Query regarding 2x Komura extender for 500 series lenses

[Bogdan Karasek]

Hello,

I have a question regarding the 2x Komura extender. Is there a general consensus regarding the quality of the extender? The good and the bad of the extender?

I was thinking that it would be useful on my 80mm Planar and 120 Planar, giving me a 160mm and 240mm.
Is it worth spending the money?
I believe I would have to compensate with 1 f stop?????

Thank you!

 

[blowupster]

well, why not. Not one stop but 2. Your 80mm becomes a 160mm/5.6 !
I have one I do not use since I get Zeiss 1.4x
Sell for 70 euro.