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Sounds like stuck aperture blades. Do they move freely as you wiggle the little metal lever on the right side of the lens mount?
Posted 34 months ago.
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I set shutter to 2 secs and check how aperture is closing during shooting. At f2 aperture remains fully open, at f2.8 it becaming a little smaller.
Blades moving OK...
Posted 34 months ago.
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Only the AI and the G lenses do expose properly. Problem with lens contacts?
Originally posted 34 months ago.
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Licht~Bild edited this topic 34 months ago.
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I am doing manual exposure, so its no matter is there auto metering or not.
Posted 34 months ago.
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Is there any ambient light in your test setup?
With such large apertures even a 60-watt bulb can influence overall exposure.
Posted 34 months ago.
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exdigecko I am doing manual exposure, so its no matter is there auto metering or not.
Still your lenses have an electronically controlled aperture.
Originally posted 34 months ago.
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Licht~Bild edited this topic 34 months ago.
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If dof-preview button works OK, does it mean electronical control works well too?
Posted 34 months ago.
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It really sounds like sticking aperture blades. When you open the lens by hand, you aren't really able to measure aperture except by eye. I'd consider taking the lens in for service or sending it back for cause.
/..
Posted 34 months ago.
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I've just checked it. Placed camera with attached lens under bright lamp during shooting. Its really visible difference in lens between f2 and f2.8. At f2.8 blades clearly visible, at f2 they are hiding inside.
Hmm maybe its just lens specific? Is anybody here can do quick test for me please?
Posted 34 months ago.
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i don't know if it's even possible, or if i'm talking rubbish, so correct me if i'm wrong. (i just got this idea while reading this tread).
is it maybe possible that the apartureblades of one lens move faster than the other, and that that causes the difference in exposures at the smaller apartures.
because at full open the exposure looks the same, but if you close down there's a difference.
Posted 34 months ago.
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so it looks like this thread is being used to illustrate the issues with camera makers lying about the real numbers underlying the fast lenses. i dont understand or care about all the nonsense but ohh well.
Posted 19 months ago.
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nikonrumors.com/2010/11/06/is-f1-4-at-iso-200-really-f1-4...
Posted 19 months ago.
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exdigecko
Do you have any photos posted with the EXIF data?
There is a possibility it's not the lens. Do you have the lens profile set up in the D700? I had similar issues a while ago and was able to make corrections.
Posted 19 months ago.
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DXO is a bad player when it comes to installing even the trial version of their editing software. I don't really trust the company, so I'm not sure of their conclusions either.
/..
Posted 19 months ago.
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Test the exposure with the Aperature in manual-mode (allredy stoped down when you fire the trigger) to se if this is du to aperature-lag.
Posted 19 months ago.
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@Irrbloss - just done it, same issue.
Posted 19 months ago.
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Just another uncontrolled experiment. You can watch the flash Guide Number (GN) change in the data by > 1.47x from 13.4 @ 35mm to > 19.8 above 105mm. . . just like the SB-800 manual says it should @ M/8. {SB-800 manual p. 42}.
Posted 19 months ago.
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Pixel peeping is a sin you know.
Posted 19 months ago.
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@starfish
My flash was off-camera. When you take flash off-camera, it wont zoom until you make it by yourself. And it power output wont change, too.
@houston
If you shooting in low light, you'd better know which lens give you more oomph. Also, when you buy 1000$ lens, you'd better know why its acting weird.
Posted 19 months ago.
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Also you can watch my photostream and see im not a cats-n-walls shooter.
Posted 19 months ago.
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Try repeating the test focused at infinity. I suspect fotosniper is sort of close - but it's more an issue at the closer focusing distances used for your test shots. I suspect at infinity, the lens will behave properly.
It's also not clear exactly how you tested the lenses.
Posted 19 months ago.
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