Quote:
Originally Posted by asimov
Yes sorry, mirror lockup is what I meant. So it doesn't do it? That's a bugger!  |
Well, maybe yes in some cases.
When camera is in mirror lock mode,
- the first pulse from timer triggers the mirror
- the second pulse triggers the shutter.
That means, when you have a camera in mirror lock mode, you have to program the timer to 2x number of exposures...
The good news is, mirror lock is not really needed at long exposures (low-light conditions), those couple of tens of miliseconds while the whole assembly is shaking will have very minimal impact on image, if any.
However, when you have a lot of light (Moon, daylight photography) 1 milisecond of camera-optics vibration could be detrimental to the end result.
So if you are taking sequence of frames, say every couple of seconds or so, you can simply program your timer for double the number of frames (with appropriate delay between them) and that's it.
If you need to take frames with very long delay between them (minutes, hours..), then I guess this method will not be practical.. it will still work, but I think the battery may not last that long (I think camera draws substantial current when mirror is locked - wil test this at some time.. having in mind the coming Moon eclipse :-) )
You can still use some programs to do that (If I remember correctly, Shoestring Astronomy used to have application that does mirror lock, with programmable delay). For this to work you have to have a custom build cable - it is not hard to make it.