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Rock Art mission Egypt


Hendrik H.

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Hi,

 

With the Royal Museums of Art and History, Brussels we are planning a survey in Egypt for Rock Art and we would like to use RTI. Until now, we have only used this technique indoor. It seems obvious we will use a heavy and as stable as possible tripod, but what would one advice as light source. The locations will be most definitely very remote, although we will be able to return to the mission house each night. As both sides of the Nile valley in the region of interest will be included in the survey, the conditions will be varying, and I guess we will need a quit strong light source to be successful. Another issue will be the size of the Rock Art panels. We need equipment which is easy to transport but nevertheless can manoeuvre the light source up and around 4 to 5 meters (who knows even more).

 

We have a few 1000 dollars at our disposal for the RTI registering, tripods and camera we obviously already have. Any suggestions?

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Is there a possibility of working at night?  For larger areas at remote locations, this could make it possible to use a less powerful and heavy light source.  It can also help to bring your shade with you (umbrellas, portable tents).  A good discussion on light sources is here.  Also, a portable dome (if it's opaque) can reduce ambient light for capturing RTIs of smaller areas.

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working at night will most probably not be an option (security  reasons). And yes, we have been thinking to use our dome, but unfortunately such devices have a limited recordable area, meaning a large amount of successive recordings have to be made of one and the same surface. These devices can also only be operated with an additional laptop (the lesser material in the field, the better). Thanks for the forwarding of a previous question on the topic

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We have had pretty good luck working in outdoor areas in daylight with rock art up to about 1.5 meters square at a time by using studio lights mounted on a monopod.  We have used the Einstein, which is dual voltage, so you can also plug it into power in a wide range of situations.  It is light enough to mount on a monopod and move around. The same company makes a portable rechargeable battery pack you can use with it in outdoor environments.  

 

You will need to block ambient light with neutral density filters.  This will require you to make your light brighter to properly expose the image with the neutral density filters in place.

 

The area you image must be in all sun or all shade - not partially in each.

 

Carla

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