coupling adaptor

[Freak]

Hello everybody,
I woul like to couple a componon-s 5.6/100 with a componon 4/28. To couple them I need a coupling ring male 43 but I cannot find it on ebay. Some suggestions?
Thanks a lot.
Daniele

[chris_ma]

Heliopan makes a lot of different sizes.
more expensive then ebay cheapos but made of brass and therefore less likely to get stuck

[JKT]

Have you tried Aliexpress? The selection there is better.

[Freak]

I cannot find in Heliopan or Aliexpress. Maybe I could make the coupling with 1 step up (43 to some size) and 1 step down (some size to 43) adaptor?

[JKT]

That is often necessary. It will increase the distance between lenses and that increases the danger of vignetting, but other than that, there should not be a problem.