meter setting for canon XL1
Posted 22 May 2005 - 06:24 AM
Posted 22 May 2005 - 09:56 PM
Posted 22 May 2005 - 10:11 PM
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.
Posted 23 May 2005 - 03:05 AM
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).)
Posted 23 May 2005 - 10:50 AM
Posted 08 November 2005 - 06:39 AM