[Dennis]

Originally Posted by spearo

Thanks Dennis,
I still don't know what I should say about the focal length: The C14 is an F11 so when I put the the 6.3 focal reducer on does it make it 6.3 or 7.3 ?
????
cheers
frank

Whoops – thanks Frank, I did my calculations based on F10 so at F11, you are closer to 2500mm!

I think an x0.63 reducer will make an F11 system an F6.93 system?

Cheers

Dennis