Film SLR lens to DSLR body :/ need help

[xarik]

Hey guys, I did a stupid thing...but it didn't cost much so I feel ok atm

I purchased this lens for $20

http://www.pentaxforums.com/userreviews/sigma-35-80mm-f4-5-6-dl-af.html

it fits onto the camera, auto focuses and even takes pictures within it's F-stop range (it won't take it if it's too bright outside, I get error 01 contact needs to be cleaned) It'll take a video but it'll give me some pretty bad changes in lighting differences (when brought from dark to light it'll turn the video white and then fix itself)

I purchased it for use on a t1i or t2i camera and it'll go on and take some pictures like I said, but I just want to know if there's an adapter out there for it so I can get good performance. it's no where near ready to be used the way it is :/

 

[xarik]

anybody know?

 

[Kornowski]

How are you attaching it to the camera, do you have a K mount to EF mount adaptor? If so, there's not much you can do make it work any better. That's it, it's attached.

I'm surprised autofocus works, I've never had it work when using different mount lenses on my Canon. I've seen adaptors with the focus confirm but never autofocus.

 

[xarik]

Well the lens is a Sigma 35-80 F4-5.6 Canon

http://milwaukee.craigslist.org/ele/3917989753.html

That's the exact lens it's my posting haha

It just clicks right one! It has F-stop issues and lighting issues when changing from light extremes. So there isn't an adapter for older lenses? It goes on just fine and auto focuses and does video and everything. It just wont' take pictures sometimes and freaks out. It likes dark pictures but nothing that has any sunlight in it lol