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canon 55-250 IS blur edge, anyone?

Started Jan 15, 2009 | Discussions thread
thien nguyen Senior Member • Posts: 1,369
Re: canon 55-250 IS blur edge, anyone?

You were shooting at 225mm which is quite a large focal length.
This will give you shallow DOF even at f9.

According to the DOF calculator, on a crop body, say, at 20m away,
the DOF is less than 3 metres and only about 1.6m behind the focus
plane.

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Thien

jongpl wrote:

Hi, I have recently bought a canon 55-250mm IS, after reading all the
comments on the internet, especially most people said that it
outperform the sigma 70-300 APO.
I was having difficulties to get shots focus properly with the sigma
on my 350D body. The canon does it slightly better but it doesn't
always got the focus right like my kit lens or the 50mm 1.8. The
biggest complain I had with the canon is the edge blur in the picture
which is not so bad in the sigma pic, so I am wondering if there is
anyone having same problem like mine? Or is my lens faulty?
I have some test on outdoor shooting, here are some:

canon 225mm f9 1/200s
full picture

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Canon EF 100-400mm F4.5-5.6L IS II
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