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Re: [OM] reasonably priced 3Ti 270400363196 you know where

Subject: Re: [OM] reasonably priced 3Ti 270400363196 you know where
From: "C.H.Ling" <ch_photo@xxxxxxxxxxxxx>
Date: Thu, 11 Jun 2009 23:29:04 +0800
I agree with you all modern zoom lenses do not adjust focuse distance with 
zooming but not all of them maintain focus either, try your Canyon zooms, 
they only calibrated at the long end.

C.H.Ling

----- Original Message ----- 
From: "Dawid Loubser"

> Any of the zoom lenses with a focusing scale inside a window
> on the lens is guaranteed to be - is the term "parfocal" ?
>
> If the lens in question did not maintain focus when it zoomed, the
> focus distance scale would move when zooming. I have not seen a single
> Canon lens do this.
>
> I am surprised that you say the 50-200 fails - I have access to one, I
> will
> also check it out... But I repeat, almost all modern zoom lenses do not
> adjust focus distance with zooming.
>
> On 11 Jun 2009, at 4:57 PM, C.H.Ling wrote:
>
>> I have different experience, the Canyon 28-135 IS I once owned does
>> not
>> maintain focus (very serious, more than 4mm on the scale from 28 to
>> 135), I
>> send it to Canyon repair center and they spent two weeks to tell me
>> this is
>> normal. I also had tried a Sigma 17-35 it also can't maintain focus,
>> you
>> simply can't use the distance scale. The Tamron AF 70-300 was
>> better, only
>> sligthly off.
>>
>> I don't have experience on other Canyon, I had the 17-40 but without
>> live
>> view at that time and with the lousy focusing scale I don't know if
>> it can
>> maintain focus or not.
>>
>> For Olympus, after getting the E-3 with live view, I found the
>> following:
>>
>> 14-45 - ok
>> 40-150 3.5-4.5- ok
>> 11-22 - failed
>> 50-200 - failed
>>
>> C.H.Ling

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