Jason OHara

I am setting up a three camera shoot, and need to match the images from all three cameras to inter-cut. I typically film with FX6, in CINE EI mode, and follow Alister Chapman's exposure advice using a grey card - exposed at IRE=41%: https://sonycine.com/articles/how-correctly-expose-s-log3---a7s-iii---fx3---fx6---fx9/ I understand the grey card should also be exposed at 41% for the A7S3 & A74 for Slog3, however I assume that when using CINE EI on the FX6, I am in essence "over exposing" by one stop (at CINE EI 400) or by two-stops (at CINE EI 200), and so presumably, I should be compensating for this on both the A7S3 & A74? And so if my understanding is correct (and if not, please correct me 🙂) what should the IRE value be when exposing the grey card on the A7S3/A74* to match the FX6 fiming in CINE EI at the FX6 base ISO 800? (*and locking the ISO to the base ISO=800 on A74, and base ISO=640 on A7S3). I read online that 1 stop corresponds to 10% IRE, so would I simply add 10% to 41% for every stop of desired "over-exposure" on the A7S3/A74, to match the impact of CINE EI on the FX6? i.e. grey card @ 51% on A7S3(iso640)/A74(iso800)? to match FX6’s grey card =41%, when filming CINE EI 400 (thus “over-exposing” the Slog3 on A7S3/A74 by 1 stop) grey card @ 61%on A7S3(iso640)/A74(iso800)? to match FX6’s grey card =41%, when filming CINE EI 200 (thus “over-exposing” the Slog3 on A7S3/A74 by 2 stops) I appreciate clarification on the above, and ANY other advice/tips regarding my intention to mix footage from these 3 cameras. Thank you!

I am filming a multi-day, 2-camera shoot - all in-studio interviews. In the past I have simply operated both cameras independently, and sync’d in post, however I am wanting to sync the cameras properly - so have both cameras share identical timecode, and also – ideally, have the shutters on both cameras opening and closing at precisely the same moment when recording each individual frame, so that each frame from each camera will be a true sync. It would also be helpful if the the B-camera could slave entirely to the A-camera, so pressing the record button on the A-camera triggered both cameras into recording, however this isn’t necessary as their will be a second camera operator. I’m also hoping to achieve the above by connecting the 2 cameras directly vs. using expensive peripherals or “sync” devices, if possible. I have never properly syn’d cameras before, so please forgive my ignorance. So far, I think I have gathered that timecode can be easily shared between the 2 cameras using a BNC cable. As far as having the shutters in sync, I *think* this requires Genlock? I don’t know what this is exactly, so am looking for confirmation as to how I achieve all of the above via Genlock, or through other methods. Please don’t feel the need to explain every detail to a newbie, simply outlining the basic method and pointing me to some more detailed information on YouTube or elsewhere would be much appreciated. Any other workflow advice for syncing these two cameras is also appreciated. Thanks in advance!

We are preparing for a 2-camera shoot in a studio, w/ a controlled 3-point lighting set-up (interviews), with 2 cameras on tripod, so no moving cameras, or changing light sources. Of course – we would prefer to use 2 of the same cameras, however we are still in development so cash-strapped and really need to make the most of the cameras we have access to (FX6 & C300mk2) , and so we are seeking workflow advice to optimize our set-up to ensure the images match visually and can be inter-cut. We will be sure to film a colour chart prior to rolling each camera, so that the colourist has this reference for matching the 2x cameras in post. We also intend to film flat/log on both cameras, so on the FX6: Slog3-S-Gamut3.Cine On C300mkii: Canon Log 2 (which I understand would be the preferable option to Canon Log 3, Canon Log 2 being flatter and more comparable to Slog3?) We much appreciate any advice relating to our intentions outlined above, and any other workflow advice for our set-up, given our intentions to inter-cut this footage. Thank you in advance! -J