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Problem with AF lenses on manual SLR
Old 03-31-2005, 01:06 AM   #1 (permalink)
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I was trying to use a 70-300mm AF-G Nikkor on a manual film Nikon SLR (FM-2) and all the pictures became underexposed. However, the camera indicated sufficient light at the time of taking pictures. This is the first time I was trying to use an AF lens on a manual camera. Camera works fine with manual Nikkors. Anybody knows what went wrong?

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Re: Problem with AF lenses on manual SLR
Old 03-31-2005, 01:55 AM   #2 (permalink)
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I don't believe the problem is that the lens is AF.. I believe the problem is that the lens is a G type.. It has no aperture ring and relies on the camera to set the aperture.. The FM-2 does not control the aperture, only the shutter speed.


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Aperture problem
Old 03-31-2005, 02:18 AM   #3 (permalink)
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Yes, I noticed that and adjusted shutter speed accordingly to get the 'optimum exposure' as indicated by the camera.

Theoretically, this lens doesn't have an aperture, but I noticed one exsiting. See the small lever right next to the inner edge of the lens (in the middle of the picture). That thing moves and when you look at the inside, you can see an aperture opening and closing when you move the lever. I also noticed that the normal setting for this lever is for aperture to be at 'closed' (means very slightly open) position. I don't know if this is something important. As I see, there is an aperture in this lens (I am sure this is a 70-300mm AF-G).



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Re: Problem with AF lenses on manual SLR
Old 03-31-2005, 08:45 AM   #4 (permalink)
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I'm not current on all Nikon's lenses but if your's is a DX type lens, it's not designed to cover a 35mm film format. The result would be a vignette but that could also appear to be just really dark.

Just thought I'd mention it.
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Re: Aperture problem
Old 03-31-2005, 09:03 AM   #5 (permalink)
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The lens does have an aperture.. they all do.. The G series lenses do not have an aperture ring, meaning that you have to adjust the aperture on the camera, which the FM-2 cannot do.

The lens is permanently set to the minimum aperture on that camera.. Also, according to Ken Rockwell's website, if you try to use it your photos will be about 6 stops underexposed.

Ken Rockwell - Nikkor Lens Technology


Thanks,
Israel
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Re: Aperture problem
Old 03-31-2005, 10:48 AM   #6 (permalink)
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Thanks for the tip Israel. Will read more at Ken's web site.
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Re: Aperture problem
Old 03-31-2005, 11:36 AM   #7 (permalink)
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The manual cameras require a apeture ring on the base of the lens to adjust the apeture inside the lens. You twist the ring to the desired f/stop or apeture.

The G-type lenses have an iris inside that controls the apeture, but with a manual camera you have no way to control it. It will always be set to the smallest apeture.

The lens works fine on newer but not necissarily better cameras that set the f/stop from the camera body.
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Problem \"solved\"
Old 03-31-2005, 07:03 PM   #8 (permalink)
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The answer is that G lenses are not usable in Manual Focus (FM) Nikons. Thanks Israel. Ken Rockwell's web site has a detailed description:

http://www.kenrockwell.com/nikon/nikortek.htm#g

Not a big deal since I am getting a D70 soon.

Thanks everybody.
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