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Cameras, Lenses and Accessories: Discuss Things you never knew your camera could do......I had some crud on my sensor (Canon 40D) so thought I'd give it a clean. Select Sensor Cleaning in ...
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Old 27-03-2009, 11:07   #1 (permalink)
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Things you never knew your camera could do...

I had some crud on my sensor (Canon 40D) so thought I'd give it a clean. Select Sensor Cleaning in the menu and up pops a message "Battery too low for Cleaning". Never seen that before but helpful

If you have any tips about your camera feel free to append them here, don't forget to mention the camera name and model.
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Old 28-03-2009, 10:50   #2 (permalink)
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Re: Things you never knew your camera could do...

I have discovered that my new EOS 5D Mk II has "Face Detection". Has anyone tried this and does it work?

For studio portrait photography, I had settled on using the centre focus point only to focus on the eyes then recompose to take the shot which is accurate and quick on my 20D. At the last Studio session, using my new camera, I tried multi-point focusing again and found that almost 1/3 of shots were not accurately focussed. I then discovered that DPP will display the active focusing points which revealed why the focussing was inaccurate in some cases. As a result I am now back to single point focussing. So can someone say anything to encourage me to use Face Detection but remembering in a Studio situation that we are snapping away very quickly.
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Old 28-03-2009, 12:38   #3 (permalink)
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Re: Things you never knew your camera could do...

Found been able to scroll throu images using sub dial rather than one by one using multi point selector on D300 discovered on tut on net, yet i cant ever see this listed in the manual Plus been able to overlay images in camera
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Old 28-03-2009, 14:16   #4 (permalink)
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Re: Things you never knew your camera could do...

Quote:
Originally Posted by Dave Canon View Post
I have discovered that my new EOS 5D Mk II has "Face Detection". Has anyone tried this and does it work?

For studio portrait photography, I had settled on using the centre focus point only to focus on the eyes then recompose to take the shot which is accurate and quick on my 20D. At the last Studio session, using my new camera, I tried multi-point focusing again and found that almost 1/3 of shots were not accurately focussed. I then discovered that DPP will display the active focusing points which revealed why the focussing was inaccurate in some cases. As a result I am now back to single point focussing. So can someone say anything to encourage me to use Face Detection but remembering in a Studio situation that we are snapping away very quickly.
I prefer single-point focusing and my 40D doesn't have face detection (which I don't miss!).

There is, however, a potential problem with using the centre focus point and recomposing. It's easier to explain with a diagram, but I'll try anyway...

Imagine you are using a wide-angle lens and are at right-angles to a brick wall. The plane of focus should be flat - in other words, if the wall is straight and you focus on the centre of it, the extremities should also be in focus.

Now, let's say you want to be sure that the left hand end of the wall is actually in focus, so you rotate the camera, lock focus on the left hand end of the wall with the centre focus point, and then rotate back to the original position.

None of the wall will now be in focus! The focus point will actually be behind the wall. The hypotenuse of the triangle from the camera to the left hand end of the wall is longer than the distance from the camera to the centre of the wall at right-angles. So by using the centre AF point and recomposing, you have actually focused incorrectly.

That's an extreme example but the logic applies to all shots, especially when the depth of field is small. For this reason it is better to choose the AF point that is closest to the subject that you actually want to be in focus, rather than using the centre point all the time.

Hope that makes sense!
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Old 29-03-2009, 21:35   #5 (permalink)
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Re: Things you never knew your camera could do...

Quote:
Originally Posted by silkstone View Post
I prefer single-point focusing and my 40D doesn't have face detection (which I don't miss!).

There is, however, a potential problem with using the centre focus point and recomposing. It's easier to explain with a diagram, but I'll try anyway...

Imagine you are using a wide-angle lens and are at right-angles to a brick wall. The plane of focus should be flat - in other words, if the wall is straight and you focus on the centre of it, the extremities should also be in focus.

Now, let's say you want to be sure that the left hand end of the wall is actually in focus, so you rotate the camera, lock focus on the left hand end of the wall with the centre focus point, and then rotate back to the original position.

None of the wall will now be in focus! The focus point will actually be behind the wall. The hypotenuse of the triangle from the camera to the left hand end of the wall is longer than the distance from the camera to the centre of the wall at right-angles. So by using the centre AF point and recomposing, you have actually focused incorrectly.

That's an extreme example but the logic applies to all shots, especially when the depth of field is small. For this reason it is better to choose the AF point that is closest to the subject that you actually want to be in focus, rather than using the centre point all the time.

Hope that makes sense!

I have considered carefully what you said but I am not sure that this is entirely true. From your lens as you rotate for a fixed setting, the focus distance will be fixed and would there describe a circle around you. In the case of a striaght brick wall in front of you, if you focused directly ahead perpendicular to the wall, then the ends of the wall would NOT be correcty focussed. Conversely, if you focussed on the ends of the wall then the centre would be out of focus but the ends would still be in focus.

However, I can see that there is a difference in that the light is coming in at an angle but in practice I do not think that any effect is significant. I agree that it may be better to rotate the dial and choose the spot which may be on the subject but this is tricky in a group studio situation. Certainly from practical experience, using the centre spot and recomposing produces excellent results but using multi focus points will result in focus on the models shoulder, hands etc in many cases rather than the eyes. I am finding success rate to be 95% + for centre spot and recomposing and 60% for multi point. I have used manual focussing for studio work but working at speed it is easy for the model of photographer to change distance slightly without noticing and focusing using modelling lights is not always that easy.

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Old 29-03-2009, 23:04   #6 (permalink)
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Re: Things you never knew your camera could do...

Find AF to be OK in well lit subjects but now only use centre focus point (or manual) as it's slightly more reliable (but I guess I'm shooting fairly low contrast subjects - this is 20/30/40D)
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