> I would have guessed that the auto focusing time could be slightly
> affected/longer with sr on, there must be a reason for the off 
> switch.

The manual states to switch SR off when using the camera tripod mounted, I'll 
be switching it off when panning moving subjects like World Superbike racers 
etc.

John 

---------- Original Message -----------
From: "Markus Maurer" <[EMAIL PROTECTED]>
To: "Pentax-Discuss Mail List" <pdml@pdml.net>
Sent: Sun, 26 Nov 2006 06:24:25 +0100
Subject: AW: AW: Pentax 1.8 85mm

> Hi Ken
> thanks for your quick and precise answer :-)
> I would have guessed that the auto focusing time could be slightly
> affected/longer with sr on, there must be a reason for the off 
> switch. Since I still use film, it's all only speculation from my side...
> greetings
> Markus
> 
> -----Ursprungliche Nachricht-----
> Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Auftrag von
> K.Takeshita
> Gesendet: Sonntag, 26. November 2006 05:17
> An: Pentax-Discuss Mail List
> Betreff: Re: AW: Pentax 1.8 85mm
> 
> On 11/25/06 10:43 PM, "Markus Maurer", <[EMAIL PROTECTED]> wrote:
> 
> > This may be a stupid question but does SR/IS have any negative side
> effects?
> 
> If properly implemented, there should be no appreciable side effects 
> on either system (SR or IS). In theory, whenever any lens group is 
> added, such as in the case of IS, it is one more element of image 
degradation.
> Canon has a few lenses in both IS  and non-IS versions and I do not
> recollect any articles which say one is superior to the other, but 
> then I am not really a Canon user and do not monitor their lists 
> etc. Looking at the diagram of Canon's IS implementation, it looks 
> an assembly of small lenses, gyro and other small parts and feel a 
> bit fragile (resistance against shock etc).
> 
> In-body implementation (SR) seems mechanically sturdier and robust.
> Other than that, I have not experienced any negative side effects on 
> Canon IS.  It really saved me a lot of difficult shots.  Initially,
>  I felt like I was dependent on IS in certain situations, but now I 
> consider either SR/IS just another tool, and far less dependent on 
> it except in real low light or telephoto situation. I am too lazy to 
> lag around tripod, or put on external flash all the time, and SR/IS 
> are really handy for people like me :-).
> 
> Perhaps other people have different experiences including some 
> negatives, but I think SR/IS are great features.
> 
> Ken
> 
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