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John_K
addict


Reged: 03/09/2006
Posts: 584
Loc: North Yorks
Under exposure with AIS lenses
      #707093 - 16/09/2008 09:23

When I want to travel light when walking I take my D200 and 3 prime lenses, all AIS Nikkors a 24/2.8 50/1.8'e' series and a 135/2.8. I have to set the exposure compensation to give me one extra stop of light with these lenses or they all under-expose. The camera meter is set on Centre weighted.

I have tried using a meter separately and the same result occurs. There is never any problem (well very rarely) with AFD Lenses.

There is no problem with the sharpness of the lenses, but I have to be aware of the loss of light.

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El Sid
Going potty


Reged: 14/04/2003
Posts: 9546
Loc: Sussex-by-the-Sea
Re: Under exposure with AIS lenses [Re: John_K]
      #707099 - 16/09/2008 09:30

Isn't there a menu item or something that allows you to set certain parameters when using non-CPU lenses? I think you have to tell the camera what the focal length is along with maximum (and possibly minimum) aperture so that the metering system can correctly interpret the light falling on it's sensor.

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Nigel

Completely BSRIPN

ElSid Gallery

A camera in the hand is more fun than one in the cupboard........

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Garfield
Fanboy


Reged: 19/12/2007
Posts: 123
Loc: London
Re: Under exposure with AIS lenses [Re: John_K]
      #707406 - 16/09/2008 19:43

Quote:

When I want to travel light when walking I take my D200 and 3 prime lenses, all AIS Nikkors a 24/2.8 50/1.8'e' series and a 135/2.8. I have to set the exposure compensation to give me one extra stop of light with these lenses or they all under-expose. The camera meter is set on Centre weighted.

I have tried using a meter separately and the same result occurs. There is never any problem (well very rarely) with AFD Lenses.

There is no problem with the sharpness of the lenses, but I have to be aware of the loss of light.



I've had a similar problem with AI(-S) lenses on a D300. Haven't yet noticed it on my D700.

I have a 28mm f/3.5, a 55mm f/2.8 Micro and a 135mm f/3.5 - all Nikkors and all AI or AI-S and only the 55mm caused any noticable problems.

In the end I settled on using +0.5 or +1.0 EV compensation to correctly expose.

Is it possible that modern DSLRs are 'calibrated' to AF lenses? Assuming they are built differently?

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