Alley in Pisa, Italy

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I have found that my Nikon 60mm Micro AF-D changes aperture from 2.8 to 3.2 when used with a D90. I have tried both A and M mode. Is it by design? Why?

I intend to buy Nikon 50mm 1.4 AF-D, but it also has a switch on the lens and it will lock the maximum aperture at 2.0 (my guess) instead 2.8. So should I buy it or not, or would it be better to buy the newer 50mm 1.4 AF-S version?

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I think you must have noticed something slightly different. The max aperture is a function of the lens and should be unaffected by camera.

The Nikon 60mm Micro AF-D will change its maximum aperture as a function of the focus distance. As it focuses closer, the reported max aperture drops. By life size 1:1, its down to f/5.

There is apparently a button on the 50mm AF-D that will lock it to its minimum aperture. This is a property of manual aperture lenses. Modern cameras control the aperture automatically from the camera body. Setting this switch locks it at the minimum aperture so that the camera can automatically control it. Since your camera has an in-body focus motor, you're able to use the AF-D or AF-S, you just need to decide if there's a difference for the price that you care about. They'll both take great pictures, the AF-S will just focus faster and quieter mainly.

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Nikon 50mm AF-D also have a switch button on its body (nearby 1.4 mark) what is will used for?. –  Joan Pham Feb 17 '12 at 4:33
    
You may be refering to a autofocus vs manual focus switch. –  rfusca Feb 17 '12 at 4:42
    
No, have a look at: jbngan.com/temp/switch-on-50mm.jpg –  Joan Pham Feb 17 '12 at 6:25
    
@Ngan - I stand corrected, see the updated answer. –  rfusca Feb 17 '12 at 6:41
    
For further explanation why the aperture drops from f/2.8 to f/3.2, see this question and related answers/links - photo.stackexchange.com/questions/20300/… –  MikeW Feb 17 '12 at 6:57
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