View Full Version : Vignetting with 20x zoom
Prech Marton May 21st, 2004, 03:41 AM 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?
Frank Granovski May 21st, 2004, 04:03 AM Perhaps the hood (or filter) gets in the way?
Graham Bernard May 21st, 2004, 04:21 AM Nope . .not here, Standard and WD58H hoods on. You got any other stuff bolted on? Mics or floppy furries . . or loose women!!
Frank Granovski May 21st, 2004, 04:26 AM The last one sounds good.
Prech Marton May 21st, 2004, 04:36 AM Yes, it is the hood, because i don't have any filter, mic, etc.
just pure xm2.
i just wondering
Graham Bernard May 21st, 2004, 04:44 AM 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
K. Forman May 21st, 2004, 05:24 AM 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?
Frank Granovski May 21st, 2004, 06:03 AM Is there such a thing as a wide angle telephoto lens adapter? For the GL1?Nope. It's either a tele or a wide.
Ken Tanaka May 21st, 2004, 10:46 AM 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.
Prech Marton May 23rd, 2004, 03:05 AM 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.
Barry Goyette May 23rd, 2004, 11:21 AM 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.
Barry
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