Sigma 30mm 1.4 EX DC HSM for Canon 550D / Rebel t2i?

[POLARbear510]

Hi.

I'm considering buying a Sigma 30mm 1.4 EX DC HSM for my Canon 550D/Rebel t2i. I just want to know if the Sigma 30mm would be the same 30mm as if it would be on a Canon 18-55mm kit lens (meaning, if I set the zoom at around 30mm, would it be as wide) ?

I have a Canon 50mm 1.8 and I LOVE the shallow depth of field and it's ability to capture low light photos/videos. The only problem is that it's more of a portrait lens. For example, I need to be very far from the subject if I wanted a wide-angle shot while using the Canon 50mm. I want something wider with the same ability, which is why I'm considering buying the Sigma 30mm 1.4.

I've read in different forums and I've gotten confused because I have a crop sensor camera. It supposedly would result the 30mm would actually be equivalent to a 50mm.

I don't want to buy the same lens. Would the Sigma 30mm be wider than the Canon 50mm on my camera? Any recommendations for a wide angle, low light capability and shallow depth of field? Thanks.

 

[retiredPhil]

Yes, 30mm is 30mm whether its fixed focal length or zoomed.

Yes, 30mm focal length is wider than 50mm. They are both expressed in 35mm equivalent.

While the 30mm is indeed wider than the 50mm, I wouldn't consider it a wide angle lens on your APS sensor. Suggest you look over the Wide Angles on the Canon site.
http://www.usa.canon.com/cusa/consumer/products/cameras/ef_lens_lineup

The Sigma 19mm F2.8 EX DN looks like it might fill your needs.
http://www.sigmaphoto.com/shop/19mm-f28-ex-dn