Canon 450D and Canon EF 28-135mm f/3.5-5.6 IS USM?
if i buy this lens what will be my focal length with the crop factor of 450D sensor? should i buy this than EF-S 55-250 IS, i need a good zoom with a nice price and features like USM and in low light.
Best Answer
If low light performance is important to you, then a lens that can only go to f/5.6 on the long end isn't a good solution for you.
Check out the Canon website, they have all their lenses listed. Sounds like you need an f/2.8 lens.
Your crop factor is 1.6, so simply multiply the focal length by that.
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