Pentax ZOCS lens on Eos 5DSR

[JMC]

I got this lens - a Pentax ZOCS - after seeing them on ebay. They are advertised as having fluorite lens elements and I was wondering if they would be good for UV imaging. As it turns out they don't have fluorite elements, but they do have a funky coating on one of the elements. This reflects blue and red light quite effectively and lets the green pass. It has a 210mm focal length, and no iris, but is about f4. Thankfully I paid less than the price of the helicoid for this lens, and not the hundreds of dollars some vendors have them up for sale for.

I decided to try and mount it up anyway as I've not played with these type of lenses before. It had a 67mm outside diameter, so I picked up a few bits to try and mount it - adapters from Raf and a M65 helicoid. With this and a few extension tubes I got it on to my Canon EOS 5DSR;

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Given the green colour cast from reflecting red and blue light, I took a few pictures of greenery in the garden to try it out. These are my first attempts (all reduced in size from the original resolution for posting on here, and some minor processing in Photoshop for contrast and curves).

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[blotafton]

It looks interesting, do you know the intended use for this lens?

[JMC]