![[Pasted image 20250908152802.jpg]] In another post I detailed some of the [[Various Camera L-Plates]] I've designed over the years. Occasionally, I also design lens collars. There usually isn't too much to say about these designs, but my design for the Canon LCF-55 has a few interesting design elements # Retention Mechanism ![[Pasted image 20250908152833.png]] This lens foot has a spring loaded detent designed to interface with the non-removeable OEM collar. It acts as a redundancy to prevent you from dropping your lens after loosening the knob ![[Pasted image 20250908152858.png]] ![[Pasted image 20250908152905.png]] # Flexure ![[Pasted image 20250908152924.jpg]] After the satisfying click of the detent, the user is then able to tighten the knob for a rigid connection between the lens and tripod. I had to preform an FEA study to ensure that this flexure was able to achieve sufficient clamping force and travel without plastically deforming the aluminum ![[Pasted image 20250908152951.png]]![[Pasted image 20250908153004.png]] The study showed that if a user were to fully tighten the knob without being clamped onto something, it would be fairly easy to exceed the yield strength of the 6061 aluminum. This informed my decision to design a delrin travel limiter ![[Pasted image 20250908153026.png]] ![[Pasted image 20250908153042.png]] ![[Pasted image 20250908153049.jpg]] ![[Pasted image 20250908153055.jpg]] ![[Pasted image 20250908153101.jpg]]