Canon EOS 40D Official White Paper...

Canon EF 24-70mm f/2.8L USM

09/17/2007 05:22:09 PM · #1

Here's the official "White Paper" on the new Canon EOS 40D, for those of you interested.

The sections are as follows:

- Overview
- Summary of New and Improved Features
- Performance
- Convenience
- Software
- Accessories and Lens
- Specifications
- Feature Comparison (between the 40D and 30D)
- Conclusion

dwterry

Canon EOS-1D Mark III

09/17/2007 08:35:44 PM · #2

That was very helpful. Thanks for sharing.

skylercall

Canon EOS-7D

09/27/2007 12:07:24 AM · #3

At the top of page 8 it discusses the Auto ISO feature.

Can anyone explain why this is a good thing? I have been reading that you are not able to set the ISO at 100. I am particularly confused about Manual mode. The diagram says that ISO is fixed at 400.

09/27/2007 01:01:33 AM · #4

I found this interesting from a technical/mechanical point-of-view:

"Of considerable importance, the EOS 40D uses a 2-motor system, one dedicated to driving the mirror, and one dedicated to cocking the shutter speedily. Also, a stopper is incorporated to prevent the rebounding or bouncing of the main mirror and secondary mirror. This results in shorter viewfinder blackout and a more stable viewfinder image during continuous shooting."

Canon EF 24-105mm f/4.0L IS

09/27/2007 01:09:07 AM · #5

Originally posted by skylercall:

My interpretation is that if you are in one of the following modes:

P, Av, or A-DEP

then the ISO will range from 100-800. It starts at 400 to 800, but if overexposure will result at ISO 400, a lower ISO speed, as low as ISO 100, is set.

If you are in one of the "Basic Zone" modes, then the range is 100 to 800.

If you are in "Portrait" mode, it is automatically set to 100.

I, personally, have never used one of the Basic Mode settings in any camera that I've ever owned. As my moniker states, I'm mostly use Av mode.

scalvert

Canon EOS-5D Mark III

09/27/2007 01:11:37 AM · #6

Originally posted by skylercall:

Can anyone explain why this is a good thing? I have been reading that you are not able to set the ISO at 100.

I haven't read the paper, but I think that ISO200 minimum in certain modes is related to a new feature that helps protect highlight detail. The camera uses the extra latitude of ISO100 as sort of a safety net if your settings would result in overexposure. Just a guess.

The ISO is NOT locked at ISO400 in manual, though. You can set it to whatever you want.

scalvert

Canon EOS-5D Mark III

Canon EF 24-105mm f/4.0L IS

09/27/2007 01:12:45 AM · #7

Originally posted by AperturePriority:

As my moniker states, I'm mostly use Av mode.

Few people will admit to being shallow. ;-)

cpanaioti

Canon EOS-40D

Canon EF 70-300mm f/4.5-5.6 DO IS USM

09/27/2007 01:13:28 AM · #8

Originally posted by scalvert:

The ISO is NOT locked at ISO400 in manual, though. You can set it to whatever you want.

I think what the chart is showing is that if ISO is set to AUTO and shooting mode is set to Manual then the ISO will be locked at 400.