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doc:appunti:hardware:olympus-e-m10-mark-ii [2019/12/13 18:16]
niccolo [Comparison with a Compact Camera]
doc:appunti:hardware:olympus-e-m10-mark-ii [2020/10/09 17:11]
niccolo [AEL/AFL and Back Button Focus]
Line 71: Line 71:
 ===== AEL/AFL and Back Button Focus ===== ===== AEL/AFL and Back Button Focus =====
  
-The **normal behavior** for autofocus and automatic exposure is to **press the shutter button halfway**: the camera performs AF/AE and generally keeps the values locked while you keep the button pressed halfway. Then you can **change framing** and **shoot** by pressing the button completely.+The **default behavior** for auto focus and auto exposure is to **press the shutter button halfway**: the camera performs both **AF** and **AE**, keeping the values locked while the button is pressed halfway. Then you can **change framing** and **shoot** by pressing the button completely. 
 + 
 +This behaviour can be **separately changed** for the three focusing modes: **S-AF**, **C-AF** an **MF** (single and continous auto focus, manual focus); the relevant menu is **Custom Menu** => **A. AF/MF** => **AEL/AFL**. 
 + 
 +The default is **mode1** for all the three focusing modes. **Automatic exposure** and **focus** are **both** performed when the button is pressed **half way** (only the exposure is performed in manual focus, obviously): 
 + 
 +{{.:olympus-e-m10:ael-afl-menu_s-af_mode1.jpg?200|}} 
 +{{.:olympus-e-m10:ael-afl-menu_c-af_mode1.jpg?200|}} 
 +{{.:olympus-e-m10:ael-afl-menu_mf_mode1.jpg?200|}} 
 + 
 +If you want **only** the **auto focus** function when the button is pressed **half way**, you can choose **mode2**. The **exposure is not locked**, it changes as you change the framing until you press the button completely: 
 + 
 +{{.:olympus-e-m10:ael-afl-menu_s-af_mode2.jpg?200|}} 
 +{{.:olympus-e-m10:ael-afl-menu_c-af_mode2.jpg?200|}} 
 + 
  
 This behavior can be changed, for example by **separating the AF and AE functions**. Only one of them will be associate to pressing the **shutter button halfway**, the other will be associated to another button, usually a **Fn key**. In general **the Fn button will be used first** (to activate AF or AE), the other //auto// function will be activated by pressing the shutter button halfway, just before completing the shot. This behavior can be changed, for example by **separating the AF and AE functions**. Only one of them will be associate to pressing the **shutter button halfway**, the other will be associated to another button, usually a **Fn key**. In general **the Fn button will be used first** (to activate AF or AE), the other //auto// function will be activated by pressing the shutter button halfway, just before completing the shot.
Line 109: Line 124:
 ^ Portrait    | According to manual, it **//produces beautiful skin tones//**.  | ^ Portrait    | According to manual, it **//produces beautiful skin tones//**.  |
 ^ e-Portrait  | The manual says about this mode that it **//produces smooth skin textures//**.  | ^ e-Portrait  | The manual says about this mode that it **//produces smooth skin textures//**.  |
 +
 +
 +
 +===== F-Stop Values =====
 +
 +Traditionally the **f-stop scale** is composed of values which distantiate each other by halving the light that is allowed to come in. A value of **f/1.0** means that the lens aperture (the hole diameter) is equal to the focal lenght. Each following stop value is obtained by multiplying the previous one by **the square root of 2**. So the value **f/1.4** means that the aperture is obtained by dividing the focal lenght by 1.4, and so on with **f/2.0**, **f/2.8**, **f/4.0**, **f/5.7**, ... The minimum aperture is usually obtained dividing the focal lenght by 16 or 22, thus the **f/16** or **f/22**.
 +
 +The Olympus E-M10 have aprture stops at 1/3 of each full stop values:
 +
 +^  Full F-Stop  ^  E-M10 F-Stop ^ Note  ^
 +|   **1.0** |         - |  |
 +|   **1.4** |         - |  |
 +|   **2.0** |         - |  |
 +|   **2.8** |         - |  |
 +|                   - |  |
 +|                 3.5 | Max aperture at 14 mm focal lenght.  |
 +|   **4.0** |   **4.0** |  |
 +|                 4.5 |  |
 +|                 5.0 |  |
 +|   **5.7** |   **5.6** | Max aperture at 42 mm focal lenght.  |
 +|                 6.3 |  |
 +|                 7.1 |  |
 +|   **8.0** |   **8.0** |  |
 +|                 9.0 |  |
 +|                10.0 |  |
 +|  **11.3** |  **11.0** |  |
 +|                13.0 |  |
 +|                14.0 |  |
 +|  **16.0** |  **16.0** |  |
 +|                18.0 |  |
 +|                20.0 |  |
 +|  **22.6** |  **22.0** |  |
  
 ===== OLYMPUS Image Share ===== ===== OLYMPUS Image Share =====
Line 131: Line 178:
  
   * **dcraw**   * **dcraw**
-  * **digikam** 
   * **rawtherapee**   * **rawtherapee**
 +  * **darktable**
 +  * **digikam**
   * **ufraw**   * **ufraw**
   * **lightzone** (missing in Debian)   * **lightzone** (missing in Debian)
   * **rawstudio** (missing in Debian)   * **rawstudio** (missing in Debian)
 +
 +<code>
 +dcraw -i -v PC150102.ORF
 +
 +Filename: PC150102.ORF
 +Timestamp: Sun Dec 15 11:27:45 2019
 +Camera: Olympus E-M10MarkII
 +Owner: Niccolo Rigacci                                                
 +ISO speed: 200
 +Shutter: 1/2000.0 sec
 +Aperture: f/3.5
 +Focal length: 14.0 mm
 +Embedded ICC profile: no
 +Number of raw images: 1
 +Thumb size:  3200 x 2400
 +Full size:   4640 x 3472
 +Image size:  4640 x 3472
 +Output size: 3472 x 4640
 +Raw colors: 3
 +Filter pattern: RG/GB
 +Daylight multipliers: 2.155587 0.934705 1.481107
 +Camera multipliers: 2.015625 1.000000 1.671875 0.000000
 +</code>
 ===== Comparison with a Compact Camera ===== ===== Comparison with a Compact Camera =====
  
-^              ^ Canon S120         ^ Olympus E-M10 Mark II  ^ +^              ^ Canon S120         ^ Olympus E-M10 Mark II\\ with M.ZUIKO 12-42 mm pancake lens  ^ 
-^ Weight         +^ Weight       217 g              514 g                  
-^ Size           |+^ Size         100 x 59 x 29 mm   120 x 83 x 75 mm       |
 ^ JPEG Images  | 4000 x 3000 24bit  | 4608 x 3456 24bit      | ^ JPEG Images  | 4000 x 3000 24bit  | 4608 x 3456 24bit      |
 +^ RAW Images   | 4192 x 3062 36bit  | 4640 x 3472 36bit      |
  
 ===== Web References ===== ===== Web References =====
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   * **[[https://www.wrotniak.net/photo/m43/em1.1-picmode.html|Olympus Picture Modes]]**   * **[[https://www.wrotniak.net/photo/m43/em1.1-picmode.html|Olympus Picture Modes]]**
   * **[[https://www.wrotniak.net/photo/m43/em1.1-picmode.f.html|i-Enhance, Vivid, Natural and Muted comparison]]**   * **[[https://www.wrotniak.net/photo/m43/em1.1-picmode.f.html|i-Enhance, Vivid, Natural and Muted comparison]]**
 +  * **[[http://lclevy.free.fr/cr2/|Understanding Canon RAW .CR2 files]]**
 +
doc/appunti/hardware/olympus-e-m10-mark-ii.txt · Last modified: 2020/10/31 18:34 by niccolo