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Aperture problem in Nikkor 55-200 f/4-5.6 VR?
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<blockquote data-quote="Felisek" data-source="post: 291352" data-attributes="member: 23887"><p>I have just bought a Nikkor 55-200 f4-5.6 VR lens for my D7100 camera. I noticed that pictures taken with aperture fully open look quite underexposed. In a series of photos taken outdoors with the same exposure level but aperture varying from f4 to f11, those with f4, 4.5 and 5 were underexposed. The effect is most pronounced at f4.</p><p></p><p>Then I took a series of pictures indoors with constant artificial light and looked at them in ViewNX2. The histograms for f greater than f5 are very similar, but f4 was underexposed again. just to make sure that this wasn't a problem with camera metering I took another series in manual mode with full-stop increments: f4, 5.6, 8, 11 and 16, doubling the shutter speed every time. Again, the f4 was underexposed, while f5.6, 8 11 and 16 were quite similar. In order to correct the f4 histograms to those from f5 and higher, I had to apply exposure compensation of about 0.8-0.9.</p><p></p><p>This means than my lens is underexposing at f4 by almost a full stop. According to DXOmark test, the lens is behind the manufacturer's f by only about 0.3-0.4 stop and this doesn't change much with the aperture.</p><p></p><p>It seems to me that the aperture in the lens doesn't fully open below f5. I'm about to send it back for a replacement, but wanted to ask here if anyone else experienced a similar problem. I hope this is a not a "feature" of this cheap lens.</p><p></p><p>My other lens is Sigma 17-50 f2.8. It doesn't show any issues with exposure of focus, so I don't think the problem is in the camera.</p></blockquote><p></p>
[QUOTE="Felisek, post: 291352, member: 23887"] I have just bought a Nikkor 55-200 f4-5.6 VR lens for my D7100 camera. I noticed that pictures taken with aperture fully open look quite underexposed. In a series of photos taken outdoors with the same exposure level but aperture varying from f4 to f11, those with f4, 4.5 and 5 were underexposed. The effect is most pronounced at f4. Then I took a series of pictures indoors with constant artificial light and looked at them in ViewNX2. The histograms for f greater than f5 are very similar, but f4 was underexposed again. just to make sure that this wasn't a problem with camera metering I took another series in manual mode with full-stop increments: f4, 5.6, 8, 11 and 16, doubling the shutter speed every time. Again, the f4 was underexposed, while f5.6, 8 11 and 16 were quite similar. In order to correct the f4 histograms to those from f5 and higher, I had to apply exposure compensation of about 0.8-0.9. This means than my lens is underexposing at f4 by almost a full stop. According to DXOmark test, the lens is behind the manufacturer's f by only about 0.3-0.4 stop and this doesn't change much with the aperture. It seems to me that the aperture in the lens doesn't fully open below f5. I'm about to send it back for a replacement, but wanted to ask here if anyone else experienced a similar problem. I hope this is a not a "feature" of this cheap lens. My other lens is Sigma 17-50 f2.8. It doesn't show any issues with exposure of focus, so I don't think the problem is in the camera. [/QUOTE]
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Aperture problem in Nikkor 55-200 f/4-5.6 VR?
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