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Thread: Nikon 105mm VR macro issue

  1. #21
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    Default Re: Nikon 105mm VR macro issue

    i know the nikkor 60/2.8 AF-S macro has a maximum aperture of 3.5 when the focus range is between the MFD and a certain distance. otherwise, it will have a max aperture of 2.8 at other focus distances. this shows up in the exif, and camera display as you focus in and out.
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  2. #22
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    Default Re: Nikon 105mm VR macro issue

    Quote Originally Posted by antacid View Post
    i know the nikkor 60/2.8 AF-S macro has a maximum aperture of 3.5 when the focus range is between the MFD and a certain distance. otherwise, it will have a max aperture of 2.8 at other focus distances. this shows up in the exif, and camera display as you focus in and out.
    amazing! does the 105/2.8 micros have a similar behaviour?

  3. #23

    Default Re: Nikon 105mm VR macro issue

    Quote Originally Posted by hwchoy View Post
    I looked at my EF 100/2.8 macro, there is some "wavering" of the blades as I focus but no where near the scale that can be regarded as "smaller aperture".


    i think its just a misconception that the aperture value has to represent the diameter of the aperture to which light passes through

    its like sticking a telephoto lens, i.e. 200mm f2.8 on a 25mm extension tube that has electronic contacts, i.e. kenko which i have one of, the camera reads the whole setup as f2.8, but essentially with the extension tube on, you have lost light of a stop plus already

    the newer nikkor lenses have electronics that reflect this light loss, so that the camera can compensate for the exposure changes. the older nikkors dont reflect this, neither does the AIS lenses.

    for both macro lenses 105mm VR, and 60mm afs, f2.8 is only achieved close to and at infinity focus

    else as you focus nearer, the rear lens group extends its distance away from the sensor, and you have light loss due to the micro/macro design giving magnification
    pedantic.

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