4BIKER2
enthusiast
Reged: 01/02/2008
Posts: 258
Loc: West Midlands
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I've just been having a go at the grey card part of module 2, I set my D80 to manual, chose a mid aperture and 1/60th of a second and corrected the exposure with ISO, When I zoomed my 18 -135 kit lens in to the grey card to fill the frame I noticed quite a strong vignette appear. In PS I get a unit value of between 103 - 125 for a mid grey when measuring from corner to center. Is this normal for a kit lens or is there a problem with ether lens or camera. 
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Nigel 
http://www.flickr.com/photos/24057726@N02/
The learning curve is so steep I keep falling off.
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Gordon_McGeachie
Joke Historian
Reged: 19/01/2007
Posts: 3958
Loc: East Yorkshire,
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Quote:
I've just been having a go at the grey card part of module 2, I set my D80 to manual, chose a mid aperture and 1/60th of a second and corrected the exposure with ISO, When I zoomed my 18 -135 kit lens in to the grey card to fill the frame I noticed quite a strong vignette appear. In PS I get a unit value of between 103 - 125 for a mid grey when measuring from corner to center. Is this normal for a kit lens or is there a problem with ether lens or camera.
I would have thought that Vignetting would only occur when you zoom to a wider focal length.
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She (Avro Vulcan XH558)Took To The Sky Like A Lovesick Angel.
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4BIKER2
enthusiast
Reged: 01/02/2008
Posts: 258
Loc: West Midlands
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The vignette definitely gets worse at the telephoto end.
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Nigel
http://www.flickr.com/photos/24057726@N02/
The learning curve is so steep I keep falling off.
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ColinL
newbie
Reged: 10/01/2008
Posts: 5
Loc: UK
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I had a similar problem with my 18-200mm. Try stopping down to F11(ish) I eventually carried out the module using a 50mm F1.8 prime lens which is of a much higher quality than either of our zooms.
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hil26
journeyman
Reged: 07/11/2007
Posts: 79
Loc: North Wales
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Quote:
I had a similar problem with my 18-200mm. Try stopping down to F11(ish) I eventually carried out the module using a 50mm F1.8 prime lens which is of a much higher quality than either of our zooms.
am just about to start this module and the 50mm 1.8 lens was the one I had in mind to use - cheers
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4BIKER2
enthusiast
Reged: 01/02/2008
Posts: 258
Loc: West Midlands
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Well I suppose this test shows a low quality lens for what it is, unfortunately I only have a Nikon 18 - 135 and a sigma 10 - 20. I will press on regardless. 
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Nigel
http://www.flickr.com/photos/24057726@N02/
The learning curve is so steep I keep falling off.
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saffron
newbie
Reged: 30/11/2007
Posts: 29
Loc: Saffron Walden
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Quote:
Well I suppose this test shows a low quality lens for what it is, unfortunately I only have a Nikon 18 - 135 and a sigma 10 - 20. I will press on regardless.
I used a Nikon 105mm VR micro for this test. Think you will find it easier to fill the card with a longer lens rather than wide angle and 18-135 should be fine at longer end. I have a Sigma 10- 20 and reckon it is a great wide angle lens.
Peter
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saffron
newbie
Reged: 30/11/2007
Posts: 29
Loc: Saffron Walden
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Quote:
Quote:
Well I suppose this test shows a low quality lens for what it is, unfortunately I only have a Nikon 18 - 135 and a sigma 10 - 20. I will press on regardless.
I used a Nikon 105mm VR micro for this test. Think you will find it easier to fill the frame with a longer lens rather than wide angle and 18-135 should be fine at longer end. I have a Sigma 10- 20 and reckon it is a great wide angle lens.
Peter
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