The mounting thread is 42mm. The focal lengths are about 5mm, 20mm and 40mm so the first one could only really work as a macro lens.
Vintage Foreign Branded Cased 3-Valve Brass Trumpet & Mute
VTG Rexcraft USRegulation 16 3/4" Brass Bugle Made in U.S.A.
Pair small 3 hole Brass SWING IRON BRACKETS & fixings for rocking horse stand
3.00mm Brass Key Tin Toys / Tinplate Wind Up / Clockwork Trains & Models / Clock
3.00mm Brass Key For Tin Toys / Tinplate Wind Up / Clockwork Trains & Models
