Just a couple of questions I'll not bore you all, I just bought a new lense 55-250IS ,what I am wondering is why does it have a switch to turn the IS on and off? why would you need it it off don't people like crisp images all the time?
And also I have been looking at images from this forum which are amazing by the way but what I'm wanting to know is do you all use manual focus on your pictures or do you use auto focus? The problem I'm havin is that I can never seem to get a clean crisp image all the time when I'm in manual but when set to auto the picture always turns out better.

Thanks for any advice in advance

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