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I would generally use an HMI outside during the day. I don’t remember blacking out the back window but I may have cut some of the light from that direction with a sold set away from the window. I also remember that the sun came out while we were shooting some tight shots so I had the car surrounded with solids.
I can’t imagine a 2K being effective. It also seems you might need to control the natural light so that it does not overwhelm any source you use. I would expect to use an Arri Max for this kind of effect or, at least a powerful HMI Par.
If the fire on the characters is animate does it need more than a little interactive firelight hitting the areas on which they are sitting? I would suggest the main issue will be the flicker of the firelight and syncing that between what light is in camera and the 2D animation.
I think there is some confusion between fall-off and the size of a light source. They are not connected. The fall-off of light from a source follows the inverse square law. How soft that light is on the subject is governed by the size of the source relative to that subject. That is simple geometry.
I suspect that the bounce was warming the HMI a little, so I doubt I used any CTO gel. Had there been a warm practical in the kitchen I might have warmed the lamp and shot without an 85 or EF filter on the camera.
I have only done some limited day for night shooting and that was in a forest in Kenya. I did use some artificial lighting to pull the character away from the background but I wouldn’t say it necessary I think that depends on whether it is sunny or cloudy or if the foliage is particularly dense.
There was a bounce source in front of the car to add a little more contrast to the natural light. Yes, the scene changes from rain to snow and this was achieved by our effects team, in camera, using cranes, rain bars and ‘snow’ blowers. We wanted some flexibility in scheduling these shooting days because we needed, at the very least, cloud cover. The problem was the road closure, which allowed us only two specific weekends to work over. We got lucky in that it rained on our first day and remained cloudy through the next morning.
I remember the room was small and I didn’t use anything inside. There was a small window to the right so I probably had a 6K HMI and bounce source outside.
You could just use white card. You could cut out a circle of any size, preferable cheating it larger than the moon’s reflection really would be.
Some post stabilization was used on the last film I shot but I don’t remember any being needed on ‘1917’. It is a good tool and can help a tracking shot that has a bump in it.
I probably used a 32 and 40mm for most of the film but there were plenty of shots made with wider lenses and with a purpose made set.
