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depth of field question

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dawood.ab View Drop Down
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Post Options Post Options   Quote dawood.ab Quote  Post ReplyReply Direct Link To This Post Topic: depth of field question
    Posted: 02 Aug 2012 at 6:22am
I just re-watched this DVD.. and I noticed that Karls used F3.2 on photographing the sea with rocks at 55 min.

Is that give a good DOF for a landscape!!

Usually, when I try to get a landscape Images I use f10 and greater, a lot of times, I delete my photo because it's not a sharp and doesn't has a good DOF.

as I tried apply what I learn on this dvd,, I get this pretty picture but at f13 with NDG 0.9 Filter.


Sunset on a Desert by dawood.abh, on Flickr
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horizon View Drop Down
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Post Options Post Options   Quote horizon Quote  Post ReplyReply Direct Link To This Post Posted: 02 Aug 2012 at 12:57pm
G'day Abdulhameed,

The DoF at F3.2 would normally be quite shallow, depending if the lens was focused @ infinity or if it was at minimal focal distance. So, the answer would be depending on what results where wanted to be achieved. And also Karl may have been trying to have a certain exposure time for the shot.

So depending on the lens used, where it's mostly sharp or where the lens OOF area is desired. For eg: if you want to make the foreground subject in focus, but everything else OOF, then using a wide aperture is desired. If the lens is at its sharpest at F3.5 - F4 (lens design), then at infinity, theoritically it could have the sharpest DoF at that focal length. Its a matter of knowing your equipment and where it's strengths and weaknesses are and working with those strengths.

Possibly one thing that is not considered when taking landscapes of sand dunes, basically you require a time of day where they is NO wind. Otherwise the image can look blurred, but its actually a fine sand being blown just above the surface. Even when using a fast shutterspeed it will look blurred because of the sand movement.

Also you will need to learn how to PP your photos to get the best out of the files for sharpening etc.

Hope this helps.

Regards,
Craig
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dawood.ab View Drop Down
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Post Options Post Options   Quote dawood.ab Quote  Post ReplyReply Direct Link To This Post Posted: 03 Aug 2012 at 12:55am
Interesting information,, Yes Karl decided to get a certain exposure time, so he get F3.2.

However, I think Karl wanted only the rocks and the wave to be sharp, so he didn't care about the rest of that picture.

Thank you Craig for the information that you have provided to us. It opens my mind on things that I was on dark side of it.

my best regards,
Abdulhameed
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Marian View Drop Down
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Post Options Post Options   Quote Marian Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jun 2013 at 7:35pm
I have a question regarding algo the DOF issue. Karl says, in one of his shootings of the sea rocks that, using a wide angle lens, the aperture at 3.2 should be fine. what is the relation between wide angle lens and big apertures?
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Post Options Post Options   Quote horizon Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jun 2013 at 11:44pm
Hi Maria,

Welcome to Karl's place, we hope you enjoy your stay.

The relationship is more to do with the distance between minimal focal distance and infinity and how far you are away from your subject and point of interest. Also with all lenses the characteristic of where the image is sharpest for a given DoF, WA Lenses can have quite acceptable IQ (Image Quality) at a relatively large aperture, but their sharpest IQ may be around F4 - F5.6 - F8, depending on the lens.

And shooting at a wider aperture may be the compromise between IQ DoF and Time. This is not taking into account the lens distortion affect and how that will bear on IQ and if you intend to do lens correction during PP.

Hope it helps.

Regards,
Craig
Camera's are tools, use what is right for you.
Please dont edit my photo's.
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Marian View Drop Down
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Post Options Post Options   Quote Marian Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2013 at 10:59pm
Thanks a lot Craig for the explanation. I will practice large aperture in landscapes with my 16-35.

Regards,
Marian
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