This suggests that the OP look at the SX60 or any of the recent G series, all of which have a hot shoe.A lot easier than modifying the flash electronics or tinkering with millisecond delays trying for flash sync.
SX60 is a digic 6 cam, so CHDK support may be a long way off. Same G16 and all the G*x cams except the original G1x.
I can't find the thread now, but I think several years ago I reported on a test setup to fire a manual remote flash from my A590is. I mounted a Seagull SYK3 optical slave trigger directly in front of the A590's flash, with a Cowboy Studio radio trigger transmitter mounted on the Seagull's hotshoe. And it worked. But that was only because the A590 let me set a manual flash level, which did away with the ETTL pre-flash, and because it had full manual exposure options, so I could take pictures which the camera thought were very underexposed.
As far as we know, all Canon P&S (both CCD and CMOS) use a mechanical shutter for still shooting. It's a lot simpler than a DSLR shutter, so lifetime should be quite good.
Quote from: corneliz on 14 / November / 2015, 16:40:14That the whole sensor is capturing at once. CMOS sensors capture line by line, so there is a delay between the top line and bottom line. This causes issues named the rolling shutter effects. And when having a very short flash duration, the flash is only visible at the lines which are read during the flash.Interesting! How long does it actually take to read out the entire CMOS sensor? Seems like it must be less that 10 uSec given the ability of CHDK to push most cameras up to at least a 1/10,000 shutter time.
That the whole sensor is capturing at once. CMOS sensors capture line by line, so there is a delay between the top line and bottom line. This causes issues named the rolling shutter effects. And when having a very short flash duration, the flash is only visible at the lines which are read during the flash.
QuoteA DSLR uses a mechanical shutter to avoid this. But that shutters have a lifetime of ~150.000. Some professional and expesive DSLR's go far beyond that.The Canon Powershots have mechanical shutters too AFAIK.
A DSLR uses a mechanical shutter to avoid this. But that shutters have a lifetime of ~150.000. Some professional and expesive DSLR's go far beyond that.
Well I just tested the Seagull SYK-3 with the A590's autofocus assist lamp, and it didn't work. Not enough light, I guess.Also, the Seagull devices don't have batteries. They get any needed power from the device they're triggering. Apparently that's good enough to fire the Cowboy Studio radio trigger, but the delay circuit in the SYK-5 would require ongoing power, and the CS trigger doesn't provide any. So that combination shouldn't work, although some other cheap trigger might.I don't think there's any good answer for this unless, as you suggested, WW, you build a circuit for it. But if he was willing to use the built-in flash as a trigger, and if the camera can be made to NOT pre-flash, then the Seagull SYK-3 and CS trigger combination will work on the A590, and probably other cameras. If A590s would be good enough (only 8mp), he could probably pick up used ones on Ebay for $40-50. The Seagull is about $7 on Ebay, and the CS trigger set is $21 on Amazon. So it wouldn't cost much to try them out. He would just need to build a rig of some kind to hold the camera and the trigger in the right place. And, you know, if the flash burns out, you just buy another camera. But I'm still using old Vivitar flashes from the mid-1980's, so I suspect the built-in flashes will last a long time.
Quote from: reyalp on 14 / November / 2015, 20:15:06This is only happen if readout occurs without the shutter being closed. For Canon P&S, this should only be true when recording video, or in case of mechanical failure, or extreme hardware modification.This suggests that the OP look at the SX60 or any of the recent G series, all of which have a hot shoe.A lot easier than modifying the flash electronics or tinkering with millisecond delays trying for flash sync.
This is only happen if readout occurs without the shutter being closed. For Canon P&S, this should only be true when recording video, or in case of mechanical failure, or extreme hardware modification.
I'm not sure that the SX60 or recent G series will fit my needs. I capture moving objects, I require shutter times of 1/1000 or a flash duration of 1/1000. Sorry, I haven't said that at first post. I'm not sure that a whole CMOS sensor is read-out in 1/1000 seconds. Only with a mechanical shutter I think... Because the read-out occurs after the shutter close.
Next is that I will reach 100,000 shots easily and go far beyond that. Replacing the camera every time is not an option.
In my case the environment is dark, so a the mechanical shutter could be left open. But how to do that is another question...
Are there numbers?
Ok... Is it possible to force electronic shutter via CHDK?
It seems that all camera's have a mechanical shutter. The CCD ones to shield the sensor from light while readout, it is not clear for my why that is.
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