Like you, I initially had the same concern, but after checking with Pentax
Colorado, I obtained the 1.4X-S and have had no noticeable problems with it.
I can't tell the difference in image quality from this lens with or without
the convertor. I'm talking actual field results with the unaided eye or an
8X loupe. I haven't done any objective testing on this lens or this
combination. I do think the extra cost over a generic convertor is worth it,
of course this is totally subjective on my part. Hope this helps..
Ken Waller
----- Original Message -----
From: Alan Chan <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, March 29, 2001 11:00 PM
Subject: Re: Pentax-FA* 300mm f/4.5 Telephoto ...
> I have checked the Pentax lens brochure which printed only the A2X-S is
> compatible with the FA*300/4.5. Since you said you had used the A1.4X-S
with
> this lens, does it provide pin sharp result (especially at wide open)
> without any mechanical incapability? How about vignetting? I would like to
> buy one for my F*300/4.5 but concerned it might be incompatible. Your
> comment would be helpful.
>
> regards,
> Alan Chan
>
> >Alex, I've had the 300mm f4.5 FA lens for several years now and use it a
> >lot
> >by itself and with a Pentax 1.4 XS convertor. I have had absoluely no
> >problems with it and am very happy with the results I get. It produces
> >sharp
> >images (I mostly shoot it from a tripod) and has a robust feel to it. Yes
I
> >would like a tripod mount on it but it did not deter me from buying it
and
> >I
> >would do it again. For serious field use you really have to be concerned
> >about the weight you are carrying around and for 300mm this lens is
light.
> >When you consider the cost and weight of the 300mm f2.8, the f4.5 is a
> >tremendous lens. Hope this helps.
>
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