M42 thread isn't the same as Tmount M42 is 42x1.0 and Tmount 42x0.75. If you apply some force a Tmount adapter fill fit on a M42 lens. You won't get infinity focus with this combination. Tmount are made for special lenses and other things like microscope and telescope adapters.
If your 200mm does focus at infinity it's not M42 but tmount on the lens Toine On 25 June 2010 14:57, Malcolm Smith <malcolmsmi...@btinternet.com> wrote: > The great benefit of sticking with Pentax for me has been the continued use > of M42 screw thread lenses. I use them with a small Pentax K ring to M42 > thread in both my film and digital SLRs. I've recently acquired for a very > small sum a 200mm M42 lens that has a T mount attached to it. As it still > has a screw thread, it works perfectly with the usual mount. Is the real > purpose of this mount so that you can fit a K mount to it as a permanent > fixture, and then use it as you would any other K mount lens? > > Malcolm > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
