I've had a lucky few days thrifting and got some new toys to go with the M42 adapter I bought myself when xmas shopping. Best item was the Sears 55mm f1.4 in great condition that I found attached to a very old Sears T.L.S. with a dented pentaprism. (The camera looks like the 1967 Ricoh T.L.S., does that mean that my lens is Ricoh too, or are all the Sears f1.4 made by Tomioka?) Today, I found 2 Sears branded tele converters that are also in great shape, but I don't know exactly how they're used. a. Can they be stacked to get even more "tele"? b. How do I use the aperture ring on the adapter? Should that aperture ring just be turned to match the lens? Thanks for your help.