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FORUMS ➔ Cameras, Lenses & Accessories ➔ Canon Lenses 
Thread started 31 Oct 2006 (Tuesday) 23:05
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fritz1
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Oct 31, 2006 23:05 |  #1

I took these with my 100-300 usm and can't figure out what I did or is my lens off, one or two came out ok but not great

#1 1/500 f8 300mm iso 200
#2 1/640 f8 300mm iso 200


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liza
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Oct 31, 2006 23:10 |  #2
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They're both out of focus. Is the switch on the lens set to AF?


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fritz1
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Oct 31, 2006 23:12 |  #3

These were taken the same time
#1 1/640 f9 200 iso 300mm
#2 1/400 f7.1 200 iso 300mm

Any help or suggestions are appreciated
all were handheld, can it be camera shake at that speed?


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Inspired ­ Photography
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Oct 31, 2006 23:17 as a reply to  @ fritz1's post |  #4

If you open the images up in the Canon software, then you can see which focus points were used for the image. That might answer your question.

Thanks

Rob

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fritz1
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Oct 31, 2006 23:20 |  #5

I use the center point on the head and recompose

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fritz1
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Oct 31, 2006 23:26 |  #6

liza wrote in post #2198752 (external link)
They're both out of focus. Is the switch on the lens set to AF?

I checked the switch and it's on AF thanks for reminding

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Oct 31, 2006 23:27 as a reply to  @ fritz1's post |  #7

You've simply mis-focused - it happens, get over it. :lol:

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Oct 31, 2006 23:33 as a reply to  @ cwphoto's post |  #8

1 and 2 looked like it locked onto the water.......

Just look at this..........


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Look at where it locked...............:lol:

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fritz1
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Oct 31, 2006 23:34 |  #9

I suppose it's possible I just thought there were no particular spot on the original image that was very sharp it seemed like it would beep but it was not come into focus

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Skip ­ Souza
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Nov 01, 2006 00:16 |  #10

AlexMa wrote in post #2198820 (external link)
1 and 2 looked like it locked onto the water.......

Look at where it locked...............:lol:

I agree. I see that you really nailed the focus on that gal's ear :lol:

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Choderboy
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Nov 01, 2006 00:27 as a reply to  @ Skip Souza's post |  #11

In the first 2 pics it looks like focus was beyond the bird.
Really looks like you can see the limits of the DOF on the water - more obvious in the second shot.

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Nov 01, 2006 07:40 as a reply to  @ Choderboy's post |  #12

Good thing for monkeys!


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fritz1
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Nov 01, 2006 08:00 |  #13

Thanks for all the replies, I,ll keep trying and see if it does it again I could have sworn I locked on the bird's head.

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Thordic
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Nov 01, 2006 08:11 |  #14

It happens a lot when shooting birds on the water, I find. I have a ton of problems focusing my bigma on birds in the water. Geese and other long-necked birds just make the problem worse. Egrets are the absolute worst.

I just shoot twice as many pictures and try to focus the best I can. You can always delete the OOF ones afterwards :)

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Nov 01, 2006 08:20 as a reply to  @ fritz1's post |  #15

1. Occasional bad focus in auto mode happens. Even with my 1DsMkII (although less often)

2. You need to apply some sharpening to the images (in camera or post processing)

3. Your lens is contributing to the softness (try the lens at 100mm and 200mm (I don't know where the good spot on the 100-300 is). Based on the MTF charts that lens has very poor sharpness at 300mm (even at f8 ), much better (as in decent to good) at 100mm (although it deteriorates quickly at wide open aperture).

4. Some of the blur in the 4th picture is bird movement.

So the solution is bring the lens down off 300mm, keep it at f8, apply some sharpening and accept that some of the images will miss-focus.

A final note the actual focus point is larger then the square that shows in the lens and in some rare cases can be offset slightly making the problem worse in one direction. I would play with the camera to see just where the actual focus points are. As example on my old D60 I found the actual focus point was almost twice the size of the square shown and would always go for the most contrasty object in its field of view, which meant I got a lot of backgrounds in focus and fuzzied out the models. At least until I figured it out.

hope that helps,

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