yeah. just basically multiply by a little over 3.
1meter is 3 ft 3.5 inches or so.
The flashes are a great tool. relatively inexpensive and will work with any lens.
430ex2 = $270 new
better beamer = $40 new
for LESS than a cheap telephoto you have a tool you can use many ways.
I hope you're right about it being simple 'cause I just looked at the beginner's guide to flash posted in another section and all the formulas, multiplications, square roots, etc. etc. WHOA! But I think I am going to work towards that above combination.