Got it. Thanks for the photos. Certainly a cool effect.
I wonder if you would be able to find some of the stainless tube used for handrails on boats. Not sure how polished it is inside. The other option is to maybe find some circular sanding balls that fit inside of different grits to polish it up a bit.
EDIT: Here's a link to a pipe on McMaster that looks like it would do the trick. Polished inside, 1" diameter 1ft long is about $16 USD in 316L. Not sure how much it would be to ship to Canada.
I would think you would want the diameter of the pipe to match up to the diameter of your lens, correct?
Edited by JMartel, 28 January 2019 - 07:48 AM.