Have a used 18463 extension for sale. I'd rate it conservatively as an 8/10. This is the previous generation, with the only difference being the built in lock. This one has the lock they sold for them installed, works identically to the newer version.
I know it fits the Canon 8-15 and Nikon AF 18-55mm f/3.5-5.6G ED VR. It's 21.5mm/.82".
$120 shipped via USPS Priority within the US, message me for international.
Edited by lylefk, 05 September 2018 - 07:49 PM.