FWIW - I use the 1.4X-S on my 300mm f4.5 FA and the 1.4X-L on my 600mm FA. 
The long snout on the X-L precludes use on the 300, but I could fit the X-S 
to the 600. I've never tried that so I don't know the results.

Kenneth Waller

----- Original Message ----- 
From: "Mark Cassino" <[EMAIL PROTECTED]>
To: "Pentax-Discuss Mail List" <[email protected]>
Sent: Monday, January 29, 2007 6:43 PM
Subject: Pentax TC Question


> By chance I took a look at B&H's page on the Pentax 1.4x-L teleconverter
> today. There's a list of compatible lenses, but several are marked as
> "Fits, but better performance can be achieved with other versions." I
> assume these are lenses that would work better with the 1.4x-S converter.
>
> I was surprised to see the A* 400 f2.8, F* 600 f4, and A* 600 f 5.6 on
> this list.  Oddly, the FA* 600 f4 is not so noted.
>
> See -
>
> http://www.bhphotovideo.com/bnh/controller/home?A=details&Q=&is=USA&O=productlist&sku=40608
>
> and click on the features tab.
>
> I mostly use the 1.7x AF adapter with my A* 400, but bought the 'L' TC's
> for use with it. Any thoughts on whether the S is really better with
> some of the long glass?
>
> - MCC
>
> -- 
> - - - - - - - - - - - - - - - - - - - -
> Mark Cassino Photography
> Kalamazoo, Michigan
> www.markcassino.com
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