SUIT L2A2 Focusing?

[Peter Laidler]

It was actually Instrument Technicians who repaired SUIT sights in service and only a few Armourers were dual trade. But back to the question. The sights were focussed at infinity and we used infinity as a radio beacon mast on a distant hill!

The rear lens on the SUIT, the ocular is simply to focus the graticle that you see via a sort of binocular prism system. If my memory serves me right, the image (you actually see an image) is set and focussed at the focal plane of the grat by adjusting the focal length of the OG lens. There's more to it than that of course. But you kinow if it's all correct because when you have focussed the point of the grat via the ocular lens and then the image, via the OG lens, you will also have eliminated all parallax.

I am puzzled about your loose lenses as they came as matched sets in a housing or 'cell' and not available as parts - just a matched set. Or do you mean lens cells/assemblies? It is this/these cells that screw in and out and they didn't come loose because they were retained with tiny grub screws that even the most mechanical squaddie, with the most elaborate Leatherman or better still, Gerber multi tool couldn't get to.

There's good news though. They were made by AVIMO who are from your neck of the woods.