![]() ![]() Thanks to the slightly better sensor noise figures the D300s has a slight edge here over the EOS 7D although the latter catches up at mid ISOs. ![]() Possibly more interesting than the naked noise and dynamic range figures is the tonality which gives you a better idea of the visual effect of both aspects. It is expressed on a logarithmic scale as the bit depth necessary to encode that number of gray levels: an increase of 1 bit of tonal range corresponds to doubling the number of distinguishable gray levels." (DxO Labs) The larger the tonal range, the better the image: noise is lower, and subtle nuances can be distinguished. The tonal range corresponds to an integration of the signal-to-noise ratio (SNR) over the dynamic range of the sensor, and is therefore representative of the average noise level. "Tonal range indicates how many gray levels are distinguishable up to noise in an image. If you move your mouse cursor over the chart you can switch between the figures for on-screen vs print quality. Here's an analysis by our partner, the ( DxO Lab): CANON 7D REVIEW NOISE ISOThat said ISO 1600 (screen quality) remains the meaningful limit with a little more potential for prints. It's obviously quite an achivement that Canon managed to keep a very good dynamic range despite the extreme pixel count or to be precise - the small size of the photodiodes. Interestingly the K-7 results fall apart at high ISOs here. The situation changes from ISO 400 onwards where the EOS 7D has an advantage of roughly 1/2 f-stops. Note that dynamic range is expressed on a logarithmic scale in EV (same as f-stop), thus an increase of 1EV corresponds to a doubling of dynamic range." (DxO Labs)Ī dynamic range (screen) of 11 f-stops ISO 100/200 is very good albeit a little worse compared to the Nikon D300s. The larger the dynamic range, the better, as the sensor is able to capture higher-contrast scenes. This range indicates the maximum contrast that can be effectively captured by the sensor. Of 9 Dynamic Range "Dynamic range or light sensitivity range of a sensor indicates the ratio of light exposure between the highest brightness a camera can capture (saturation) and the lowest brightness it can effectively capture (typically when noise becomes more important than signal, i.e., SNR < 0 dB). ![]()
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