Is the Canon 22-55 f/4-5.6 a good lens for a non-APS Canon SLR, in my case an Elan 7? I noticed the ultra-wide 22 end and was thinking this would be ideal for outdoor landscape photography considering sometimes I want to go wider than my 28-105 and would like to have the flexiblity to go to the standard focal lengths of 50-55. One of its major attactions to me is that its only $105. It has a USM too! The slow speed doesnt really matter to me since I'll be shooting with a flash or outdoors. How is the image quality of this low price lens and how is the build quality? Does it have a plastic mount? Thanks.