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Thread: Does your 90mm f:8 Nikkor have a brass shim on the rear element?

  1. #1

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    Does your 90mm f:8 Nikkor have a brass shim on the rear element?

    Only 0.002" thick? I ask because I've got a nice one (no shim) and a beater with shim. On the rear element. Thanks.

  2. #2
    Andrew's Avatar
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    Re: Does your 90mm f:8 Nikkor have a brass shim on the rear element?

    no shims on mine... front or back

  3. #3

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    Re: Does your 90mm f:8 Nikkor have a brass shim on the rear element?

    Thanks

  4. #4

    Re: Does your 90mm f:8 Nikkor have a brass shim on the rear element?

    Mine is sans shims.

  5. #5
    Andrew's Avatar
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    Re: Does your 90mm f:8 Nikkor have a brass shim on the rear element?

    Q. is the beat up one still in the original Nikon shutter or has someone swapped it into a non-Nikon branded shutter?
    if the cells have been swapped between shutters, maybe the shim is from the lens that was originally on that shutter ???

  6. #6

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    Re: Does your 90mm f:8 Nikkor have a brass shim on the rear element?

    The shim *could* be original, of course. It may have been decided during QC that this particular lens/shutter combination needed that extra 2 thou. Reading this FAQ entry from Flutot's Camera Repair, it seems they expect this to be the case from time to time: http://flutotscamerarepair.com/FAQ.htm#RemoveLens

  7. #7
    Andrew's Avatar
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    Re: Does your 90mm f:8 Nikkor have a brass shim on the rear element?

    Quote Originally Posted by tih View Post
    The shim *could* be original, of course.
    indeed, it could be.... but I'm wondering if it's not original because I have a few lenses with shims and they're all on the front

  8. #8

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    Re: Does your 90mm f:8 Nikkor have a brass shim on the rear element?

    I am a little embarrassed to fully explain why I am asking but I will. I was making a list of all my LF lenses for insurance purposes and figured I'd clean them as I went. A few required removal from the shutter to clean the inner element as there was some haze present. When I got done I see this spacer sitting on the counter. It had to be from a Copal 0 lens, it had to be one I took out of the shutter, which narrowed it down to the point where I was almost sure where it came from. It doesn't really fit the Nikkor front element but is a nice fit for the step on the back element. I have a vague recollection of this being there on this lens, which I had to fully disassemble when I bought it due to some fungus which thankfully left no permanent etching. So anyway, I thought I'd ask.

    It has been my experience that shims are more likely a creature of wide angles, and that 0.002 inches of spacing in a longer focal length would not make a difference in a photo. I've used a loop looking at the aerial image with this one with and without the shim and I honestly don't see a difference.

    Anyway, thanks to those of you who took the time to check. I'll probably run a test with the AF resolution chart and some film just to be safe.

  9. #9

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    Re: Does your 90mm f:8 Nikkor have a brass shim on the rear element?

    Quote Originally Posted by Kevin Crisp View Post
    I am a little embarrassed to fully explain why I am asking but I will. I was making a list of all my LF lenses for insurance purposes and figured I'd clean them as I went. A few required removal from the shutter to clean the inner element as there was some haze present. When I got done I see this spacer sitting on the counter. It had to be from a Copal 0 lens, it had to be one I took out of the shutter, which narrowed it down to the point where I was almost sure where it came from. It doesn't really fit the Nikkor front element but is a nice fit for the step on the back element. I have a vague recollection of this being there on this lens, which I had to fully disassemble when I bought it due to some fungus which thankfully left no permanent etching. So anyway, I thought I'd ask.

    It has been my experience that shims are more likely a creature of wide angles, and that 0.002 inches of spacing in a longer focal length would not make a difference in a photo. I've used a loop looking at the aerial image with this one with and without the shim and I honestly don't see a difference.

    Anyway, thanks to those of you who took the time to check. I'll probably run a test with the AF resolution chart and some film just to be safe.
    The AF made a nice chart but your lens was not made for copying a flat chart at near distances. Go shoot a brick wall.

  10. #10

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    Re: Does your 90mm f:8 Nikkor have a brass shim on the rear element?

    I was not going to shoot it at a near distance. I have three charts us one in the middle left and right of the frame.

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