To expand: WA converters fall mostly into two catagories:
"zoom-through", which maintains original lens focus, and
"non-zoom-through", which does not, and which is a much simpler optical design that generally uses the
macro-focusing range of the lens (usually best at
the short end of the zoom range) for focus to infinity.
"Zoom-through" types will allow infinity-focus throughout
the zoom range, but depending on its optical quality AND
how well it optically matches the lens it's on AND the
optical quality of the lens it's on, it may or may not look
sharp on a particular lens, especially at the zoom lens
FL extremes, and at the edges and corners at the lens short
end at wide stops. As for 2:1 - it is not much of a 10:1
(or so) zooming range at all... But better to have good
wide-angle capability with little zooming range than
so-so lens performance with wider zooming range, I think...
I use both types, but most zoom-through types degrade
the image more than the non-zoom-through types - the
exception has been the Canon WD-58 .7X on the VX-2000 (and
a very recent Kenko .5X model on the VX-1000).


On Sat, 03 Feb 2001 13:56:06 GMT, xyz@hotmail.com (xyz) wrote:
>Which explains why I get a blurry image when I really zoom in. I'll
>take a look at a zoom-thru lens. I wonder if Sony makes one? By the
>way, where in the zoom range would a 2:1 ratio be? Somewhere in the
>middle between W and T? 3/4 from the W side (W x T)?

>On Sat, 03 Feb 2001 04:25:14 GMT, d_ruether@hotmail.com (Neuman - Ruether)
>wrote:
>snip
>>It is not "zoom-through", which means only about 2:1
>>zoom before losing all ability to focus on anything.