The 40D Live View Mystery -=READ THIS=- Before posting re Live view

Just bought a 40D tonight and not only came with a manual but came with two, one English and the other Spanish and same with pocket guide... NY here

Chris

Actually if anyone needs the Spanish versions i would be happy to mail to them as i will not be needing them

Chris

hvphotog wrote in post #4709800
Actually if anyone needs the Spanish versions i would be happy to mail to them as i will not be needing them

Chris

Oido cocina !!!

The spanish version of: Listen kitchen !!

Would you be so kindly to send one to Spain or it will be costly for you ? If it is,dont worry, thank you for intention.

This helps me a lot! Thanks!

apersson850 wrote in post #4668410
Finally, I'd be interested in seeing an explanation for why it would be smart to cover the eyepiece when using live view? When not, yes, to avoid stray light entering the light metering backwards through the viewfinder, but in liveview the mirror is up (that's what it's all about!), so the light metering is done by the sensor!

I feel the same way. In Live View mode, with metering based on the sensor's output, I see no reason to cover the viewfinder eyepiece.

Shame you have to MF when tethered to a pc.

It is known that in LV mode, the AF is based on the main picture sensor (not on the Focus Sensor), and is based on a 'Optimized Contrast' algorithm (rather than on a 'Optimized Phase' algorithm used w the Focus Sensor in normal mode).

It is also known that Contrast based focus algorithm is SLOWER than Phase based. Do you experience the same ?

roli_bark wrote in post #4798154
It is known that in LV mode, the AF is based on the main picture sensor (not on the Focus Sensor), and is based on a 'Optimized Contrast' algorithm (rather than on a 'Optimized Phase' algorithm used w the Focus Sensor in normal mode).

It is also known that Contrast based focus algorithm is SLOWER than Phase based. Do you experience the same ?

The 40D autofocus in live view is done by dropping the mirror and focusing using phase detection. The new 450D will offer contrast detection, which is slower, but doesn't involve the mirror dropping (hence no screen blackout). So you can ask again after the 450D is released in late March

BogongBreeze wrote in post #4798546
The 40D autofocus in live view is done by dropping the mirror and focusing using phase detection. The new 450D will offer contrast detection, which is slower, but doesn't involve the mirror dropping (hence no screen blackout). So you can ask again after the 450D is released in late March

Sorry, I do not agree !.

To the best of my knowledge, Phase-Detection focus CANN'T be done with main picture sensor [while the main mirror is folded up] .

The main picture sensor lacks the double focus elements to do Phase-Detection - which only exist in the dedicated Focus Sensor.

Great Thread.. Good Sticky...

When I bought the camera, the salesperson told me that I COULD NOT Autofocus in Live View. I called him 3 hours after I bought the camera and taught him how to do it.....

roli_bark wrote in post #4806158
Sorry, I do not agree !.

To the best of my knowledge, Phase-Detection focus CANN'T be done with main picture sensor [while the main mirror is folded up] .

The main picture sensor lacks the double focus elements to do Phase-Detection - which only exist in the dedicated Focus Sensor.

I thought that was exactly what I said

The 40D has to drop the mirror again and uses it's normal AF in live view. The Xsi will use contrast detection and won't drop the mirror.

I think we agree

apersson850 wrote in post #4668410
(saves on sensor heating)

Is this (heat) an issue while using LV on the 40D? I read something somewhere saying using LV was bad for the sensor and have avoided using it at all because of that.

Higher sensor temperature is bad for the image quality. Random noise in electronic devices becomes worse with increasing temperature. But the heat doesn't harm the sensor itself. Not at the levels we are talking about here. As soon as it has cooled down, it's back to where it was.
The 40D will prevent live view, if the sensor temperature is too high to give good quality images.

Those interested in star photography often prefer taking pictures in the winter, as a cooler camera has less noise, and noise is a big enemy with the long exposure times as astronomy often implies.

*** I just found out that Canon Europe has published online manuals for the 40D on Youtube. Here's a section about live view.

A measure of clarification on a prior post on the use of IS with a tripod .... it depends on the lens:

http://www.dlcphotogra​phy.net/TripodAndIS.ht​m

Do these instructions apply to the 1D Mark III in LV mode?
Will auto focus work in LV?
Thanks,
WSpruance