[OM] Re: spam: Re: Vivitar Automatic Tele Converter 3X-21

[Wayne Harridge]

> 
> That's why pros like 1.4x converters - that's only one stop. A 3X is  
> probably more than three stops it occurs to me, given that  
> relationship but I'm not sure. They are not that popular. 

3x the focal length, 3x the maximum aperture, so an f4 becomes f12, slightly
more than 3 stops (which would be f11).

...Wayne



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