ken

If not push/pull way, looks there is two rings, front one rotating to lock/unlock.

It's among the best animorphics. Only the Ultrastar-type lenses are sharper, and they can't go as wide FOV-wise.

The good is its HD resolution.  Weight is 1.2kg.   
Closest focus marks as 17ft/5m.  
I think this lens might be used for 70mm film projector, it  could be used up to medium format cameras, too big for M43.  For FF uses, it needs 100mm or above taking lens.   IMO, in 90% case use, ISCO integrated lens is better than it, wider, lighter, the resolution also matches taking lens. 
BTW, this is my first anamorphic lens, got it @ $120, local pickup.  I will still keep it forever. 

You did not get back part of the lens. Here is
http://www.ebay.com/itm/Isco-Optic-Blue-Star-Ultra-HD-70mm-Projector-Lens-for-Anamorphic-DSLR-Macro-/171495452280
 
this is original whole lens with back part
http://www.ebay.com/itm/321543867890

Apart from Kodak telek and Zeiss distar etc there is no a negative version of a close-up filter  :( 
 
You can find some negative lenses here: http://www.ebay.de/usr/logoxxl-gmbh
 
Achromat 75mm -3.5 Diopter
http://www.ebay.de/itm/Grose-HQ-spezial-Linse-Achromat-konvex-konkav-75mm-3-5-Dioptrien-f-286mm-/181269965491
 
 
Or
 
 
Why not start with this kit for experimenting?
 
Six 75mm lenses: 3 positive (+2, +3, +5) and 3 negative (-2, -3, -5) for us $16.00 !!!
 
http://www.ebay.com/itm/Optical-Glass-Lens-Set-3-Dbl-Convex-3-Dbl-Concave-75mm-Dia-20-30-50cm-FL-/281366510539
 
 
;) 

For using with 85mm, Kowa 16h is perfect, but ISCO integrated lens merely works.

Looks like similar to 16D, not wide for sure. I have ELMO 20mm F1.4, which came with Elmoscop-II that equals to 16H.

http://www.ebay.com/itm/Kodak-Telek-Lens-Series-6-VI-2-/121433118812?pt=Camera_Filters&hash=item1c45fa585c

Give that a go. Teleks are no longer made but have varying negative powers.

Based on my test, blue star and blank star lens have different flare performance due to coating difference, see pictures.  The blue star lens has none, but blue star lens has a little bit, at least I can use it to do alignment adjustment.   From serial number to tell, blue star lens is older. 
#5 tested picture was from blank star lens. 
If not care flaring, both lenses' sharpness and view angle have no difference at all.
 

IMO, ISCO integrated lens, around $100.  Better optics and wider then other 16x lens, except 16H.  I have posted the test result before.

I would recommend the Kowa Prominar 16h. It is small, can handle wider taking lenses and is one of the best optical performers out there. Price ranges can vary but you can get a good deal if you keep an eye on ebay. It is dual focus but that will be the case with any lens unless you go high end. The SLR Magic is also an option that is not dual focus but it is on the expensive side and the 1.33x eliminates it for me.

The stretch factor changes with your focus. If I remember it right, the stretch factor they put on the lens is for infinity focus.

If you have it just test it, shoot a round object and see how much you have to stretch it to make it round again. These lenses are almost never what they say the are, usually a little less. The Isco's say they are 1.5 but are actually ~1.41.