Originally Posted by KeithLuneau
I thought the #3 was an M6? Any idea what size it is if it's smaller than that?
There are versions of the #3 with different lens modules on them. I have two with the knurled ring on the lens being different sizes, but they both have the same dia. thread on the lens barrel.
<EDIT> I revised the following paragraph to reflect the new caliper measurements of the HD lens thread, which shows it to be closer to a 7mm thread, NOT 6mm as I previously estimated by "eyeballing" against a scale. <EDIT>
So, based on the measure dia. of the HD camera thread now being 7mm and not 6mm as I previously estimated, this would likely mean the #3 lens thread IS 6mm as you said.
Sorry for posting a visual guess rather than hard measurements in my prior posts!