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Canon XH Series HDV Camcorders
Canon XH G1S / G1 (with SDI), Canon XH A1S / A1 (without SDI).


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Old June 29th, 2007, 11:03 PM   #1
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more depth of field?

A1 doesnt seem to give much shallow depth of field. Is there any trick to make the background more blurry?
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Old June 29th, 2007, 11:05 PM   #2
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well, I really meant shallower depth of field, more blurry back ground..
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Old June 29th, 2007, 11:22 PM   #3
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Hmm

Lots of other threads about this just search for DOF or Depth of field... but a good way to get good DOF is to go further away and zoom in all the way or as much as you can and leave room between what your shooting and the background.. also open up the iris as much as you can.. use the nd filters on the cam and you can even add another one on top of that to be able to keep iris all the way open..

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Old June 30th, 2007, 08:16 AM   #4
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IMHO coming from the AG-DVC30 which was a three CCD 1/4" camcorder the DOF on the A1 is superb improvement due to the larger sensors. I've had really great results thus far but the DOF is most obviously more noticeable at longer telephoto shots.
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Old June 30th, 2007, 09:39 PM   #5
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The trick to get the most the camera can get is:

Zoom in as far as you can
Keep the Iris open as much as possible

This means you'll probably have to move very very far back from your subject.

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Old June 30th, 2007, 11:32 PM   #6
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yeah, I knew about the zoom and large aperture. But i was hoping to find some miracle like an add-on lens or firmware upgrade kinda trick to enhance DOF....
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Old June 30th, 2007, 11:58 PM   #7
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35mm adapters

theres the brevis35, letus35, redrockmicro m2.. tons more just do some searches for 35mm adapters...
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Old July 1st, 2007, 12:01 PM   #8
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approximate film equivs for DoF rendering:

1/3" chip ~ 8mm
2/3" chip ~ 16mm
1.3" chip ~ 35mm

No magic, physics. Iris and capture plane size.
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Old July 2nd, 2007, 03:52 AM   #9
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If you look at the equations governing DOF you'll notice that focal length plays the biggest role (it is squared in the equation). Bigger sensor/film counterplays this a bit as the enlargement is less with bigger picture and you can have larger circle of confusion. Example from film world: 50mm lens with 35mm film has less DOF than 50mm with 6x7 (would be a wide-angle with 6x7) because with 35mm film CofC must be smaller. 50mm with 35mm has more DOF than 105mm lens with 6x7 (same angle of view) because doubling the focal length quadruples the FL part of the equation and doubling the CofC can not compensate.

Safe to say that bigger sensor sizes have less DOF because longer lenses are used with those, larger sensor size in itself makes DOF less...

This is purely an optical thing, basically nothing can be done to it. Exept an optical trick of using a rotating tilt lens...

With steady subjects selective softening can be done in post.
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