Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Is this a Canon EF mount lens?
Document: I own one &#34;L&#34; lens and wish it were a constant f2.8 at the price Canon desires you to pay. Oh, did you want a hood, tripod mount etc. for that &#34;L&#34; lens? That'll be extra $$$.$$.Sigma offers a fine lens, hood and tripod ring included in it's lens price.
Shooting on full manual eradicates this problem...but sometimes I like to use aperture priority in certain situations. But seriously, I wonder if the Sigma is communicating differently to the camera body than the 85L. I would prefer not to have to punch up the exposure in post for every shot, or to have to use exposure compensation every time I mount this lens (because I probably won't remember to).5.) The Sigma is super contrasty...almost too contrasty.
I feel as though I would prefer to add contrast in post, rather than have the lens do it for me. But that's just me.6.) This is a pretty remarkable lens. It truly blows the EF 85 1.8 out of the water, IMHO. It handles better and feels great in the hands. Robust build, solid hood, zippy AF. The bokeh is astounding and is on par with the 85L (again, subjective).
They could mount them (in batches of ten) onto a very-simple test bench and verify focus in less-than four seconds each (or less). WHY WOULD THEY SHIP A $1,000.00 GRAB-BAG MYSTERY-OUTCOME TO THE MOST LUCRATIVE (per-capita) AND LOYAL CUSTOMER-BASE ON THE PLANET EARTH ?? (i.e.
This lasted for about 20-25 minutes. Has anyone experienced this?2.) After 20-25 minutes of AF madness, it literally seemed to "snap out of it," and the AF has been nothing short of stellar since. Simply no more hunting or convulsing. Nearly as fast as the EF 85 1.8, but tremendously faster than the 85L II. It now locks onto everything and does it quickly, even in near darkness. This is simply astounding.
(I use this lens on a full frame Canon body.)
!I recommend this lens for 1/3 the price of the Canon f/1.2
Overview:This is an awesome lens for the price. At almost half of what you pay for the Canon L, you get great quality pics!
Wonderful lens, sharp, a grand less than the Canon 85mm 1.2 II L series. Heavy and durable (try not to use with extended battery, would be too heavy).
This lens is amazing. It's super sharp wide open and i love how it renders the background. I had some initial problems with front focusing but after MA it's working great and as consistently as my canon lenses.
Answer: It's for Sony, Nikon, Canon and a few others. My mount is the Sony A mount.