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Canon General / Autofocus Problem / Question
« on: September 19, 2011, 03:45:32 AM »
This is for those of you who have deeper tech understanding of what goes on inside the camera:
Question that is bothering me:
I have a rebel 550d (t2i) + canon 50mm 1.4 prime. Even when I try to carefully focus using the center focusing point only (which is supposed to be most sensitive) the prime often "just" misses and the picture is slightly / moderately blurry - depending on how wide I opened the lens. 1.4 - 2.5 are almost always slightly off. It does not seem to be a back/forward focus problem - just lack of capability to achieve sharp focus.
If I focus using the sensor in live view mode - the focus is almost always tack sharp - or at least much better, even wide open at 1.4 - and beyond 2 tack sharp.
1) Can someone explain this phenomenon?
2) Would a more advanced body (say a 60d ) have better autofocus results ? Is there a difference even using the CENTER focusing point between the 550d and the 60d ?
Thank you all
Question that is bothering me:
I have a rebel 550d (t2i) + canon 50mm 1.4 prime. Even when I try to carefully focus using the center focusing point only (which is supposed to be most sensitive) the prime often "just" misses and the picture is slightly / moderately blurry - depending on how wide I opened the lens. 1.4 - 2.5 are almost always slightly off. It does not seem to be a back/forward focus problem - just lack of capability to achieve sharp focus.
If I focus using the sensor in live view mode - the focus is almost always tack sharp - or at least much better, even wide open at 1.4 - and beyond 2 tack sharp.
1) Can someone explain this phenomenon?
2) Would a more advanced body (say a 60d ) have better autofocus results ? Is there a difference even using the CENTER focusing point between the 550d and the 60d ?
Thank you all
Killswitch, I agree with other posters that unless you have some need for what the 7d offers over the 60d or the Rebel line, I'd buy a less expensive body and put the balance into some more glass. Maybe an EF-S 60mm macro or a 35mm f/2? A telephoto zoom like the 55-250mm would be good buy as well. Enjoy your new purchases!
I am in no hurry to buy one but was wondering if buying the 7D now would be a wise decision. Any suggestion would be greatly appreciated!