If your tube is an 01F then it is actually an SP 2X converter with 6 glass
elements, that will double the effective focal length to 180mm.
mvh / regards
Roger Key
My tube is the 01F so that must explain the difference. It shows f stops
from f 2.5 to a ridiculous f 84!
Gregg
.......
>
>Also just for info the 18F tube for the lens doesn't have a new f stop
>ring on it.
>
>
>Thanks,
>
>Jeff Bellin
>Newton, MA
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