Even the best tele-converters do not work well until you
stop the lens down quite a bit. If you stop the lens down to
f8 (gives f16 with a 2x converter) or smaller they usually
work ok.
--Tom
Kevin Thornsberry wrote:
>
> I had a similar experience with my A*300/2.8 w/ the 2x-s. I have since verified
>that I can take sharp pictures with this setup but I don't know what the problem was.
> I was focussing near minimum distance, near wide open on Supra 400. My PUG entry
>this month is one of the offending "softies".
>
> My retest was also near minimum distance but with the lens set to f/8 and the film
>was supra 100.
>
> Both the problem roll and the retest were take from a sturdy tripod.
>
> Would the 2x-L do better? Is this combo known to be soft when wide open? Anyone
>know?
>
> -----Original Message-----
> From: Dave Weiss [SMTP:[EMAIL PROTECTED]]
> Sent: Wednesday, July 11, 2001 7:48 PM
> To: pentax-discuss
> Subject: TC--I am frowning!
>
>
> Hi all;
>
> Well, just got pics from my trip out west (Badlands, Custer, Estes, Arches,
> Garden of the Gods) and I am happy with the results EXCEPT
>
> it seems to me that when I was using the TC (kT6-2x) coupled with my a50f1.4
> I got really blurry pictures, like worse than a good pocket camera. No
> where are the pictures in focus. What gives? I thought this to be a good
> TC. Could I be focusing incorrectly? This was done on a super program. I
> did notice that when using the TC, the infinity focus is not where it
> normally is, that is, using the focusing prism, you would end up say,
> focusing to 50 ft (per the lens markings) instead of at the infinity symbol.
> Is this normal? Does anybody have an example using a TC that I can compare
> mine to?
>
> I am especially unhappy because today I used said TC combo (before I got my
> vacation pictures back) to take some HIE pictures of tall ships parading
> around the breakwall in Cleveland that I hope are not all blurry.
>
> I will be testing my theory this weekend but would appreciate any
> info/opinions in the meantime.
>
> thanks
>
> dave
>
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