dennishh
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 A7RII 12-bit mode. How to avoid it. | |
Great discussion! All of these tips should be consolidated into one sticky called \"optimizing A7 performance\" Another area of complete misunderstanding about the camera is battery performance. Almost every podcast I listen to talks about the miserable battery performance of the A7 mostly by people who don\'t even own one. I just spent a week in Rome shooting every day from dawn to dusk only using two batteries at the most. My recommendation to most newcomers to the camera are,
1. Turn off auto review.
2 Turn off the LCD
3, Turn the camera off between series of shots.
There\'s probably more that I don\'t even use.
I know that the battery performance could be better but for me it\'s not an issue. Hopefully the many advances in battery technology will find their way into Sony batteries soon.
Fred Miranda wrote:
Continuing our discussing on this subject that started here.
It\'s documented on the Sony\'s A7RII Help guide that resolution is limited to 12 bits when using the following shooting modes:
*My commentary below the modes.
- Silent Shooting
*I would turn this mode OFF for critical work
- Long Exposure NR (when the camera automatically captures a black frame after the exposure)
*I would turn this mode OFF and capture a black frame instead
- Bulb (more than 30 sec. exposure)
*There is no way around this one. Once you pass 30 seconds your files will gain 1-stop more noise and 1-stop less dynamic rage. If you are doing Nightcapes and need ISO 400 or higher, the noise increase from the bits reduction will be less noticeable according to the article below.
- Continuous Shooting. (Including Bracketing continuous shooting)
*When using Bracketing, do not set the camera to continuous shooting
Jim Kasson put this to test with the A7II and was able to verity something that we had suspected from the initial A7RII online samples. 12 bits will make your shadows worse by about 1 stop and the image will also lose about 1-stop of dynamic range. It\'s very noticeable when recovering shadows in post-processing.
Here is an excerpt from the article:
\"When the shutter is not set to bulb, and the shutter mode is set to continuous drive, speed-continuous drive, continuous bracketing, A7s’s silent shutter, and any possible combination of these, the linear, pre-tone-curve, bit depth of the camera is 12 bits. With all other settings, including single bracketing, the linear bit depth is 13 bits.
The loss of precision associated with the affected shutter modes causes an increase in the read noise by about one stop, a decrease in the dynamic range by about a stop, and more shadow noise, as can be seen in this photon transfer curve of the a7II’s performance in the two modes.\"
Read Full Article
For landscape photography the only real issue will be Bulb mode as other modes can be avoided. The good news is that the loss of precision associated with the Bulb shutter mode can only be really noticed at base ISO. The higher the ISO setting the less noticeable this side-effect will be since there is little analog read noise to dither the ADC signal.
Your thoughts?
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