A detailed analysis of the dynamic range of Canon 7D camera evaluation

To the photographic enthusiasts to share the detailed analysis of the Canon 7D camera measurement dynamic range of methods.

Method Sharing:

"Dynamic Range" is the ability to reflect from the surface of the water to the shadow of the tree, the white dress of the high light to the tuxedo black, and so on, these high and low intensity of the camera to restore to what extent, it is the image of the overall level of the project. There will be a wide range of levels of EOS 7D to be tested with a standard board and a real shot.

Test method

Photography will be the difference between the exposure rate of 10 (according to 1/3 grade 30) of Black-and-white film grading standard plate. The lens uses the EF 50mm f/2.5 small macro. The width of the high light side and the shadow side is examined using the exposure standard (rgb=118) point near Gamma 2.2 as the benchmark. From the beginning of the high light overflow lattice to the dark part of the change disappears the first lattice is the dynamic range. The photo style is "standard (default setting)" and is tested with JPEG data.

Standard Plate Comparison

By taking the grading plate, the width of the high light side and the shadow side is examined, so as to examine its coping ability and the level reappearance characteristic of the target with high shading.

Alo: Disabling

High-light hue first: off

Alo: Standard

High-light hue first: off

Alo: Disabling

High-light tone priority: Start

In 3 cases where the Automatic brightness optimization (hereinafter referred to as ALO) and the highlight of the hierarchy can be significantly affected, and only one of them is opened, a comparison is made between the shots under ISO 200 sensitivity. When only the highlight-tone priority is started, the highlight-side range expands by 1 levels, gaining a very broad result of 8 and 2/3 levels. The average of the other 2 cases is 7 and 2/3. The Alo changes according to the image conditions, so the hierarchy characteristics on the board are unchanged.

Real beat comparison

Use Ef-s 17-55mm f/2.8 is USM, aperture priority automatic exposure (f8,1/125 seconds), ISO 200 shot. Open "Alo" and "high light tone first" for inspection.

Alo: Disabling

High-light hue first: off

In sunny sunshine, the reduction of high contrast is closer to the visual impression of the naked eye, with a sense of circumflex. The natural dark part and the high light portion of the appropriate high light overflow, it is felt enough dynamic range.

Alo: Standard

High-light hue first: off

No change in the highlight side, the shadow side of the restoration is slightly brighter, there is no dark part of the feeling of missing. The range does not widen, but the hierarchical characteristics change. The change from the middle to the dark part is more stable.

Alo: Disabling

High-light tone priority: Start

The reduction of the dark part did not change, but the sky that overflowed the high light was restored to blue. There is no change in the midtones, so there is no loss of circumflex feeling. Although this high light reduction is not necessarily necessary, it is indeed a powerful feature.

The dynamic range of Canon with ideal optimization value was found

In photo imaging, the light and shade of the subject are often far beyond the dynamic range of the camera, but it does not mean that the wider the dynamic range the better performance. There should be an optimization value that contains and outputs a media relationship. Canon's other models also unify dynamic range performance, which seems to be a strategy for determining optimization values.

However, as shown in the illustration above, there are two different functions that are used separately in conjunction with the shooting intent. And can use DPP for raw imaging, flexible use of the maximum dynamic range, the actual level of nearly 10 levels of reproduction. Institutions that do not need to pay special attention to failure to gain a sense of beauty, as well as institutions that are free to beautify images based on the intent to shoot, form a dual-body option. Because it enhances the sense of stability of exposure, the level of freedom of control can become a weapon to improve the degree of completion of the work.

Well, the above information is a small series of photography enthusiasts brought to the detailed Canon 7D camera evaluation of the dynamic range of methods to share all the content, you see the photography enthusiasts here, small knitting believe you now that is very clear assessment of the method of it, Then the friends are going to follow the small part of the method of the above to evaluate the Canon 7D camera dynamic range bar.