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#1
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Angle of view instead of focal length
Given the wide variety of sensor sizes, wouldn't it be better if the
EXIF of a photo contained also the angle of view information? The focal length of the lens is not really that important, actually it is quite irrelevant. -- Alfred Molon ------------------------------ Olympus E-series DSLRs and micro 4/3 forum at http://tech.groups.yahoo.com/group/MyOlympus/ http://myolympus.org/ photo sharing site |
#2
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Angle of view instead of focal length
On Tue, 02 Oct 2012 23:36:10 +0200, Alfred Molon wrote:
Given the wide variety of sensor sizes, wouldn't it be better if the EXIF of a photo contained also the angle of view information? The focal length of the lens is not really that important, actually it is quite irrelevant. Your point is well taken, but usually there is the actual focal length and a '35mm equivalent'. Personally, I think I'd rather see focal length divided by diagonal of the sensor. Then I'd know that 1.0 means it's a 'normal' view, less than 1.0 is 'wide angle' and greater than 1.0 'telephoto' and it would also give the magnification. |
#3
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Angle of view instead of focal length
Alfred Molon writes:
Given the wide variety of sensor sizes, wouldn't it be better if the EXIF of a photo contained also the angle of view information? The focal length of the lens is not really that important, actually it is quite irrelevant. Except for the fact that few of us are used to thinking in those terms, yes, I think it would. -- Googleproofaddress(account:dd-b provider:dd-b domain:net) Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info |
#4
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Angle of view instead of focal length
On 10/2/2012 2:36 PM, Alfred Molon wrote:
Given the wide variety of sensor sizes, wouldn't it be better if the EXIF of a photo contained also the angle of view information? The focal length of the lens is not really that important, actually it is quite irrelevant. Focal length would be a constant regardless of sensor size while the angle of view would a variable. However, the suggestion that the EXIF also include the angle of view, if one feels the need of it, might be an asset. |
#5
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Angle of view instead of focal length
On 3/10/2012 7:36 AM, Alfred Molon wrote:
Given the wide variety of sensor sizes, wouldn't it be better if the EXIF of a photo contained also the angle of view information? The focal length of the lens is not really that important, actually it is quite irrelevant. I have never though in angle of view with my DX format Nikons always in focal length. I'm aware of the angles of my 16mm and 20mm lenses that's all, but if you ask, I could not tell you, what the angles were for the rest of my lenses. It would be a stupid idea to know what the angle of view was for a 300mm or 500 mm lens. How would you replicate back to what lens you used. Things are in mm not angles. |
#6
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Angle of view instead of focal length
Alfred Molon wrote:
Given the wide variety of sensor sizes, wouldn't it be better if the EXIF of a photo contained also the angle of view information? The focal length of the lens is not really that important, actually it is quite irrelevant. I take you are unaware that there is indeed an EXIF field for the field of view in degrees. At least Nikon and Canon both provide that data. Examples: Camera Model Name : NIKON D3S Field Of View : 72.7 deg (1.96 m) Focal Length : 24.0 mm (35 mm equivalent: 24.0 mm) Camera Model Name : NIKON D4 Field Of View : 68.5 deg (2.04 m) Focal Length : 24.0 mm (35 mm equivalent: 26.0 mm) Camera Model Name : NIKON D800 Focal Length : 800.0 mm (35 mm equivalent: 800.0 mm) Field Of View : 2.5 deg (2.09 m) Camera Model Name : Canon EOS 60D Focal Length : 50.0 mm (35 mm equivalent: 78.6 mm) Field Of View : 25.8 deg -- Floyd L. Davidson http://www.apaflo.com/ Ukpeagvik (Barrow, Alaska) |
#7
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Angle of view instead of focal length
In article , Floyd L. Davidson says...
I take you are unaware that there is indeed an EXIF field for the field of view in degrees. At least Nikon and Canon both provide that data. Examples: Camera Model Name : NIKON D3S Field Of View : 72.7 deg (1.96 m) Focal Length : 24.0 mm (35 mm equivalent: 24.0 mm) Camera Model Name : NIKON D4 Field Of View : 68.5 deg (2.04 m) Focal Length : 24.0 mm (35 mm equivalent: 26.0 mm) Camera Model Name : NIKON D800 Focal Length : 800.0 mm (35 mm equivalent: 800.0 mm) Field Of View : 2.5 deg (2.09 m) Camera Model Name : Canon EOS 60D Focal Length : 50.0 mm (35 mm equivalent: 78.6 mm) Field Of View : 25.8 deg Interesting. Which cameras support this field? And is there a difference between field of view and angle of view? -- Alfred Molon ------------------------------ Olympus E-series DSLRs and micro 4/3 forum at http://tech.groups.yahoo.com/group/MyOlympus/ http://myolympus.org/ photo sharing site |
#8
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Angle of view instead of focal length
Alfred Molon wrote:
Given the wide variety of sensor sizes, wouldn't it be better if the EXIF of a photo contained also the angle of view information? The focal length of the lens is not really that important, actually it is quite irrelevant. Of focal length, sensor size and field of view you need (any) two. The third can be calculated. Since your viewing of EXIF is always mediated by software, this is a non-issue. BugBear |
#9
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Angle of view instead of focal length
In article , bugbear
says... Of focal length, sensor size and field of view you need (any) two. The third can be calculated. Since your viewing of EXIF is always mediated by software, this is a non-issue. Of course everything can be calculated, but actually focal length and sensor size are irrelevant. What really matters is the angle of view. -- Alfred Molon ------------------------------ Olympus E-series DSLRs and micro 4/3 forum at http://tech.groups.yahoo.com/group/MyOlympus/ http://myolympus.org/ photo sharing site |
#10
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Angle of view instead of focal length
Alfred Molon wrote:
In article , Floyd L. Davidson says... I take you are unaware that there is indeed an EXIF field for the field of view in degrees. At least Nikon and Canon both provide that data. Examples: Camera Model Name : NIKON D3S Field Of View : 72.7 deg (1.96 m) Focal Length : 24.0 mm (35 mm equivalent: 24.0 mm) Camera Model Name : NIKON D4 Field Of View : 68.5 deg (2.04 m) Focal Length : 24.0 mm (35 mm equivalent: 26.0 mm) Camera Model Name : NIKON D800 Focal Length : 800.0 mm (35 mm equivalent: 800.0 mm) Field Of View : 2.5 deg (2.09 m) Camera Model Name : Canon EOS 60D Focal Length : 50.0 mm (35 mm equivalent: 78.6 mm) Field Of View : 25.8 deg Interesting. Which cameras support this field? And is there a difference between field of view and angle of view? There are different values used for field or angle of view. Sometimes it's calculated across the sensor diagnonal, i.e. the diameter of the image circle, sometimes across the width of the sensor. The number I find much more photographically useful is the angle derived from the width across the sensor in normal (landscape) mode. That tells me how wide the standard view is without seriously tilting the camera to squeeze more width out corner to opposite corner across the diagonal. -- Chris Malcolm |
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