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Canon XL and GL Series DV Camcorders
Canon XL2 / XL1S / XL1 and GL2 / XM2 / GL1 / XM1.


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Old January 26th, 2006, 05:57 PM   #1
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F Stops & mm's

Please tell me (a)how the final set of pictures on your FOV Comparison might have been different if you had chosen different f/stops to those you chose and (b)what is meant by f/4 full wide and f/5.6 medium and (c) what the mm measurements for 16:9 & 4:3 refer to?


Sigma EF 70mm - 300mm with Canon EF Adapter and 1.6x Extender
320mm f/4 full wide
16:9 = 2,496mm / 4:3 = 3,072mm

480mm f/5.6 medium
16:9 = 3,744mm / 4:3 = 4,608mm



Top row: Sigma 70mm-300mm at 200mm w/ 1.6x Extender in 16:9 and 4:3
Bottom: Sigma 70mm-300mm at full tele w/ 1.6x Extender in 16:9 and 4:3
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Old January 27th, 2006, 08:03 AM   #2
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I'm not sure what FOV Comparison you are referring to, but I believe to answer b):

f/4 is your f stop when the zoom is all of the way wide and f/5.6 is the f stop at halfway zoomed.

That would be my guess, anyway, but I've been wrong before.
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Old January 27th, 2006, 08:07 AM   #3
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The reference is to my XL2 FOV page at http://www.dvinfo.net/canonxl2/articles/article10.php

I simply used the maximum aperture available at each f/stop (that is, each end of the zoom range at full wide or full tele). That was the method. The mm measurements for 16:9 & 4:3 refer to their 35mm still photo lens equivalents for those particular fields of view.
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Old January 27th, 2006, 01:51 PM   #4
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Thank you for the info which I'll be absorbing slowly as usual.

I'm sitting in front of my Sigma DL Zoom 75-300mm 1:4-5.6, made in Japan bought 10 years ago which I've only used for long-shot stills (on Digital Rebel now). Is this a similar lens to what you were able to use on your XL2 (simply because XL2 accommodates interchangeable lens)? Or does the XL2, being a camcorder, require a different sort of lens? Could the XL-H1 use my Sigma 75-300?

I'm beginning to think that there should be a separate thread entitled: Implications of XL2 FOV Comparison. It would have deep significance for me at any rate if (a) the comparative detail revealed would also apply if, say, the tractor was a moving object, and (b) the results obtained with your XL2 could be equalled by the XL-H1.

Last edited by Brendan Marnell; January 27th, 2006 at 05:28 PM.
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Old January 27th, 2006, 05:43 PM   #5
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Could the XL H1 use your Sigma 75-300? If that lens has an EOS mount, then yes you can, providing you also obtain the Canon XL to EF adapter (about $450). The lens may provide a suitable image for SD but I don't think it's up to scratch for HD. Also I noticed a significant amount of chromatic abberation with that Sigma lens at the long end.
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Old January 27th, 2006, 06:30 PM   #6
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Thank you kindly, Chris
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