Medium Format Forum

Register a free account now!

If you are registered, you get access to the members only section, can participate in the buy & sell second hand forum and last but not least you can reserve your preferred username before someone else takes it.

Best 2x extender Komura Vivitar or Kenko


Does anyone know whether any of the Komura, Vivitar or Kenko (or any of the other third-party models (Rokunar?)) 2x extenders are better than the others?

Are they all made by the same company and just have different labels?
I found interresting tests and comments at
page 9 is about Komura teleconverter. I do have one and I am still testing with a F/4 150mm. So far results are quite acceptable even though less sharp then what I get with the 150mm alone.
I got my used Komura for 100Euro, prices sometimes fly up, I recently found a used one for 320euros.