EOS-Digest wrote:
>
> EOS-Digest Thursday, April 12 2001 Volume 00 : Number 1604
>
> ***********************************************************
> Date: Thu, 12 Apr 2001 09:48:44 -0300
> From: [EMAIL PROTECTED] (Terry Danks)
> Subject: Re: EOS EF 85mm f1.2L Weight
>
> > The lens is FTM, there is no need to tick the trigger
> > to be able to focus. As long as the camera is not off,
> > rotating the EMF (Electro Manual Focussing) sensor ring
> > directly focusses the lens.
>
> Michael: In that case, there appears to be something wrong with mine.
> I USUALLY can not focus it manually if the meter is not active.
Where do you start AF? Trigger or rear button?
Possibly this has an effect as well. My bodies all
have AF-start on the rear button.
> > You are not really saying that you use AF in
> > a macro lens, are you?
>
> Why not, at least on occasion?
In close-up and macro ranges focussing makes little sense.
You just set the enlargement ratio with the tube movement.
> And yes, for butterflies
Oh, I see. This is not very macro to me.....
> Again, there clearly must be something wrong with mine.
> It does NOT reliably focus manually unless the meter
> is active.
Check the AF start button, please. Maybe that's it.
> The 300/2.8 focuses manually whether the body is turned on or
> off BTW. THAT, I call true FTM focus!
The 85 has no mechanical coupling, it has a rotation
sensor that tells the lens which way to focus.
> I fail to see why it can not focus as quickly as the 300/2.8.
The 300 uses internal focussing, the 85 moves a lot of glass.
The M1 USM motor draws one full Watt of power.
> I could have chosen this lens for action shots at a horse meet.
Then you'd be set on a pretty much controlled distance, because
horses look good, when they take a certain area in your picture.
They don't look too good very far away and not very good when
cropped in a way that amputates their legs....
So, pre-focussing and simply triggering at the right point would
mostly do the job. Aside of that a lens like the 28-135 IS might
be better suited for horse jobs.
> Why this lens is so slow to AF I do not understand.
The lens is made with a very wide spread focussing range
to allow for very fine adjustments with that very shallow
depth of field that 1.2 delivers. Since this lens is used
at smaller distances than a 300 mm, even small adjustments
dramatically influence the image.
> It does not have the long throw distance required in
> macro designs
But it has a much finer focussing than most others.
> and certainly does not likely move a greater mass of
> glass to focus than do the super teles which focus all
> but instantly!
Yes, it does. It moves the whole front group, while
the superteles all have internal focussing.
> I will concede that there appears to be a problem with
> my particular 85/1.2 if yours FTM's reliably when the
> shutter button is not "ticked." This one never did.
Again, just check the AF start button set on the rear
button.
> About the slowness of its AF, we'll just have to
> disagree.
No problem. What works for me must have no
effect on what works for you.
--
Michael Quack <[EMAIL PROTECTED]> http://www.photoquack.de
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