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so does the image stablizer lenses focus slow...like the kit lenses...i want to buy a new lens but im not to sure what to get...i dont care to much for focus speed...dont plan on taking action shoots...i read that the IS lens bumps the shutter speed four times faster...something like that?...also what should i be lookin for if i want a lens that can focus good with low light?...
lol i already have a 1.8...i like it but the low DOF is what i dont like...im trying to get full body picsIf you're wanting something that works in low light, IS and USM won't help you there. You'll want a lens that's aperture can go way wide like f/1.8 or 1.4 if you can afford it. The wider the aperture, the more light is let in, allowing for more light to fill in a shorter time brightening pictures. The Canon 50mm f/1.8 is about $80 on Amazon, also called the nifty fifty. I've heard great things about it.
ahhh..that was my next question...thanks u already answered itThe USM helps with the focusing, it focuses fast and quietly. An IS lens will not focus slowly because every lens that has IS has USM as well (you won;t see lenses with IS and without USM), there are lenses with USM but without IS.
A lens to focus in low light it doesn;t mather that it has USM or IS, you need to have a big aperture opening ( like f/1.4 or f2.8) so that gets a lot of light into the camera so the sensor can focus easily
For example my 28-135mm IS USM lens with f/3.5 in a poorly lit situation can't focus doesn;t mathe how had i try, but if i put my 50mm lens f/1.8 without any fancy IS or USM i can focus easily if i open uo to f/1.8
Just different people trying to get your money.as far as brands...canon,tamron, and sigma whats the big difference them if any different at all