Arri standard mount. Front and rear element caps. $650 fast f/2.2 constant aperature. This is a very famous classic lens that shot tons of films and news the world over. (Du All New Jersey pricing $1000 - $1350 check it out) Legendary lens designed and built in France. Fast lens, adaptable to modern micro 4/3 cameras like Black Magic and other mounts likely possible. I read it can adapt to Super35mm / S35 sensor size and work but I am not sure about that and haven't tried something like that. I shot an entire feature film with this and then it's been in climate controlled storage for 20 years. Great optics. Front 75mm push and rear element caps included. Since it was a push cap, I always used a little gaff tape to make sure it stayed put for travel. So you can see a little gaff tape adhesive residue on the lens barrel outsides - I just haven't bothered to clean it off but would be very simple to remove. Some dust in pics which is all on the outside of the lens, I should probably clean it and then re-take pics. The Arri Standard mount work with Arri bayonet mounts which are more common, this lens doesn't have the additional locking tab the Bayonet mount has. But it works with both mounts, and I never had a problem with it moving in my Arri Bayonet mount. Very snug fit. If interested I also have a gold / brass Arri Bayonet to Eclair CA mount adaptor - very very rare! That's what I jumped this lens to, a legendary classic the Eclair NPR 16mm film camera. I travel to Boston frequently and southern NH and sometimes Vermont so I could deliver to serious buyer.