ISO is about sensitivity. Useful to know when using a lightmeter – e.g. the iPhone’s “Light Meter” app, where if you enter ISO it tells you the required aperture f-stop. For the EX3 the ISO depends on several factors, such as Gain, Gamma, Recording Mode (definition and interlaced/progressive). But a reasonable rough conservative working figure is 400. More specifically:
- 400 for 1080p
- 500 for 720p
- 800 for 1080i
- (some say this surprising result derives from the interlaced lines each being derived from the sum of a pair of neighbouring lines)
Links:
- www.dvxuser.com/V6/archive/index.php/t-217123.html
- Gives the above ISO figures for the different recording modes.
- I verified that at least the relative order was correct, based on %IRE in the on-camera LCD monitor.
- Gives the above ISO figures for the different recording modes.