[hkicpa]

May I know what is USM?


Is there a big difference between Canon EF 50mm f/1.4 USM and Cannon EF 50mm f/1.8 II??


Is it ok for 350D to equip the follwing lens?

1. EF 50mm f/1.4 USM or EF 50mm f/1.8 II
2. Sigma 17-70mm f/2.8-4.5 DC Macro or EF-S 17-85mm IS

[tyuen]

USM = Ultra Sonic Motor. This is supposed to be silent and fast autoocus. Canon has 2 types of USM, the better one is ring USM. 50/1.4 does not use ring USM, however.

[beancurdbean]

I prefer new DSLR user buy EFS17-85 IS + 50/f1.8 II

[mewmowmow]

If you use 350D, suggest to buy 1.8 because it is budget buy.

If you use 20D or 30d, you can consider to use 1.4 USM.

[Canon10DUser]

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[hkicpa]

Thanks!!!

How about EF 35mm f/2.0 compare with EF50/1.4 USM?

I am also concerning of 1.6x effect for 350D