----- Original Message -----
From: "Vadim Kouzmenko" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, April 02, 2001 10:52 AM
Subject: RE: EOS Re: IS vs. non-IS Sharpness (300/4L)
> > Yes, I realize they are calculated, but sorry, I don't buy
> > that they would
> > fabricate graphs just to improve their sales.
>
> Well, I didn't say that Canon fabricates graphs.
No, you didn't, but I think it could be interpreted from your statement "it
is obvious that Canon earns money on non-IS to IS upgrades"
>
> My point is:
>
> Canon doesn't publish actual measured MTFs. They provide only
> projected MTF obtained from CAD software. Credibility of such
> MTF comparison tests is low because:
>
> a) they are not obtained from real physical experiment;
>
At least it gives the theoretical limit of what a lens is capable of.
I still don't think it is a worse representation than giving the practical
results for a single lens on a single day.
> b) It doesn't seem that Photodo have bias towards any particular
> vendor or product (unlike PoP which could claim that Tamron 28-300
> is almost as "crisp" as 300/2.8L)
Now that is true.
>
> 300/4 and 300/4IS are both excellent lenses.
> According to many sources, non-IS is a bit sharper than the IS.
> If you need IS or need smaller closest focusing distance: go for 300/4IS.
> If you use tripod or don't have budget for IS: go for 2nd hand non-IS (as
I
> do :) ).
I think we are basically in agreement here, and if there really is a
difference in performance, I think it would probably be barely noticeable in
real world application. I think the non-IS is a very good lens and provides
very good value for money, but the IS version is definitely more useful IMO
and worth saving a bit extra for.
Regards
Thys
---------------------------------------------------------
Thys van der Merwe
Portfolio of African Images:
http://home.mweb.co.za/te/teknovis
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