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Old 16-11-2009, 03:59 PM
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erick (Eric)
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Join Date: Dec 2006
Location: Gerringong
Posts: 8,548
I was a bit confused. Yes, if you are talking about "DSLR Shutter", the software, it just does what the computer tells it, regardless of what the camera is doing! (This is for the simple control connections that I have on my Pentax K100D - a simple wired remote connection via a "stereo plus".)

Craig (DSLR Shutter) says:-

DSLR Shutter is really moronically simple. It sends "go" and "don't go" signals to simple parallel port data lines, the RTS/DTR lines of a serial port, or to the ShoeString DSUSB. The former two are very simple, binary signals. The ShoeString is “semi-intelligent" in that I need a software library from Shoestring and need to code up support for it. Doug's libraries are trivial to use and it's still sending very simple commands. It is still just sending "go" and "don't go" signals to this bulb port on the camera.

So you need to work out appropriate intervals to set in the software, to match what the camera is doing, as Roger says.

My K100D has a light which flickers as the image is written to the memory card, so I know when it has finished all its INCR stuff and processing and is yearning to open the shutter again.

So you can set an "after frame" delay or a "before frame" delay to allow the required time. As far as I can tell, it doesn't matter which you choose.

As far as I can tell, my camera takes a dark exposure for the same time interval as the "light" exposure, then spends another second or two processing and writing the resulting image to the card.

I'm going to try to capture the Leonids on Wed morning with DSLR Shutter driving the camera, but with INCR off. So have to work out the timings tonight in the comfort of my lounge room!
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