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meter setting for canon XL1


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#1 siddharth diwan

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Posted 22 May 2005 - 06:24 AM

I'm shooting on Canon Xl1 with frame rate 24p mode, what meter settings do i need to do for that.
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#2 Josh Hill

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Posted 22 May 2005 - 09:56 PM

You cannot be shooting 24p on an XL1. If you're shooting in frame mode you're shooting 30P, but it's really not even real 30P if I remember correctly.
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#3 Ed Moore

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Posted 22 May 2005 - 10:11 PM

Or if it's a PAL XL1, frame movie mode would generate 25p.

But Josh is right, it's not "proper" progressive scan. I defer to the rather wonderful Adam Wilt:

These cameras get their "proscan" images not by truly perfoming progressive readout on the chips, but rather by offsetting the green CCD's read timing by one scanline during readout -- vertical pixel-shift, if you will. In essence, an even field from R & B CCDs is blended with an odd field from the G CCD, giving you a frame that has the scanlines for both fields captured at the same instant in time. This gives a definite improvement over mere field-doubled "frames", but it's not as sharp vertically as true proscan. Each "scanline" is actually composed of two scanlines from each chip, so there is some softening vertically; also, the effective chroma resolution is halved vertically.


As for the meter readings it's difficult to say exactly but I have heard figures bandied around for the XL1 with 0db gain being roughly equivalent to ISO 160 to 200. That makes a sort of sense to me as I know the F900 with it's larger CCDs reads out at 320.

If you have access to a really well lined-up monitor and an 18% reflectance grey card, you can work it out for yourself. Will post how if you like.
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#4 Josh Hill

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Posted 23 May 2005 - 03:05 AM

160 to 200 is way low, I think. All of the numbers I've seen tend to say the XL1(s) is up into the 500-800 range and possibly higher (depending on each individual camera). I believe I read, once, that it was even 1600.

But of course, I could be wrong (and so could the dozen of people writing articles postulating on the ISO rating of the XL1(s).)
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#5 Mike Donis

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Posted 23 May 2005 - 10:50 AM

When shooting video, it rarely matters to have a light meter on set. Because the output is at full quality, what you see is what you get - the zebra settings are your biggest exposure determining tool.
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#6 Sampsa Huttunen

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Posted 08 November 2005 - 06:39 AM

I shot a documentary with Panasonic AG-DVX100A and Canon XL2 in 25p mode and found that XL2 needs more light than DVX100 which is around ISO 320.
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