What's up with the Nikon 60mm Macro?

Discussion in 'Nikon Lenses' started by Dubious Drewski, Dec 26, 2008.

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  1. Dubious Drewski

    Dubious Drewski TPF Noob!

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    I was playing with the Nikkor f2.8 60mm Macro on the D700 body today and I noticed something strange. I'm sure some of you vets will know what's happening here. I was trying to set the lens to f2.8 when I noticed that it would stop me at f4.8 and not let me go larger. This confused me until I realized that if I turned the focus ring from where it was(closest focus) to infinity, the aperture then moved to f2.8.

    I rotated the focus ring completely both ways and realized that the camera was stopping down and up, based on the focal distance. Since when did primes do this??

    I've used plenty of primes from all brands, a few of those were dedicated macros like this one, and I've never seen the aperture vary with the focal distance. Is this just a quirk of this particular lens or are there others I've net yet encountered?
     
  2. Jeff Canes

    Jeff Canes No longer a newbie, moving up!

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    well you need to look at more lenses;), the aperture size is base on a formula that includes the lens length, so a 2.8 is not a fix size on all lenses


    If you have a 2X extender, look what happen to the aperture range when you use it, it should double

    Someone please post the formula
     
    Last edited: Dec 27, 2008
  3. Tolyk

    Tolyk TPF Noob!

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    I've noticed this on both the 60mm and 105mm Nikkor lenses, while playing with them at work.
     
  4. Dubious Drewski

    Dubious Drewski TPF Noob!

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    Jeff, you might have missed that this was a prime lens. It stays at 60mm. The Fstops are changing when the focus ring is turned. That is unusual for any lens.

    This doesn't happen on any of the Pentax Macros or the couple Canon ones I tried.
     
  5. Battou

    Battou No longer a newbie, moving up!

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    Nore mine, My Pentax, Canon and a third party (Minolta mount) prime decicated macros do not do that.
     
  6. Parkerman

    Parkerman TPF Noob!

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    I have the 60mm. I know that this occurs but doesn't bother me because with the focus as close as it can go... can you imagine what the Depth of Field would be if you took a picture...It would be a small little sliver.
     
  7. Battou

    Battou No longer a newbie, moving up!

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    Yes, but some times that sliver is all one wants, It seems illogical for a manufacturer to negate that possibility to me.
     
  8. Dubious Drewski

    Dubious Drewski TPF Noob!

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    Sure. I'm not saying it would be universally useful to have f2.8 through the whole focus range, that's not my point. I'm just wondering why this lens is the only one I've ever seen that does this. (And apparently the Nikon 105mm does it too)

    It's just odd.
     
  9. Jeff Canes

    Jeff Canes No longer a newbie, moving up!

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    If the prism in the lens is moving forward away from film/sensor plan in macro mode then it could/should change the aperture value. All depends on the design of the lens. The location of the prism in the lens has an effect on magnification. So move the prism location in the lens would change the magnification and aperture, plus it is cheaper to design and built that way, this is a comment design trick used on cheap zoom lens, but it should have the same affect with any lens

    It’s been 20 plus years since photography class and it late, so I maybe all wrong, but I still think this has some thing to do with what is happening
     
  10. Parkerman

    Parkerman TPF Noob!

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    Yea, I am sure there is probably more do it than that..


    But here is a picture of a business card shot with the 60mm at f4.8

    [​IMG]
     
  11. Dubious Drewski

    Dubious Drewski TPF Noob!

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    Yes, that example shows how f4.8 or wider would be undesirable for this shot, but if your subject was more flatly facing the camera, then even f2.8 could be useful.

    Exactly. This lens isn't some cheap lens. It's relatively solid and it takes great pictures, so this is all a bit strange. But if it means it might have shaved a bunch off of the purchase price if the lens, then I guess there's nothing much to complain about.
     
  12. joel28

    joel28 TPF Noob!

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    *
     
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