Stack Exchange](https://i.stack.imgur.com/jvzLX.png)
optics - How can I increase the flange focal distance (back focal length) of DSLR lens? - Photography Stack Exchange
![terminology - What exactly is focal length when there is also flange focal distance? - Photography Stack Exchange terminology - What exactly is focal length when there is also flange focal distance? - Photography Stack Exchange](https://i.imgur.com/V1WySTT.gif)
terminology - What exactly is focal length when there is also flange focal distance? - Photography Stack Exchange
Ultra short 18 mm flange distance on FF has more vignetting.: Sony Alpha Full Frame E-mount Talk Forum: Digital Photography Review
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