So sánh canon eos 77d và eos 800d năm 2024
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Sensor size is generally a good indicator of the quality of the camera. Sensors can vary greatly in size. As a general rule, the bigger the sensor, the better the image quality. Show
Bigger sensors are more effective because they have more surface area to capture light. An important factor when comparing digital cameras is also camera generation. Generally, newer sensors will outperform the older. Learn more about sensor sizes » Actual sensor sizeNote: Actual size is set to screen → vs 1 : 1 (ratio) Canon EOS 800D Canon EOS 77D Surface area: Difference: 0 mm² (0%) 800D and 77D sensors are the same size. Pixel pitch tells you the distance from the center of one pixel (photosite) to the center of the next. It tells you how close the pixels are to each other. The bigger the pixel pitch, the further apart they are and the bigger each pixel is. Bigger pixels tend to have better signal to noise ratio and greater dynamic range. Difference: 0 µm (0%) 800D and 77D have the same pixel pitch. Pixel area 13.69 µm² 13.69 µm² Pixel or photosite area affects how much light per pixel can be gathered. The larger it is the more light can be collected by a single pixel. Larger pixels have the potential to collect more photons, resulting in greater dynamic range, while smaller pixels provide higher resolutions (more detail) for a given sensor size. Relative pixel sizes: Pixel area difference: 0 µm² (0%) Canon 800D and Canon 77D have the same pixel area. Pixel density tells you how many million pixels fit or would fit in one square cm of the sensor. Higher pixel density means smaller pixels and lower pixel density means larger pixels. Difference: 0 µm (0%) Canon 800D and Canon 77D have the same pixel density. To learn about the accuracy of these numbers, click here. SpecsTotal megapixels 25.80 25.80 Effective megapixels 24.20 24.20 ISO sensitivity Auto, 100-25600 (expandable to 51200) Auto, 100-25600 (expandable to 51200) Focal length (35mm equiv.) Aperture priority Yes Yes Max. aperture (35mm equiv.) n/a n/a Metering Multi, Center-weighted, Spot, Partial Multi, Center-weighted, Spot, Partial Exposure compensation ±5 EV (in 1/3 EV, 1/2 EV steps) ±5 EV (in 1/3 EV, 1/2 EV steps) Min. shutter speed 30 sec 30 sec Max. shutter speed 1/4000 sec 1/4000 sec Viewfinder Optical (pentamirror) Optical (pentamirror) White balance presets 6 6 Screen resolution 1,040,000 dots 1,040,000 dots Max. video resolution 1920x1080 (60p/30p/24p) 1920x1080 (60p/50p/30p/25p/24p) Storage types SD/SDHC/SDXC SD/SDHC/SDXC USB USB 2.0 (480 Mbit/sec) USB 2.0 (480 Mbit/sec) Battery LP-E17 lithium-ion battery LP-E17 lithium-ion battery Dimensions 131 x 99.9 x 76.2 mm 131 x 99.9 x 76.2 mm Choose cameras to comparePopular comparisons:
DiagonalDiagonal is calculated by the use of Pythagorean theorem: where w = sensor width and h = sensor height Canon 800D diagonalw = 22.30 mm h = 14.90 mm Diagonal = √ 22.30² + 14.90² = 26.82 mm Canon 77D diagonalw = 22.30 mm h = 14.90 mm Diagonal = √ 22.30² + 14.90² = 26.82 mm Surface areaSurface area is calculated by multiplying the width and the height of a sensor. 800D sensor areaWidth = 22.30 mm Height = 14.90 mm Surface area = 22.30 × 14.90 = 332.27 mm² 77D sensor areaWidth = 22.30 mm Height = 14.90 mm Surface area = 22.30 × 14.90 = 332.27 mm² Pixel pitchPixel 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 800D pixel pitchSensor width = 22.30 mm Sensor resolution width = 6026 pixels Pixel pitch = 22.30 × 1000 = 3.7 µm 6026 77D pixel pitchSensor width = 22.30 mm Sensor resolution width = 6026 pixels Pixel pitch = 22.30 × 1000 = 3.7 µm 6026 Pixel areaThe area of one pixel can be calculated by simply squaring the pixel pitch: Pixel area = pixel pitch² You could also divide sensor surface area with effective megapixels: Pixel area = sensor surface area in mm² effective megapixels 800D pixel areaPixel pitch = 3.7 µm Pixel area = 3.7² = 13.69 µm² 77D pixel areaPixel pitch = 3.7 µm Pixel area = 3.7² = 13.69 µm² Pixel densityPixel density can be calculated with the following formula: Pixel density = ( sensor resolution width in pixels )² / 1000000 sensor width in cm One could also use this formula: Pixel density = effective megapixels × 1000000 / 10000 sensor surface area in mm² 800D pixel densitySensor resolution width = 6026 pixels Sensor width = 2.23 cm Pixel density = (6026 / 2.23)² / 1000000 = 7.3 MP/cm² 77D pixel densitySensor resolution width = 6026 pixels Sensor width = 2.23 cm Pixel density = (6026 / 2.23)² / 1000000 = 7.3 MP/cm² Sensor resolutionSensor 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: (X × r) × X = effective megapixels × 1000000 → X = √ effective megapixels × 1000000 r 3. To get sensor resolution we then multiply X with the corresponding ratio: Resolution horizontal: X × r Resolution vertical: X 800D sensor resolutionSensor width = 22.30 mm Sensor height = 14.90 mm Effective megapixels = 24.20 r = 22.30/14.90 = 1.5 X = √ 24.20 × 1000000 = 4017 1.5 Resolution horizontal: X × r = 4017 × 1.5 = 6026 Resolution vertical: X = 4017 Sensor resolution = 6026 x 4017 77D sensor resolutionSensor width = 22.30 mm Sensor height = 14.90 mm Effective megapixels = 24.20 r = 22.30/14.90 = 1.5 X = √ 24.20 × 1000000 = 4017 1.5 Resolution horizontal: X × r = 4017 × 1.5 = 6026 Resolution vertical: X = 4017 Sensor resolution = 6026 x 4017 Crop factorCrop 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 800D crop factorSensor diagonal in mm = 26.82 mm Crop factor = 43.27 = 1.61 26.82 77D crop factorSensor diagonal in mm = 26.82 mm Crop factor = 43.27 = 1.61 26.82 35 mm equivalent apertureEquivalent aperture (in 135 film terms) is calculated by multiplying lens aperture with crop factor (a.k.a. focal length multiplier). 800D equivalent apertureAperture is a lens characteristic, so it's calculated only for fixed lens cameras. If you want to know the equivalent aperture for Canon 77D, take the aperture of the lens you're using and multiply it with crop factor. |
