Focus Issues

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Permalink Reply by tressillian on June 14, 2009 at 12:28am

Could be a combination of a number of things.....

1. Camera shake - make sure you have fast enough shutter speed to hand-hold. The rule of thumb is that you need to have a shutter speed that is equivalent to the focal length of your lens. So for example, if you are shooting a 50mm you need 1/50 sec, 200mm you need 1/200 sec, 300 mm you need 1/300 sec. etc..... If you don't have enough speed, decrease the aperture or boost the ISO.

2. Very shallow depth of field due to large apertures (small f/ number) - make sure you have a small enough aperture. At very large apertures there is only a very small amount of the target that will be in focus. For a 50mm f/1.8 lens (set at f/1.8) the depth of field will only be a few millimetres. There are lots of posts in the forums about depth of field - check them out.

Regards

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Permalink Reply by Dara Lork on June 17, 2009 at 8:02am

I have the same problem with my nikon D90 when i accidentally switch off the Built-in Assist Auto focus. Somtimes camera Auto focus is poor then a built-in assist Auto focus helps to get it right. I do not know if you 50D will have this function.

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Permalink Reply by Graham Thomas on October 7, 2009 at 5:42pm

Not being picky Joe , but that "line' is known as an "underscore". Cheers

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Permalink Reply by Jun Lomotan on October 7, 2009 at 7:32am

Maybe your lense has a back focusing or front focusing problem.

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Permalink Reply by igor on October 12, 2009 at 7:09am

its why i hate canon, pictures do have a soft look but that’s jest me i have friends that use and create amazing work with it

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Permalink Reply by Jova on October 12, 2009 at 12:32pm

Take two shot as you describe and post them here. That will help us to see what's going on.
Btw don't use auto mode if you don't really good lens, canon always picking smallest F number. Try to take few shot in P mode instead.
What lens do you using?

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