User's Manual

Advanced Operations 43
© 2014 P romote Systems
ND: none
Shutter: SHORT->2"
ISO: LOW->800
- Add ND filters to -
- start ramp with -
It means the current sequence cannot be completed without using ND filters. Read below on how to use
ND filters.
ND filters
In many cases Promote Control will be unable to accommodate a bright daylight scene without using ND
filters. For these cases Promote Control provides a way to handle ND filters while doing bulb ramping
photography.
To let Promote Control you plan on using ND filters, change the default setting of "ND" above to anything
except "none". The following values are available:
"start" means you plan on starting with ND filters, and remove them when Promote Control asks you
to do so.
"end" means you plan on starting without ND filters, and add them when Promote Control asks you to
do so, ending the sequence with ND filters put on.
"keep" means you'd like to add them in the beginning, and keep them on during the complete image
sequence. This option is often preferred if you plan on leaving your camera rig unattended during the
bulb ramping image sequence.
If Promote Control calculation shows that ND filters are needed, it will suggest to either "start" or "end"
with ND filters. You may either follow the advice, or try the "keep" option instead. If you decide to "keep"
ND filters, Promote Control will try to use ISO ramping to correct for ND filter presence, doing all
necessary calculations automatically. If it succeeds, it will prompt to you proceed.
ND Filter Usage
When prompted to use an ND filter, use the following workflow:
1. Choose a setting for "ND" filter policy as advised by Promote Control ("start" or "end"). You may also
try using a setting of "keep".
2. Now you can specify up to two separate ND filters to be used. Enter one or more non-zero filter
values according to filters you have on hand. If a filter value is set to 0 (zero), that value will be not
be used and is equal to no filter at all. All non-zero filter values will be used simultaneously.
Read below to know more when Promote Control will apply those values.