Philip Bloom Tests Sony A7S III “Dual ISO”

Sony A7S III Dual ISO

Sony Venice Cinema cameras offer Dual ISO and while Sony officially states that Sony a7S III does not have dual ISOs, there is a point 4-stops above the base ISO where a7S III boosts the signal to the analog digital converter resulting in lower noise. This effectively creates a second base ISO.

Philip Bloom put Sony A7S III Dual Base ISO to the test and found they vary depending upon the picture profile selected. Here’s what he found:

S-Log 2 / S-Log 3

Low Base ISO 640 / High Base ISO 12,800

HLG

Low Base ISO 100 / High Base ISO 2000

Cine 2

Low Base ISO 50 / High Base ISO 1000

No Picture Profile

Low Base ISO 80 / High Base ISO 1600

In other words, when shooting still with no picture profile you’ll get less noise at ISO 1600 than you would at ISO 1280 and the same is true in cine profiles meaning S-Log 3 has less at ISO 12,800 than at 10,000.

Because base ISO depends on the picture profile the ISOs will vary depending upon profile selected – but they are always 4-stops apart.

Bloom exaggerates noise by pushing up shadow detail in this video to show the point where noise drops:

Order Sony a7S III Camera from B&H Photo | Amazon | Adorama

Apply for B&H Photo Payboo Card

Sony Announces FX30 4K Super 35 Cinema Line Camera for Future Filmmakers

Sony FX30 ($1,798) leverages the power of a newly-developed 26MP APS-C Exmor R CMOS sensor to provide content creators and aspiring filmmakers with a powerful,

Read More »

Today Only! Save $200 on Gitzo Series 1 Carbon Fiber Traveler Tripod for Sony

Save $200 Today on Gitzo Series 1 Carbon Fiber Traveler Tripod designed for Sony a1, a7 and a9 series cameras. Gitzo GK1545TA Series 1 Traveler

Read More »
Sony-A1-Firmware-1-31

Sony Releases a1 & a7S III Firmware Updates

Alpha 1 Firmware 1.31 Sony releases Alpha 1 Firmware Update 1.31 which improves accuracy of Eye AF and improves overall stability. Applicable Model: This information

Read More »

Leave a Comment

Your email address will not be published.