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 Fondly Remembered
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Join Date: Sep 2007
Location: Perthshire Scotland
Posts: 8,168
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Quote:
Originally Posted by kcjack
What would that be on the dial, going to play tomorrow, I think I need to phone college for a photography course. I love photos but not techy minded.
Look for something like AV (aperture value) or AP (aperture priority) on yours.
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Kit 1 Canon 1D Mark 3 Canon EF 17-40mm f/4 L USM Canon EF 24-105mm f/4 L IS USM Canon EF 100-400mm f/4.5-5.6 L IS USM Canon EF 50mm f/1.8 II |
Kit 2 1D2 & 40D |
 Senior Member
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Join Date: Aug 2008
Location: Portsmouth, Hants, England
Posts: 622
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Quote:
Originally Posted by SteveL
Did you know that the zone of focus extends for 1/3rd in front and 2/3rds behind the focus point.
What this means is that in the example above if you could have turned to manual focus after focusing with AF, and moved the focus point slightly nearer the camera manually you would have been able to keep the flowers in the foreground in focus and those further back also.
If that does not make sense, blame it on the cider I've been drinking
Steve
What this means is that in the example above if you could have turned to manual focus after focusing with AF, and moved the focus point slightly nearer the camera manually you would have been able to keep the flowers in the foreground in focus and those further back also.
If that does not make sense, blame it on the cider I've been drinking
Steve
That is a bit of a generalisation Phil.
Below is a table that shows how much DoF you get in front and behind depending on the lenght of lens you use. These figures are taken at F4.0 on a body using a 1.6 crop factor sensor
Distribution of the Depth of Field
Focal Length (mm) Rear Front
10 70.2 % 29.8 %
20 60.1 % 39.9 %
50 54.0 % 46.0 %
100 52.0 % 48.0 %
200 51.0 % 49.0 %
400 50.5 % 49.5 %
So on a long lens, its almost 50/50.
Alan.
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Kit 1 Canon 5D Mk11 EF 85mm F1.2 L EF 17-40 F4 L EF 100-400 F4.5-F5.6 L EF 50mm F1.8 Sigma F2.8 28-70mm |
Kit 2 Canon EOS 30D EF-S 18-55mm EF 35-105mm EF 70-300 |
Other Kit View my profile to see my other kit! |
 Senior Member
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Join Date: Sep 2007
Location: South East
Posts: 1,753
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Quote:
Originally Posted by WildWalker
Below is a table that shows how much DoF you get in front and behind depending on the lenght of lens you use. These figures are taken at F4.0 on a body using a 1.6 crop factor sensor
Distribution of the Depth of Field
Focal Length (mm) Rear Front
10 70.2 % 29.8 %
20 60.1 % 39.9 %
50 54.0 % 46.0 %
100 52.0 % 48.0 %
200 51.0 % 49.0 %
400 50.5 % 49.5 %
So on a long lens, its almost 50/50.
Distribution of the Depth of Field
Focal Length (mm) Rear Front
10 70.2 % 29.8 %
20 60.1 % 39.9 %
50 54.0 % 46.0 %
100 52.0 % 48.0 %
200 51.0 % 49.0 %
400 50.5 % 49.5 %
So on a long lens, its almost 50/50.
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Kit 1 Canon 20D Canon 28-135 3.5-5.6 IS USM Canon 70-300 4-5.6 IS USM Canon 100 2.8 USM Macro Canon 10-22mm 3.5-4.5 Canon 50mm 1.4 Canon 85mm 1.8 |
Other Kit View my profile to see my other kit! |
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My Compact/P&S: Canon Ixus V3 |
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Senior Member
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Join Date: Aug 2008
Location: Portsmouth, Hants, England
Posts: 622
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The link is at work GreyHawk.
Was there a particular reason you wanted it?
Alan.
Was there a particular reason you wanted it?
Alan.
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Kit 1 Canon 5D Mk11 EF 85mm F1.2 L EF 17-40 F4 L EF 100-400 F4.5-F5.6 L EF 50mm F1.8 Sigma F2.8 28-70mm |
Kit 2 Canon EOS 30D EF-S 18-55mm EF 35-105mm EF 70-300 |
Other Kit View my profile to see my other kit! |