Nikkor APO 480mm f9, quick question

Discussion in 'Large Format Cameras and Accessories' started by Eric Rose, Jul 29, 2013.

  1. Eric Rose

    Eric Rose Subscriber

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    I just received one of these lenses from an APUG member. There is a slider (not the f-stop ring) on the lens barrel. What the heck is it for?

    Eric
     
  2. shutterfinger

    shutterfinger Subscriber

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    Barrel lens with a slot with sliding cover- used for waterhouse stops or drop in filters, your choice.
     
  3. tkamiya

    tkamiya Member

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    It's probably a flat field correction. I see the lens listed as a copy lens.
     
  4. Shawn Dougherty

    Shawn Dougherty Member

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    Yep. I used one on 8x10 for several years, great lens. I taped the slot closed, wasn't sure if stray light getting in would cause problems but I was fairly certain it wouldn't help. =)
     
  5. E. von Hoegh

    E. von Hoegh Member

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    Most process lenses have this slot for Waterhouse stops used in making halftones.
    Flat field correction? hardly. These are already flat-field lenses, apochromatic as well.