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May 21st, 2004, 03:41 AM
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#1 |
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Major Player
Join Date: May 2004
Location: hungary
Posts: 462
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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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May 21st, 2004, 04:03 AM
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#2 |
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Outer Circle
Join Date: May 2002
Location: Hope, BC
Posts: 7,524
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Perhaps the hood (or filter) gets in the way?
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May 21st, 2004, 04:21 AM
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#3 |
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Old Boot
Join Date: Aug 2002
Location: London UK
Posts: 3,633
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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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May 21st, 2004, 04:26 AM
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#4 |
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Outer Circle
Join Date: May 2002
Location: Hope, BC
Posts: 7,524
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The last one sounds good.
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May 21st, 2004, 04:36 AM
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#5 |
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Major Player
Join Date: May 2004
Location: hungary
Posts: 462
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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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May 21st, 2004, 04:44 AM
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#6 |
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Old Boot
Join Date: Aug 2002
Location: London UK
Posts: 3,633
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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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May 21st, 2004, 05:24 AM
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#7 |
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Capt. Quirk
Join Date: Apr 2002
Location: Middle of the woods in Georgia
Posts: 3,596
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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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www.SmokeWagonLeather.us |
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May 21st, 2004, 06:03 AM
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#8 | |
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Outer Circle
Join Date: May 2002
Location: Hope, BC
Posts: 7,524
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Quote:
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May 21st, 2004, 10:46 AM
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#9 |
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Retired DV Info Net Almunus
Join Date: Dec 2001
Location: Chicago, IL
Posts: 6,943
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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.
__________________
Lady X Films: A lady with a boring wardrobe...and a global mission. Hey, you don't have enough stuff! Buy with confidence from our sponsors. Hand-picked as the best in the business...Really! See some of my work one frame at a time: www.KenTanaka.com |
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May 23rd, 2004, 03:05 AM
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#10 |
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Major Player
Join Date: May 2004
Location: hungary
Posts: 462
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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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May 23rd, 2004, 11:21 AM
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#11 |
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Trustee
Join Date: Oct 2001
Location: San Luis Obispo CA
Posts: 1,195
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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. Barry |
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