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I was going through my parents loft (attic) and came across an old camera bag of my father's filled with bits of old junk and filters.

I came across this weird shaped filter which sadly was not boxed like the others. The others were all Cokin and this fitted in the adapter so this leads me to believe it's also a Cokin filter. The others were all self explanatory, graduated/ND/polarizer/etc, but this one caught my eye.

Annoyingly I don't have any cameras here so I can't attach the filter to a lens for a sample image.

If the images aren't clear, it's shaped like a shallow pyramid with a circular hole through it.

filter front view filter side view

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It looks like a multi-image, aka kaleidoscope filter - specifically a Cokin #201 - I can't tell whether it's an A or a P; they're the same but different sizes.

I can't find any reference to it any more on Cokin, apparently it's long out of production, but I can find many on eBay searching just 'cokin 201' - examples

This is the box artwork, as an example of the image it produces

enter image description here

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    \$\begingroup\$ So that's how they did those cliche photograph and video effects back in the day! I know we had very basic framebuffer systems in the 70s and 80s but they weren't yet capable of transparency effects like that... interesting. \$\endgroup\$
    – Dai
    Mar 27, 2017 at 8:33
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    \$\begingroup\$ Exactly right. I fixed the filter to the lens and this is what happened! (Also, although it doesn't matter, it's an A) \$\endgroup\$
    – Crazy Dino
    Mar 27, 2017 at 10:43
  • \$\begingroup\$ Glad to see my immediate impression (based on insane adaptive optics elements I used to design :-) ) was correct. \$\endgroup\$
    – Carl Witthoft
    Mar 27, 2017 at 11:44

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