GigaPan EPIC Pro User Manual page 71

about 1/10 of a second. If you are photographing during
the day and want to use the BULB mode, then you will need
to use a good quality neutral density filter.
Frequently Asked Questions
1. What changes exposure and why should I only vary
the shutter speed?
When you capture multiple exposure brackets for each
position for the purpose of capturing HDR images, you vary
the exposure by varying the shutter speed and keeping the
ISO, and aperture constant. Do not vary the aperture
because it will change the depth of field.
2. What does EV (exposure value) mean?
An increase of one full exposure value means that you
double the amount of light. You can do this by doubling the
shutter speed from one second to two seconds. A decrease
of one full exposure value means that you decrease the
amount of light by one half. One full exposure value less
than one second is one half second.
(*see note below regarding quotations)