I'll just try a couple of your questions. 3) the xL is to be used only
on 300mm or longer lenses wherein it intrudes into the rear of said
lenses. 
It contains more expensive 'low dispersion' elements for an improved
image.

4) I would think a "very good" A 70~210 f/4 could be had from a photo
house for somewhere around $100 US.

Hope helpful.

Jack
--- Russell Kerstetter <[EMAIL PROTECTED]> wrote:

> 1) Is Asahi to Pentax as Nikkor is to Nikon?  If so, then what is
> Takumar?
> 
> 2) A salesman at a store told me that I can use 67 lens' on my istDL,
> is this true?  If so, how well does it work?
> 
> 3) What is the difference between the Pentax xl and xs
> teleconverters?
> 
> 4) How much should I expect to pay for an A70-210/4 in good condition
> (not mint, not trashed)?
> 
> Thanks for helping out the newb.
> 
> Russell
> 
> 


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