- Moderator
- #401
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- Apr 19, 2007
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I've more or less been trying to push the industry in a direction that the "general recommended Base ISO" is where you have approximate even stops above and below an exposed 18% Gray. This sets the filmmaker ideally up for success and typically is a really good starting point for exposure method/logic within a camera system to help you produce a nice cinematic image. RED, Jarred, and Graeme all have reiterated that sort of notion for the most part. I view this as a starting point to get to know and work from there. Interestingly you might have a stop or two variance in there up or down depending on the manufacturer and what will be described as a "universally pleasing image" in terms of reasonable noise levels at a given capture resolution towards a desired finishing resolution.
RED's been fun because you'll see them recommend ISO 800 moderately universally at this point despite all the different sensor technologies and unique Dual ISO sensors. More or less trying to unify things in my mind. Oddly I see productions rocking Monstro at ISO 1600 at 5K even just to get that flavor of image, and truthfully that's what it's all about. These are tools for you to discover how they best suit your project, like all the cameras out there.
Outside of that we have access to various OLPFs, which are more accurately Color Science Filters now that the Anti-Aliasing aspect of the filter has been move to the sensor's cover glass. These block, reflect, or absorbed the evils found with IR and UV light at different levels. Some basically are more light lossy than others, my general logic is use the Low Light Optimized and Standard around the same ISO rating, cut the ISO in half for the Skin Tone Highlight and you'll be pretty safe. Some sensor's native color temp play better with each OLPF, but this rule of thumb is something that you should certainly keep in mind. i.e. If you like say Helium at ISO 800, with the Standard OLPF, go with ISO 400 with the Skin Tone Highlight OLPF, the Low Light is fairly close to Standard, but maybe give a 1/3rd or 2/3 stop improvement. Then again you might like working at ISO 2000, so build from wherever.
Industry-wise we got into a fuzzy space of the term "Native ISO", which nobody actually wants to know because it's usually measured in linear light and is a number that is very low and not exactly how we use the footage to create a normal looking image, outside of VFX and a few nosey Colorists and DPs that is
Certainly reasons to dig deep though for those who need to get in there with various post workflows.
RED's been fun because you'll see them recommend ISO 800 moderately universally at this point despite all the different sensor technologies and unique Dual ISO sensors. More or less trying to unify things in my mind. Oddly I see productions rocking Monstro at ISO 1600 at 5K even just to get that flavor of image, and truthfully that's what it's all about. These are tools for you to discover how they best suit your project, like all the cameras out there.
Outside of that we have access to various OLPFs, which are more accurately Color Science Filters now that the Anti-Aliasing aspect of the filter has been move to the sensor's cover glass. These block, reflect, or absorbed the evils found with IR and UV light at different levels. Some basically are more light lossy than others, my general logic is use the Low Light Optimized and Standard around the same ISO rating, cut the ISO in half for the Skin Tone Highlight and you'll be pretty safe. Some sensor's native color temp play better with each OLPF, but this rule of thumb is something that you should certainly keep in mind. i.e. If you like say Helium at ISO 800, with the Standard OLPF, go with ISO 400 with the Skin Tone Highlight OLPF, the Low Light is fairly close to Standard, but maybe give a 1/3rd or 2/3 stop improvement. Then again you might like working at ISO 2000, so build from wherever.
Industry-wise we got into a fuzzy space of the term "Native ISO", which nobody actually wants to know because it's usually measured in linear light and is a number that is very low and not exactly how we use the footage to create a normal looking image, outside of VFX and a few nosey Colorists and DPs that is