Ricoh GXR GR Lens A12 28mm F2.5
Specs
| Brand: | Ricoh |
| Model: | GXR GR Lens A12 28mm F2.5 |
| Megapixels: | 12.30 |
| Sensor: | 23.6 x 15.7 mm |
| Price: | check here » |
Sensor info
Ricoh GXR GR Lens A12 28mm F2.5 comes with a
23.6 x 15.7 mm CMOS sensor, which has a diagonal of
28.35 mm (1.12") and a surface area of
370.52 mm².
If you want to know about the accuracy of these numbers,
click here.
Actual sensor size
Note: Actual size is set to screen → change »
This is the actual size of the GXR GR Lens A12 28mm F2.5 sensor: 23.6 x 15.7 mm
The sensor has a surface area of 370.5 mm².
There are approx. 12,300,000 photosites (pixels) on this area.
Pixel pitch, which is a measure of the distance between pixels, is 5.49 µm.
Pixel pitch tells you the distance from the center of one pixel (photosite) to the center of the next.
Pixel or photosite area is 30.14 µm². The larger the photosite, the more light it can capture and the more information can be recorded.
Pixel density tells you how many million pixels fit or would fit in one square cm of the sensor. Ricoh GXR GR Lens A12 28mm F2.5 has a pixel density of 3.31 MP/cm².
These numbers are important in terms of assessing the overall quality of a digital camera. Generally, the bigger (and newer) the sensor, pixel pitch and photosite area, and the smaller the pixel density, the better the camera. If you want to see how GXR GR Lens A12 28mm F2.5 compares to other cameras, click here.
Pixel or photosite area is 30.14 µm². The larger the photosite, the more light it can capture and the more information can be recorded.
Pixel density tells you how many million pixels fit or would fit in one square cm of the sensor. Ricoh GXR GR Lens A12 28mm F2.5 has a pixel density of 3.31 MP/cm².
These numbers are important in terms of assessing the overall quality of a digital camera. Generally, the bigger (and newer) the sensor, pixel pitch and photosite area, and the smaller the pixel density, the better the camera. If you want to see how GXR GR Lens A12 28mm F2.5 compares to other cameras, click here.
Specifications
| Brand: | Ricoh |
| Model: | GXR GR Lens A12 28mm F2.5 |
| Effective megapixels: | 12.30 |
| Total megapixels: | 12.90 |
| Sensor size: | 23.6 x 15.7 mm |
| Sensor type: | CMOS |
| Sensor resolution: | 4296 x 2864 |
| Max. image resolution: | 4288 x 2848 |
| Crop factor: | 1.53 |
| Optical zoom: | 1x |
| Digital zoom: | Yes |
| ISO: | Auto, Auto-Hi, 200, 400, 800,1600, 3200 |
| RAW support: | |
| Manual focus: | |
| Normal focus range: | 20 cm |
| Macro focus range: | 1 cm |
| Focal length (35mm equiv.): | 28 mm |
| Aperture priority: | Yes |
| Max aperture: | f2.5 |
| Max. aperture (35mm equiv.): | f3.8 |
| Depth of field: | simulate → |
| Metering: | Multi, Center-weighted, Spot |
| Exposure Compensation: | ±4 EV (in 1/3 EV steps) |
| Shutter priority: | Yes |
| Min. shutter speed: | 180 sec |
| Max. shutter speed: | 1/3200 sec |
| Built-in flash: | |
| External flash: | |
| Viewfinder: | Electronic (optional) |
| White balance presets: | 5 |
| Screen size: | 3" |
| Screen resolution: | 920,000 dots |
| Video capture: | |
| Storage types: | SD/SDHC, Internal |
| USB: | USB 2.0 (480 Mbit/sec) |
| HDMI: | |
| Wireless: | |
| GPS: | |
| Battery: | Lithium-Ion DB-90 rechargeable battery |
| Weight: | 140 g |
| Dimensions: | 113 x 70 x 56 mm |
| Year: | 2010 |
Compare GXR GR Lens A12 28mm F2.5 with another camera
Popular comparisons:
- Ricoh GXR GR Lens A12 28mm F2.5 vs. Fujifilm FinePix X100
- Ricoh GXR GR Lens A12 28mm F2.5 vs. Ricoh GR
- Ricoh GXR GR Lens A12 28mm F2.5 vs. Sigma DP2 Merrill
- Ricoh GXR GR Lens A12 28mm F2.5 vs. Olympus OM-D E-M5
- Ricoh GXR GR Lens A12 28mm F2.5 vs. Fujifilm X-E1
- Ricoh GXR GR Lens A12 28mm F2.5 vs. Fujifilm X-Pro1
- Ricoh GXR GR Lens A12 28mm F2.5 vs. Leica X2
- Ricoh GXR GR Lens A12 28mm F2.5 vs. Leica M8.2
- Ricoh GXR GR Lens A12 28mm F2.5 vs. Sony Alpha NEX-6
- Ricoh GXR GR Lens A12 28mm F2.5 vs. Sony Cyber-shot DSC-RX1
- Ricoh GXR GR Lens A12 28mm F2.5 vs. Ricoh GXR A12 50mm F2.5 Macro
Diagonal
Diagonal is calculated by the use of Pythagorean theorem:
where w = sensor width and h = sensor height
| Diagonal = √ | w² + h² |
Ricoh GXR GR Lens A12 28mm F2.5 diagonal:
w = 23.60 mm
h = 15.70 mm
h = 15.70 mm
| Diagonal = √ | 23.60² + 15.70² | = 28.35 mm |
Surface area
Surface area is calculated by multiplying the width and the height of a sensor.
Width = 23.60 mm
Height = 15.70 mm
Surface area = 23.60 × 15.70 = 370.52 mm²
Width = 23.60 mm
Height = 15.70 mm
Surface area = 23.60 × 15.70 = 370.52 mm²
Pixel pitch
Pixel pitch is the distance from the center of one pixel to the center of the
next measured in micrometers (µm). It can be calculated with the following formula:
| Pixel pitch = | sensor width in mm | × 1000 |
| sensor resolution width in pixels |
Ricoh GXR GR Lens A12 28mm F2.5 pixel pitch:
Sensor width = 23.60 mm
Sensor resolution width = 4296 pixels
Sensor resolution width = 4296 pixels
| Pixel pitch = | 23.60 | × 1000 | = 5.49 µm |
| 4296 |
Pixel area
The area of one pixel can be calculated by simply squaring the pixel pitch:
You could also divide sensor surface area with effective megapixels:
Pixel area = pixel pitch²
You could also divide sensor surface area with effective megapixels:
| Pixel area = | sensor surface area in mm² |
| effective megapixels |
Ricoh GXR GR Lens A12 28mm F2.5 pixel area:
Pixel pitch = 5.49 µm
Pixel area = 5.49² = 30.14 µm²
Pixel area = 5.49² = 30.14 µm²
Pixel density
Pixel density can be calculated with the following formula:
You could also use this formula:
| Pixel density = ( | sensor resolution width in pixels | )² / 1000000 |
| sensor width in cm |
You could also use this formula:
| Pixel density = | effective megapixels × 1000000 | / 10000 |
| sensor surface area in mm² |
Ricoh GXR GR Lens A12 28mm F2.5 pixel density:
Sensor resolution width = 4296 pixels
Sensor width = 2.36 cm
Pixel density = (4296 / 2.36)² / 1000000 = 3.31 MP/cm²
Sensor width = 2.36 cm
Pixel density = (4296 / 2.36)² / 1000000 = 3.31 MP/cm²
Sensor resolution
Sensor resolution is calculated from sensor size and effective megapixels. It's slightly higher
than maximum (not interpolated) image resolution which is usually stated on camera specifications.
Sensor resolution is used in pixel pitch, pixel area, and pixel density formula.
For sake of simplicity, we're going to calculate it in 3 stages.
1. First we need to find the ratio between horizontal and vertical length by dividing the former with the latter (aspect ratio). It's usually 1.33 (4:3) or 1.5 (3:2), but not always.
2. With the ratio (r) known we can calculate the X from the formula below, where X is a vertical number of pixels:
3. To get sensor resolution we then multiply X with the corresponding ratio:
Resolution horizontal: X × r
Resolution vertical: X
1. First we need to find the ratio between horizontal and vertical length by dividing the former with the latter (aspect ratio). It's usually 1.33 (4:3) or 1.5 (3:2), but not always.
2. With the ratio (r) known we can calculate the X from the formula below, where X is a vertical number of pixels:
| (X × r) × X = effective megapixels × 1000000 → |
|
Resolution horizontal: X × r
Resolution vertical: X
Ricoh GXR GR Lens A12 28mm F2.5 sensor resolution:
Sensor width = 23.60 mm
Sensor height = 15.70 mm
Effective megapixels = 12.30
Resolution horizontal: X × r = 2864 × 1.5 = 4296
Resolution vertical: X = 2864
Sensor resolution = 4296 x 2864
Sensor height = 15.70 mm
Effective megapixels = 12.30
| r = 23.60/15.70 = 1.5 |
|
Resolution vertical: X = 2864
Sensor resolution = 4296 x 2864
Crop factor
Crop factor or focal length multiplier is calculated by dividing the diagonal
of 35 mm film (43.27 mm) with the diagonal of the sensor.
| Crop factor = | 43.27 mm |
| sensor diagonal in mm |
Ricoh GXR GR Lens A12 28mm F2.5 crop factor:
Sensor diagonal = 28.35 mm
| Crop factor = | 43.27 | = 1.53 |
| 28.35 |
35 mm equivalent aperture
Equivalent aperture (in 135 film terms) is calculated by multiplying lens aperture
with crop factor (a.k.a. focal length multiplier).
Ricoh GXR GR Lens A12 28mm F2.5 equivalent aperture:
Crop factor = 1.53
Aperture = f2.5
35-mm equivalent aperture = (f2.5) × 1.53 = f3.8
Aperture = f2.5
35-mm equivalent aperture = (f2.5) × 1.53 = f3.8
Enter your screen size (diagonal)
My screen size is
inches
Actual size is currently adjusted to screen.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.