Nikkor APO 480mm f9, quick question

Eric Rose

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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
 

tkamiya

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

Shawn Dougherty

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shutterfinger said:
Barrel lens with a slot with sliding cover- used for waterhouse stops or drop in filters, your choice.
Click to expand...

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. =)
 

E. von Hoegh

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tkamiya said:
It's probably a flat field correction. I see the lens listed as a copy lens.
Click to expand...

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.
 
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