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General photography questions and answers: Discuss Centre weight focus issues....When using the centre weight focus point on my 60d, say on an insects eye, once focus is locked on ...
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Old 20-04-2013, 23:59   #1 (permalink)
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Centre point focus issues.

When using the centre weight focus point on my 60d, say on an insects eye, once focus is locked on and the shot taken, when I expect to see the eye in focus on my computer, the actual point in focus is actually below the eye.
I am having too focus the point higher then shoot. Is this correct or am I using the wrong focusing method for macro. I am using Auto focus and manual focus and a canon 100 mm macro.

Any help appreciated.

Last edited by Zugara; 21-04-2013 at 09:10.
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Old 21-04-2013, 08:17   #2 (permalink)
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Re: Centre weight focus issues.

Centre-weight average is a term for setting the exposure, not focus. If you're referring to the centre point on the focus screen, I'd ask whether the camera focusses correctly using another lens - and if the manual focus is out, try adjusting the diopter to match your eye
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Old 21-04-2013, 08:37   #3 (permalink)
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Re: Centre weight focus issues.

I'd agree with Mark, but if somewhat obvious - are you actually setting the centre focus point correctly, or are you setting the exposure as Mark said instead of the focus point?
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Old 21-04-2013, 08:50   #4 (permalink)
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Re: Centre weight focus issues.

Yeah, sorry guys, bit fuzzy last night As both have said, its the centre focus point. When focusing obviously it bleeps red when the item is in focus, so I am assuming that that is the point with most clarity.

When I upload to the PC, the actual clear point is below what i focused on
Typical example was yesterday, I got a shot of a hover fly resting on a leaf, using L100 ef lens, 1:1 manual focus, the centre point flashed red on the eyes, great, uploaded to PC, now the focus point has shifted to the area behind the eye! No wind, hover fly remained still for me,on a tripod, I could see fine details of hairs and pollen, great, nice and sharp but why does the focus point move. Tried again on a ladybug, sitting pretty, focus.......eyes......shoot. No, upload to PC got a great shot of the spots eyes outta focus.

diopter is in tune with my eyesight as well
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Old 21-04-2013, 10:26   #5 (permalink)
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Re: Centre weight focus issues.

im confused, if i use manual focus the centre point doesnt flash anything, that only happens in auto focus. well on my camera anyway
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Old 21-04-2013, 10:29   #6 (permalink)
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Re: Centre weight focus issues.

Apart from the above remarks you might find it useful to perform a simple check. You can easily test whether the focus unit is in-line with the markings in the viewfinder by taking a vertical sharp edge and an horizontal sharp edge (each test separately) such as the edge of a window. In continuous servo mode hold down the shutter for focussing and line the camera up on a subject outside the window. Keeping the focussing active, move the camera slowly over the sharp edge until it changes focus. If this is inside or at the edge of the focus point then your focus unit is lined up OK. If however, it triggers a change of focus outside the viewfinder point, you know it is not lined up precisely as expected. (keep square-on to the edge)

You may also find that your camera is choosing a point slightly closer to you than you expect - this happens, for instance when taking a shot over/along a slanting object and the only way round this is manual focus.
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Old 21-04-2013, 13:12   #7 (permalink)
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Re: Centre weight focus issues.

I think this is almost sure to be human error.
Use manual focus.
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