Jance Allen

Very interesting. If this test is successful I'm sure I'll be following up on your idea. Thanks!

We're shooting motion control at 72fps, and we basically need the light to be fully on within one frame. The camera is moving so we can't edit out the ramp-up frames. But the basic gist of the effect requires the light(s) to be fully off up to a certain timing point, and then instantly fully on at the next frame, with no lighting ramp-up time. Sounds like we need to see if we can find some LED panels. We're in Seattle so I'm not sure what's available. And it's of course last-minute, as we're shooting on Sunday. We're not screwed without it, and this is just a test shoot, but it would be cool to test this effect while we're at it. Thanks for all the replies!

Thanks! Looks like Lightning Strikes became www.luminyscorp.com. I'll contact them and see what their options are. A couple of people I've asked have also wondered if LEDs light up fast enough. Might have to just try.

Is there a type of light that gets to full brightness instantaneously (or nearly so)? Not a flash, but a light that when switched on won't take multiple frames to light up at 72fps. Thanks for any help!

Oh, I did find the operations manual here: http://pro.sony.com/bbsccms/ext/cinealta/d...00_opmanual.pdf But it didn't really help me in this case.

Hey, does anyone know the best settings for the sony hdc1500 for greenscreen? I generally say "turn off detail enhancement, turn off sharpening, etc." There are a lot of menu options with this camera - some go from +100 to -100, some have "off" and I'm just wondering if there's a sweet spot that any of y'all have gotten dialed in. Thanks for any info!

Hi, thanks for the responses; I've been away from this list for a bit. Per the color fringing, that example image I posted was indeed from the upper left of the frame. The laptop was sideways inside a gimbal room that rotated. Unfortunately I'm not that much of a camera or on-set guy; I'm coming from the post side and being asked to help diagnose visual artifacts after the fact. (Currently dealing with bad vertical banding from a Phantom camera... grrrr). I'm personally just pushing for our shoots to have someone look at frames under a microscope as soon as possible, on-set. Correct me if I'm wrong, but that particular noise pattern wouldn't really show up on a scope, or at least not as clearly as looking at separate channels at 100% zoom. I mean, the first thing I do as a compositor is zoom in and look at R, G, and B separately, and usually my reaction is "oh poop." I'm really looking forward to some of the new cameras and new workflows. I won't go so far as to say film is dead, but I personally would be glad for tape to die. - Jance

Thanks for all the information. I'm much more of a post guy than a camera guy so a lot of this is unfamiliar to me. Do any of you recognize that particular horizontal line noise that's in our footage? I don't know if you've been able to download that cropped clip and look at it, but that noise is pretty blatant and is just a strange pattern in my opinion. We're having to roto some otherwise-well-shot bluescreens because of noisy jaggy edges. I don't know if it's appropriate to ask about other cameras in this forum, but we're trying to learn from this footage so we know what to plan for in future shoots. If you got footage back like that, would you say "yeah, looks about right for the F900" or would you investigate the problem? lens? setup? chips? enhancement? tape deck? Thanks again.

Thanks for the replies. I'm going to see if our contact at Panavision has any thoughts. We're moving ahead with the footage, but I just want to learn what I can from this for future shoots.

Just as a followup, we pulled in frames at another transfer facility and we're seeing the same artifacts off their deck. So I think our ingest pipeline is good. I'm still wondering about those horizontal lines and the overall noise, and if that's normal for an F900. The DIT said they shot at -3db. You can also see color fringing; I've seen that before with HD footage, so it's not a huge surprise. I'm just hoping some F900 veterans can weigh in about whether there may have been some problem with this particular camera/sensor. Thanks!

Hi, Sony pros - We're wondering if the noise we're seeing in our F900 footage is normal. It was brought into our Avid at 1:1 and exported as uncompressed tiff sequences. There are some interesting horizontal lines (especially obvious in the blue channel) and more noise in general than the vfx supe saw on the monitor on-set. Just wondering if anyone can take a look and give me your opinions. I uploaded a 20MB uncompressed Quicktime example here (a small crop of the 1920x1080 at 100% scale): http://www.limbotext.com/temp/HDNoiseExample.mov Let me know if that looks fine to you, or if we need to investigate. I can't show any of the actors footage, but it's very present in the mid-tones. Is there any step in the Avid ingest that could be contributing? Thanks for any help!