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doc:appunti:hardware:canon_s120

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doc:appunti:hardware:canon_s120 [2019/03/22 11:50] – [Neutral Density Filter] niccolodoc:appunti:hardware:canon_s120 [2020/10/31 08:33] (current) – [Exif Tags] niccolo
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 ^ Exif.CanonCs.AFPoint  | Auto-Focus frame setting. Exiv2 library is incomplete or misleading, here it is the true meaning of values:\\ ''(0)'' => **None** (Manual Focus)\\ ''(16390)'' => **Face AiAF**\\ ''Manual AF point selection'' => **1-point**  | ^ Exif.CanonCs.AFPoint  | Auto-Focus frame setting. Exiv2 library is incomplete or misleading, here it is the true meaning of values:\\ ''(0)'' => **None** (Manual Focus)\\ ''(16390)'' => **Face AiAF**\\ ''Manual AF point selection'' => **1-point**  |
 ^ Exif.CanonSi.SubjectDistance  | Subject distance, as per manual focus or Auto-Focus. The number seems to be the **distance in cm**, where **infinity** is reported as **6553**.   | ^ Exif.CanonSi.SubjectDistance  | Subject distance, as per manual focus or Auto-Focus. The number seems to be the **distance in cm**, where **infinity** is reported as **6553**.   |
 +^ Exif.CanonSi.0x0014  | According to Exiftool source code, this should be **FocusDistanceLower**, where the //SubjectDistance// is actually the **FocusDistanceUpper**. It is supposed that the camera knowns not the actual subject distance, but just two distances where the focus point is in between.  |
 ^ Exif.Canon.0x0027  | This multi-byte tag contains, among others, **Dynamic Range Correction** and **Shadow Correct** settings. Byte 4 (counting from zero) is a bitwise representation, under investigation.\\ Byte 16 is the Dynamic Range Correction:\\ 0 => **Off**\\ 1 => **Auto**\\ 200 => **200%**\\ 400 => **400%**  | ^ Exif.Canon.0x0027  | This multi-byte tag contains, among others, **Dynamic Range Correction** and **Shadow Correct** settings. Byte 4 (counting from zero) is a bitwise representation, under investigation.\\ Byte 16 is the Dynamic Range Correction:\\ 0 => **Off**\\ 1 => **Auto**\\ 200 => **200%**\\ 400 => **400%**  |
 ^  ISO Speed  ^^ ^  ISO Speed  ^^
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 For example you can use it to allow an **high aperture value** and get a **lower depth of field**. For example you can use it to allow an **high aperture value** and get a **lower depth of field**.
 +
 +====== Python Script Download ======
 +
 +Here it is a Python script to decode Exif metadata from photos taken by the Canon PowerShow S120: **{{.:canon_s120:canon-metadata.txt|canon-metadata}}**.
 +
 +====== Web References ======
 +
 +  * **[[https://www.exiv2.org/tags-canon.html|Exiv2 - Canon MakerNote Tags]]**
 +  * **[[https://www.dpreview.com/forums/post/35260903|Wow.... focus distance reported in EXIF???]]**
 +  * **[[https://photo.stackexchange.com/questions/105977/what-is-focus-distance-lower-upper-and-how-is-it-different-from-depth-of-field|What is “focus distance lower/upper” and how is it different from depth of field?]]**
 +  * **[[https://www.dpreview.com/forums/post/51962463|Distance in EXIF]]**
doc/appunti/hardware/canon_s120.1553251801.txt.gz · Last modified: by niccolo