Tamron Canon 10-24MM F3.5-4.5 Lens

This Tamron brand lens fits Canon DSLR model cameras only. The zoom range goes from 10mm to 24mm and has a varying F-stop. At 10mm you can open up to F3.5, once you zoom your lens to 24mm you can only open up to F4.5. This is considered a wide angle lens, and would not typically be used for Portrait work.