Tips, Tricks and Frequently Asked Questions
Published on Elysia Visuals (http://www.elysiavisuals.com)
Does it take long to analyze the images?
Your interval needs to be long enough during histogram mode. The reason for this is that it takes
some time before an image is ready for analysis. Let's say that we have a shutterspeed of 2 seconds
and that it takes 3 seconds before the image is written to the memory card. In this case it takes 5
seconds after the start of the shot before the RamperPro can download and analyze the image.
Downloading and analyzing a 36MP jpeg from a D800 (in basic quality) only takes 2.5 seconds. This
means that in this example it takes at least 7.5 seconds from the beginning of the shot until the
analysis data is available. The bulk of this time is due to the nature of how digital camera's work.
This long interval can be limiting is some cases. We recommend to disable histogram mode if you
need a shorter interval. Just make sure to set the proper end exposure in this case. You could
determine this end exposure by doing a test shoot if you are able to do this. You can then determine
the proper end ISO and shutter speed that you need to set when you are not using histogram mode.
Set the correct aperture on Canon cameras
Popular Canon camera’s like the 5Dmkii and 5Dmkiii feature a dial that you need to physically turn
to choose manual or bulb mode. It can happen that the selected aperture differs between manual
and bulb mode. Please make sure that you set the same aperture in both the manual and bulb mode
of your camera before you start. Failure to do so will result in different exposures when you switch
from normal shutter speeds to bulb mode.
Properly setup your Canon dSLR
Make sure to set ‘External Speedlite control’ to “Enable”. You also need to make sure that the ISO
and shutterspeed steps are in 1/3 stop increments (and not in 1 stop increments). These are the
default values of your camera, so you are fine if you have never changed them on your camera.
How does the intervalometer work
The intervalometer of the RamperPro determines when its time to take the next image. There are a
few things that might be interesting to know about this. The intervalometer always starts counting
again as soon as the interval has expired. This means that the interval will start counting as soon as
a picture is taken. Let's say that we have set an interval of 8 seconds and a shutter speed of 5
seconds. A result of these setting is that the next image is taken 3 seconds after the exposure is
finished of the previous image.
It can happen that you have a situation where the shutter speed is larger than the interval. The
RamperPro will not stop when this is happening. In fact, the exposure ramper will still give good
results because all calculations will take this into account. The only effect will be that the interval will
be longer than expected because it will now become at least as long as the shutter speed that is
used. The error detecting system of the RamperPro will try, where possible, to warn upfront that
there is a possible collision between the interval and the shutter speed.
Which shutter speeds are calculated by the RamperPro
There is a shift in the shutter speeds that are used by the RamperPro. That is by design. This is
because, by default, the RamperPro will always make negative XMP corrections. So, suppose you
want a start shutter speed of 1/100. You will get 1/80 and a correction of -0.3 at the beginning of
your shoot.
The camera is not taking any pictures
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