It's well known that the Sony a7S III and its related cinema camera sibling, the FX3, are exceptional performers in terms of low light and capturing crisp images in the darkest of dimly-lit scenes. This is no surprise given these cameras have a maximum extended ISO of 409,600. However, one of the largest additional reasons the a7S III/FX3 performs as well as it does in low light is ultimately due to its not as widely publicized dual gain ISO.
This is not quite a "dual native" ISO, in that noise performance at this second ISO value is not as clean as it is at its base ISO. However, it provides two values (a base, and high value) with each gamma curve in the camera that noise performance and the image quality looks and performs at its best. Thus, enabling you to still get a great looking image even in extremely dark scenes.
I'll first discuss the two key things to look for when identifying the base ISO of any gamma curve in the camera (e.g. Cine4, HLG, S-Cinetone, S-Log3). Following this, I'll discuss the two methods you can utilize to identify the second, higher clean ISO value. It is worth noting that these ISO numbers will vary per gamma curve/picture profile used in the camera. Thus, it's more critical to remember the means by which you can find these, rather than to necessarily memorize any specific numbers, as these won't be universally applicable.
Let me know if technical tips and tricks with Sony mirrorless cameras like my a7S III are helpful, and I will try to make more!
Sony a7S III: [ Ссылка ]
0:00 - Intro, and why a dual gain ISO is useful/important
1:01 - The two ways to find the base ISO
1:30 - An important point about these dual ISO numbers...
1:55 - The first way to find the higher dual gain ISO (x20)
2:41 - The second way to find the higher dual gain ISO (+4.33 stops/13 steps)
3:44 - Conclusion
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My Current Kit:
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Cameras & Lenses:
Sony a7S III: [ Ссылка ]
Sony a7 IV: [ Ссылка ]
Sony a7 III: [ Ссылка ]
Sony 20mm f/1.8 G: [ Ссылка ]
Sony Zeiss Sonnar 55mm f/1.8: [ Ссылка ]
Sony 24-70 f/2.8 GM: [ Ссылка ]
Sony 70-200 f/2.8 GM: [ Ссылка ]
Audio:
Rode VideoMic NTG: [ Ссылка ]
Tascam DR-10L: [ Ссылка ]
Zoom H6: [ Ссылка ]
Lighting:
Aputure LS 60x: [ Ссылка ]
Aputure Amaran P60c: [ Ссылка ]
Aputure Amaran AL-F7: [ Ссылка ]
Aputure MC: [ Ссылка ]
Tripod/Monopod:
Manfrotto 290 Xtra 128RC: [ Ссылка ]
iFootage Cobra C180-II: [ Ссылка ]
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