Re: OT: Autofocus?

Oliver:
Autofocus SLRs give you a choice of sensors positioned across the viewfinder. Canon's EOS 1D family has 41 sensors in an oval at the center of the frame. The EOS 20D and 30D have 9 sensors - one dead center, and eight others at the 30 and 60% points around the frame.

You choose which sensor you want the camera to autofocus with, or let the camera's firmware choose it. AF cameras have dials or small joysticks for this. At fairly close distance, I pick the sensor that's over the subject's eye, (usually) gives him room to move into the frame, and (usually) avoids bulls eye centering of the subject.


At 01:45 PM 7/30/2006, you wrote: 
Mark wrote:

"Oliver:
I use AF all the time for mountain bike racers and wildlife. Some on
this list have great manual follow-focus skills, but I'm not so
fortunate. Good AF on Canon's L-lenses for EOS 1D mk II / 20D/30D, or
Nikon's EDIF lenses for D2H/D2X/D200 work very well for fast-moving
subjects.

You need to choose your AF sensor in the camera for the composition
you anticipate. Otherwise you end up with lots of bullseye-centered images.

Here's a friend's son throwing me a soccer ball - it shows you what's
possible with Canon EOS equipment:
http://tinyurl.com/93ejr

And here he is with Nikon gear:
http://tinyurl.com/73q4x "

Thanks, Mark, for a very helpful description. Could you please elaborate on
choosing the AF sensor in the camera? I'm partial to 50mm or 35-70 lenses.

Jim wrote:

"Oliver, you have a scanner. I think your original premise is the
correct premise - shoot film, scan film. Archive the film, print the
scan. Your great great great grandkids will still be able to recover
the images from the film. Not true if someone does not migrate
digital images forward to the latest technology."

It's a major reason why I have stayed with film (another one is sheer
stubbornness).

My daughter, who bought a digital Nikon to take on her trip to Italy (and
didn't read the manual), has agreed to lend me her 5-year old film Nikon
with a short zoom and AF. I'll report on my experience in due course. Except
for my Hasselblads I haven't used an SLR for almost 20 years.

Thanks again to everyone who responded to my posts!

Oliver



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Mark Bohrer
Precision Copywriting
www.precision-copywriting.com
(408) 866-9405

I write technical copy in plain language
to get CEOs buying from you 


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