Canon Rebel lens help. What about Sigma lenses?? Any good?

I was looking at the sigma lenses.
My question is how good are they & will they allow me to use all the
features on my camera?
For example...
I can only adjust mt F-Stop on my camera NOT on the canon lenses.
I see that the Sigma lenses have the F-Stop adjustments on the lens itself.
Can I still adjust my F-Stop through the camera with the SIgma?
If not, how will full auto mods ever work?
Thanks for your help & advice/
Ray




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