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--- doc:appunti:hardware:olympus-e-m10-mark-ii [2019/12/13 16:17] – [Acronyms from Olympus OM-D Camera Manual] niccolo
+++ doc:appunti:hardware:olympus-e-m10-mark-ii [2020/09/23 21:00] – [Comparison with a Compact Camera] niccolo
@@ Line 1: / Line 1: @@
-====== Olympus E-M10 Mark II - Mirrorless Camera ======
+====== Olympus E-M10 Mark II ======
+The **Olympus E-M10 Mark II**  is a mirrorless camera introduced in september 2015; it features a **4/3 sensor** (17.3 x 13.0 mm) capable of 4608 x 3456 pixels, an **OLED electronic viewfinder** with 2.36 Mpixels and a 3.5 inches touch screen. A feature that distinguishes this camera from other mirrorless ones, is the presence of **two adjustment dials** (in addition to the one which selects the mode and the on/off/flash lever). The dials, like the three Fn buttons, can be **freely assigned** among many functions.
+The camera, in combination with the **M.ZUIKO 12-42 mm pancake lens** (28-84 mm equiv.), is extremely compact and portable.
 {{.:olympus:olympus-e-m10-mark2.jpg?480|The Olympus E-M10 Mark II}}
@@ Line 105: / Line 109: @@
 ^ Portrait    | According to manual, it **//produces beautiful skin tones//**.  |
 ^ 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 =====
@@ Line 127: / Line 163: @@
   * **dcraw**
-  * **digikam**
   * **rawtherapee**
+  * **darktable**
+  * **digikam**
   * **ufraw**
   * **lightzone** (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 =====
+^              ^ Canon S120         ^ Olympus E-M10 Mark II\\ with M.ZUIKO 12-42 mm pancake lens  ^
+^ Weight       | 217 g              | 514 g                  |
+^ Size         | 100 x 59 x 29 mm   | 120 x 83 x 75 mm       |
+^ JPEG Images  | 4000 x 3000 24bit  | 4608 x 3456 24bit      |
+^ RAW Images   | 4192 x 3062 36bit  | 4640 x 3472 36bit      |
 ===== Web References =====
   * **[[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]]**
+  * **[[http://lclevy.free.fr/cr2/|Understanding Canon RAW .CR2 files]]**