Scroll to the bottom. Fixed aperture thought, but the 35mm 1.5 is really nice. And i dont think u can find any other lenses made for videos in the Samyang price range. Otherwise the photography lenses sure work too from Samyang and are a bit cheaper. Cinema 35mm 1.5 is like 550$ and photography 35mm 1.4 is about 430. A bit over your budget but its really cheap for what u get in quality.
Also in making movies u rarely zoom or pan the scene. It requires some experience to make these actions look good and not amateurish.
Cheapest way for a good lens is get the EF 50mm 1.8II. Its about 100$. But on ur APS-C camera its a bit close...not so versatile. Next option would be EF 35mm f2.0 about 250$. its kinda like 50mm on FF sensor and somewhat like the normal field of view we humans have.
And if u really need wide angle sometimes, just use the 18mm of your kit lens.
The last reaaalllyy cheap way is to get an m42 Adapter on ebay and a lens (or more lenses) with m42 mount.
They work like normal on ur DSLR only problem is there is no autofocus. But in filming u dont use autofocus anyway and always manual focus
So there really is not disavantage. Ok..apertures are mostly 1.8 - 2.8 and not wider.
Lenses just cost like ~50 bucks often. Not too rare there are way cheaper lenses. Good brands are Yashica, Takumar, vivitar, zeiss etc.
FD lenses work too but then u can just get an adapter. u need to really modify the lens mount with screws n stuff til u can use it.
m42---- add adapter = ready for shooting ^^ adpater like..10$. make sure u get one made of metal. with chip not needed unless u also wanna manual focus using the optical viewfinder sometimes.
For example with flektogon 35mm 2.4 and 600D:Zeiss Flektogon 35mm 2.4
I got the 35mm flektogon 2.8 and two other lenses for 100$ from some guy in my town
But the flektogon is usually more expensive than other lenses cuz its just....a Zeiss lens.
But the ability to macro with it is really cool too
as u can see in the video.
After all i think u dont need super modern ultra sharp lenses since 1080 HD is not even 3 megapixels. And even old lenses sure can perform that resolution well
You will never reach the point even closely where ur sensor outperforms the lens in DSLR filming