https://chdk.wikia.com/wiki/Multiple_Cameras_using_CHDK it may be a useful starting point. My original thread is referenced on that page, I've checked all the references Give your relatively modest sync requirement, I'd lean toward an all PTP approach using chdkptp multicam.lua for triggering and downloading, but I'm probably biased because I wrote it. Sending commands frightens me quite a bit, will have to dig into itIt is theoretically possible to mix live view (for a single camera at a time) and multicam, but it's definitely not straightforward and would require some hacking. You might find the resolution insufficient for focus checking anyway. I think I'll forget about that option for now, maybe in the future...
Hi reyalp!First of all, sorry for reporting the topic, I realized it was in the wrong section and didn't know what to do.
Cameras are turned on manually.
Have each camera set up so CHDK saves files with a distinct filename (CAM01-001.dng) OK
Focus cameras by half pressing manually, check focus on display and have focus locked indefinitely so this step doesn't need to be repeated (we're assuming the subject won't move)
Measure exposure with handheld light meter, and set shooting parameters accordingly on cameras through PTP commands. This way exposure should be consistent on all cameras.
Remotely shoot a first frame with color-chart in RAW mode to have a proper color calibration reference. I'm not sure whether to do this with PTP or by turning on and off the USB hubs.
Shoot the required frames with subject in position (same as above, don't know USB or PTP?
And now, to make things worse... There's four other cameras, the main ones, which are Nikon Dslrs. Not really expecting to sync them with Canons, since that will require some very advanced hacking. My plan is to shoot them manually (with a remote trigger) and hope for the best sync... Subject should be stationary, so I'm not too worried about sync time, but any ideas to improve this will be very welcome.
The files are named correctly internally in the camera using a prefix.
My plan is to shoot them manually (with a remote trigger) and hope for the best sync... Subject should be stationary, so I'm not too worried about sync time, but any ideas to improve this will be very welcome.
And third would be to use flash, shut lights off, open all shutters...But I'm worried about the performance of SX150's in long shutter speeds, cause I see quite a lot of noise this way... Any info on this? Am I right to believe there's some important noise buildup with long shutter speeds?
I don't understand. CHDK names files like the canon firmware does e.g. CRW_1234.DNG. You can choose from a limited number of prefixes and extensions, and choose from 3 different directory options, but not anything like CAM01-001.dng
Your options are pretty limited if you've ruled both writing code and DIY electronics.The most basic I can think of is to physically link the switches together, so you can press both the Nikon remote and USB hub switch (or however you control the CHDK USB power) at the same time.
The noise issues vary a lot between models, so I'd suggest manually taking exposure of various lengths to see how bad it is on the ones you have.
Since I can't code nor build an Arduino controller, I believe these are the only options that can work. If you guys can think of any other methods I'll be very glad to hear them out. Thanks again
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