Hello, one should do photogrammetry on tripod probably for best results, but tripod isnt always available/one doesnt want to bother with in terrain/outdoors. But if you dont have "steady" hand, you can get yourself in trouble, you have to use quite high shutter speed to handheld it, also take into account you might not have a good lighting conditions to begin with - e.g. a cloudy day - perfect for photogrammetry - good ambient even lighting, BUT you might not get ENOUGH light for handhelf camera.
So... could one use a flash for photogrammetry? I have seen some round flash for DSLR that provided quite good even "cloudy day like" lighting (which you need for photogrammetry).
Did anybody tryed that? Did it work good? How much does the flash add lighting to the object you are scanning?
Also does anybody know the correct name of the "circular/round" flash that you place "around" your objective?