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The ILEX shutters were made for view cameras in the USA, therefore its threads are measured in Imperial units.
There was a Kodak version made as well. It has a bit different dimensions.
| Ilex #3 | Ilex #3 (dialset) | Ilex #4 | Ilex #4 (dialset) | Ilex #5 | |
| Front lens mount thread | 1.775" - 48tpi | 1.785" - 48tpi | 2.340" - 40tpi | 2.360" - 40tpi | 2.988" - 30tpi |
| Rear shutter mount thread | 1.915" - 40tpi | 1.915" - 40tpi | 2.500" - 30tpi | 2.500" - 30tpi | 3.225" - 30tpi |
| Lensboard hole diameter | 1.985" | 1.985" | 2.604" | 2.604" | 3.365" |