Full-frame top level Sony A7M3 latitude performance evaluation

IT168 evaluates the tolerance performance of a camera, which is reflected in the error tolerance rate for user exposure errors. With today's digital cameras, even if the photographer makes a mistake in the early stage (the photo is underexposed or overexposed), the final photo can be adjusted to the correct exposure by brightening or darkening in the later stage. The camera with better latitude has a wider acceptable range for underexposure or overexposure.

At the same time, the dynamic range performance of a camera is usually positively related to its latitude performance. Cameras with better latitude generally have greater dynamic range. It has strong guidance for us to judge the performance of a camera in landscape photography.

As a newly released full-frame mirrorless camera, the performance of Sony A7M3 in terms of tolerance must be the focus of everyone's attention. Next, we will take a look at the strength of Sony A7M3 through real shooting tests.

We still use the standard scene in the IT168 evaluation room to test the camera’s tolerance. The camera is placed on a tripod, ISO100, aperture F8, fixed white balance, turn off all in-camera noise reduction optimization, and use lossless RAW format. Manual exposure was taken with 2 stops of underexposure, 1 stop of underexposure, normal exposure, 1 stop of overexposure, and 2 stops of overexposure. Later, the exposure was adjusted to normal through Sony's official EDIT application. Take a screenshot of the upper right corner of the scene as follows.

▲The intercepted area is shown in the red box in the picture above

▲Sony A7M3 was underexposed by 2 stops. After adjusting back to normal exposure, the slice was 100% enlarged

▲Sony A7M3 Underexposed by 1 stop, adjusted back to normal exposure and 100% magnified slices

▲Sony A7M3 under normal exposure, 100% zoomed in slices

▲Sony A7M3 overexposed 1 stop, adjusted back 100% enlarged slices after normal exposure

▲Sony A7M3 was overexposed by 2 stops, adjusted back to normal exposure and 100% enlarged slices

From the results, Sony A7M3 was underexposed by 2 stops , underexposed by 1 stop and overexposed by 1 stop, you can adjust back to normal exposure almost losslessly through post-processing. Whether it is the details or color performance of the picture, there is no obvious difference compared with the photos with normal exposure. If I have to be critical, there is some noise in the dark areas when underexposed by 2 stops, which is a bit of a pity.

When the photo is overexposed by 2 stops, the color of the adjusted picture cannot be lossless. But objectively speaking, the degree of loss is acceptable. And judging from the actual look and feel of the picture, the character on the right side of the picture does not seem to be greatly affected, and the photo is still highly usable.

To summarize, judging from the actual measurement results, the tolerance performance of Sony A7M3 should be at the top level among current 135 full-frame cameras. For novices, even if they make mistakes in the early stage of using the A7M3, they can recover the correct exposure through non-destructive adjustments later; for experts, the A7M3's tolerance performance should also have enough room for them. Play in landscape photography.