> But none of these are IS, as Skip was referring to
>
> Tom P.
Tom,
Missed the IS part. As Rosanne Rosandana would say, never mind!!
Darrell
[EMAIL PROTECTED]
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"F. Craig Callahan" wrote:
>
> Thomas Bantel wrote:
>
> > While, with an extension tube, the nominal max aperture communicated
> > to the lens will not change, the effective max aperture will. So this
> > means, an extension tube will not prevent the camera from *trying*
> > to AF, but it will l
Thomas Bantel wrote:
> While, with an extension tube, the nominal max aperture communicated
> to the lens will not change, the effective max aperture will. So this
> means, an extension tube will not prevent the camera from *trying*
> to AF, but it will lower the efficiency of AF just like usin
Bob Talbot wrote:
>
> > Therefore, while technically the aperture does not
> > change, for metering and AF purposes the "effective aperture" does
> > change, since less light reaches the sensors. Since with AF what
> > matters is the amount of light that reaches the sensors (no?),
>
> Mmmm...
>
> "why would an extension tube change the aperture?".
It's the same skool of exelence (sp?) that teaches that focal length
varies with film format ;o)
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*http://w
"F. Craig Callahan" wrote:
> Since with AF what matters is the amount of
> light that reaches the sensors (no?), an extension tube could have an affect on
> AF performance. Correct? No?
Yes and no. It's not just the amount of light that matters, a larger aperture makes
it easier for the camer
l Message -
From: "Bob Talbot" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, January 17, 2001 12:10 PM
Subject: Re: EOS 28-135 IS "macro"
>
> Arrg
>
> Not again!
>
>
> An extension tube
Therefore, while technically the aperture does not
> change, for metering and AF purposes the "effective aperture" does
change, since
> less light reaches the sensors. Since with AF what matters is the
amount of
> light that reaches the sensors (no?),
Mmmm...
I'm not sure: I expect it is a func
Bob Talbot wrote:
> Arrg
>
> Not again!
>
>
> An extension tube DOES NOT change the aperture.
> If it really was f4 before; it remains f4.
>
Ok Bob, calm down. :-)
I wasn't writing in a technical sense (indeed, I made a half-hearted effort not
to get caught up in this issue
Tapani Tarvainen WROTE:
That is strange. I have never used an Elan IIe so I can't say how well
it works with it, but after reading your note I dug up the lens, tube
and every EOS body I could find, namely EOS 3, EOS 5 and EOS 300 and
tried it with all of them, and none could focus even remotely u
On Wed, Jan 17, 2001 at 09:55:32AM -0800, Kotsinadelis, Peter (Peter) wrote:
> > One nice thing to consider, an extention tube gets you closer
> > and with IS you can actually handhold the lens and get some nice
> > macro shots without a lot of setup. And for those worried about
> > AF, even wit
On Wed, Jan 17, 2001 at 12:07:33PM -0500, F. Craig Callahan wrote:
>
>
> "Kotsinadelis, Peter (Peter)" wrote:
>
> > One nice thing to consider, an extention tube gets you closer
> > and with IS you can actually handhold the lens and get some nice
> > macro shots without a lot of setup. And for
> It is likely that this is because the extension tubes don't "tell"
the body
> about their presence the way the extenders do, so the AF system
doesn't "know"
> that it's working at f/8 (at the long end).
Arrg
Not again!
An extension tube DOES NOT change the aperture.
If it re
F. Craig Callahan wrote:
"Kotsinadelis, Peter (Peter)" wrote:
> One nice thing to consider, an extention tube gets you closer
> and with IS you can actually handhold the lens and get some nice
> macro shots without a lot of setup. And for those worried about
> AF, even with an Elan IIe and a 25
"Kotsinadelis, Peter (Peter)" wrote:
> One nice thing to consider, an extention tube gets you closer
> and with IS you can actually handhold the lens and get some nice
> macro shots without a lot of setup. And for those worried about
> AF, even with an Elan IIe and a 25mm extention tube, AF st
Ken Durling wrote:
Could I ask for a brief expalanation? I've heard so much about the
28-135 IS lens that I was trying one out in a store today. (very nice
handling lens) I noticed that on the focusing ring at the .5 meter
end it says "Macro," and that the focusing window also has a macro
ran
You're right on the image ratio, I think, I was just estimating from
images I had taken. But the 75-300 IS front element definitely does
rotate. It is of the micromotor persuasion.
Skip
--
Shadowcatcher Imagery
http://www.shadowcatcherimagery.com
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--- Skip <[EMAIL PROTECTED]> wrote:
> Macro, in this case, is a marketing term. It
> produces images slightly
> better than 1/2 life size, so I guess that counts.
Are you refering to the 28-135IS? The only Canon lens
that I know that offers 1/2 life size is the 50mm
macro. All others are approx
Darrell Dorsey wrote:
>
> AFAIK, the 75-300 is the only non ring USM IS lens in the line.
> > I think the 28-135 is a great lens, I've gotten some great results from
> > it, and not just because of the IS.
> > Skip
>
> Skip,
>
> There are many more Micro-motor USM lenses than the 75-300USM. Mo
But none of these are IS, as Skip was referring to
Tom P.
- Original Message -
From: "Darrell Dorsey" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, January 16, 2001 9:07 PM
Subject: Re: EOS 28-135 IS "macro"
> AFAIK, the 75-300 is t
AFAIK, the 75-300 is the only non ring USM IS lens in the line.
> I think the 28-135 is a great lens, I've gotten some great results from
> it, and not just because of the IS.
> Skip
Skip,
There are many more Micro-motor USM lenses than the 75-300USM. Most of the
low end USM lenes are Micro-mot
Ken Durling wrote:
>
> Could I ask for a brief expalanation? I've heard so much about the
> 28-135 IS lens that I was trying one out in a store today. (very nice
> handling lens) I noticed that on the focusing ring at the .5 meter
> end it says "Macro," and that the focusing window also has a
Could I ask for a brief expalanation? I've heard so much about the
28-135 IS lens that I was trying one out in a store today. (very nice
handling lens) I noticed that on the focusing ring at the .5 meter
end it says "Macro," and that the focusing window also has a macro
range. However, hte le
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