Confirmed: Sony a7 V is employing Dual Gain Output (DGO) to achieve outstanding dynamic range!
Reminder: Sony A7V finally available for preorder on Amazon (click here). “Arrives before Christmas” :)
The Sony A7V uses a new class leading sensor and it delivers stunning Dynamic Range at low ISO according to PhotonsToPhotos testing. We now have more details about how the camera achieves this:
As reported by Petapixel the Sony A7V uses Dual Gain Output (DGO) when using the mechanical shutter at base and low ISO settings. The good news is that the Sony does NOT use baked-in noise reduction with its RAW files. Petapixel writes:
A camera utilizing Dual Gain Output, DGO, captures two readouts of a single exposure with two different ISO settings. In the case of the S1 II, the camera at base ISO combines an image shot at ISO 100 and a second at ISO 800 and merges the results into a single RAW file. This means the camera can take advantage of the higher saturation capacity at low ISO and the improved deep shadow performance at a higher ISO.
The real limitation is that DGO does not work in electronic shutter mode which leads to about 1 stop dynamic range drop. Why?
DGO increases sensor readout times, which are not an issue when using a mechanical shutter but are problematic when using an electronic shutter, increasing the risk of rolling shutter problems.
I think Sony has found the perfect middle ground: outstanding dynamic range with the mechanical shutter (10 fps is more than enough for most users), and when you really need ultimate speed, you can push it up to 30 fps using the electronic shutter.
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Sony A7V preorders:
In USA at at BHphoto, Amazon, Adorama, Henrys.
In EU at Fotokoch, FotoErhardt, Calumet, Foto Köster, WexUK, Clifton, Park UK, Fnac FR.
In Australia at: Camera Pro, Sony Australia.
