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Canon GL Series DV Camcorders
Canon GL2, GL1 and PAL versions XM2, XM1.


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Old May 21st, 2004, 04:41 AM   #1
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Vignetting with 20x zoom

I just wondering why does the picture vignetting if i zoom fully in.
Lens hood is on the cam.
The effect is very visible on pc/projector (outside the safe area), but it can be seen also on the TV (in the safe area).

Is this normal?
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Old May 21st, 2004, 05:03 AM   #2
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Perhaps the hood (or filter) gets in the way?
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Old May 21st, 2004, 05:21 AM   #3
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Ghosts of Hungary - -OOOooooo .. . . scary ! ! !

Nope . .not here, Standard and WD58H hoods on. You got any other stuff bolted on? Mics or floppy furries . . or loose women!!
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Old May 21st, 2004, 05:26 AM   #4
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The last one sounds good.
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Old May 21st, 2004, 05:36 AM   #5
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Yes, it is the hood, because i don't have any filter, mic, etc.
just pure xm2.

i just wondering
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Old May 21st, 2004, 05:44 AM   #6
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Prech, you sure it was the "standard" Canon hood that came with it .. ? We've been here before with "standard" - yeah? Can you share a picture of the hood you're having problems with?

No vinigretteables here . .

G
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Old May 21st, 2004, 06:24 AM   #7
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I have the GL1, and have never noticed anything similar. In fact, the only problem I have had with the zoom, is the digital end seems to degrade the picture quality. I am looking to get a telephoto lens to extend it's range without using the digital zoom.

Is there such a thing as a wide angle telephoto lens adapter? For the GL1?
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Old May 21st, 2004, 07:03 AM   #8
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Quote:
Is there such a thing as a wide angle telephoto lens adapter? For the GL1?
Nope. It's either a tele or a wide.
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Old May 21st, 2004, 11:46 AM   #9
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This is normal for certain iris settings. It's known as edge fall-off and it's a common characteristic for all lenses. I, too, was alarmed when I discovered this when the GL2 was first introduced.
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Old May 23rd, 2004, 04:05 AM   #10
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Here is a dv avi file, that show vignetting with original canon lens hood:

http://web.axelero.hu/prechj/pics/vignetting.avi

(6mb)

you can see, the effect is harder as i zoom in.
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Old May 23rd, 2004, 12:21 PM   #11
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Prech

Ken is correct. This is one of the effects of putting a 20x zoom lens into a very small package. The effect shown in your clip is exactly that detailed in a very active discussion here from last year. (even the off-centered quality of the vignetting is pretty well documented). So there is nothing specifically wrong with YOUR camera, its just a limitation of the lens design that canon is using....oh, to have a $10,000 zoom on our $2000 cameras, that'd be nice huh?---You've exacerbated the issue by including a low detail, neutral sky in your frame...this will show inconsistencies like this more than a detailed, higher contrast shot.

You can minimize this effect by shooting with an aperture of f5.6 - f8, and by eliminating any gain (manual, or automatic) being applied to the image. Also shooting close-ups of zebras wouldn't hurt.


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