20D Settings Inconsistency

On Thu, 19 May 2005 16:00:55 GMT, "WormWood" wrote:

I'm very confused by this and cannot find an explanation.

I have a 20D with a Canon 70-200 f4L lens attached.

The following was done zoomed to 200

One: Using the Basic Zone setting of Sports, I aim at a given outdoors area
and it shows the camera is going to take a picture using a shutter speed of
1/2000 at f7.1 The end result is a decent picture.

Two: Using the Creative Zone setting of Tv and setting the shutter speed to
1/2000, the lcd indicates a wide open aperture of 4.0 is insufficent, and
the resulting picture *is* underexposed.

Three: Using the Creative Zone setting of Av, and setting the aperture to
7.1 results in the camera setting the shutter speed to 1/500 of a second,
and taking a perfectly acceptable picture.

I can, to some degree, understand the different shutter speed selections
between 'One' and 'Three'. As I understand it the camera is deciding (in
Three) that at f7.1 a shutter speed of 1/500 will produce the 'best'
picture...so no big deal there.

What has me totally boggled is why a shutter speed of 1/2000 of a second in
situation 'One' is so very different from a shutter speed of 1/2000 of a
second in situation 'Two'. The resulting picture in 'Two' is unusable unless
it were to be tweaked in Photoshop or something similar.

WW



I've never seen the camera, but could the "Sports" mode have been using a
higher ISO than in the creative modes? Also, what was the weather like?
Did/could a lump of cloud have drifted over between the first and later
shots?

Just thinking aloud.

Regards,
Graham Holden (g-holden AT dircon DOT co DOT uk)
--
There are 10 types of people in the world;
those that understand binary and those that don't.

"Graham Holden" wrote in message
...

I've never seen the camera, but could the "Sports" mode have been using a
higher ISO than in the creative modes?

That's exactly what it was doing Graham. Sometimes auto stuff is a pain in
the butt...as a result of this snafu I have been motivated to play with the
Crative Zones (bye bye auto stuff) on this camera...and am finding them
useful and interesting. I am slowly, but surely, climbing this learning
curve.

WW

Some quirks of the 20D a

In sports mode it will automatically select a film speed of 1600 ot 3200.

I thought it was set to ISO 400 in Sports mode. Can you provide a link or
documentation?

"Charles Schuler" wrote in message
...

snippage

I thought it was set to ISO 400 in Sports mode. Can you provide a link or
documentation?


I just checked my manual, and I quote:

"ISO Speed in the Basic Zone Modes"
"The ISO speed is set automatically within ISO 100-400"

and...Sports is one of the settings within the Basic Zone

so....Douglas is mistaken when he says 1600 or 3200

WW

In message ,
Graham Holden wrote:

I've never seen the camera, but could the "Sports" mode have been using a
higher ISO than in the creative modes? Also, what was the weather like?
Did/could a lump of cloud have drifted over between the first and later
shots?

Just thinking aloud.

I just put my 20D in sports mode (I have never had it in any of the
basic modes before), and pointed into a dark corner of a dark room, and
it took an ISO 400 image.
--


John P Sheehy