I have checked out manuals for YN-500EX and Apertile 700 flash. I am able fire in wireless mode by putting them into ETTL slave C mode. I set wireless setting on camera to remote flash only instead of mixing with pop up flash. In order to use both of them, I think I have to make one flash as group A and another flash as group B. Then select all the groups (AB) or A+B option. Is AB, A+B and A:B with 1:1 ration, are ending up producing same output.
My idea is, to use both the flashes in order to have lot of flash power to shoot at F8, 1/160 and low ISO (100 or 200). It gives me room to adjust later in case I screw up flash exposure. I am also planning to take group pics of lot of people.
Are these flashes going to work inside indoor basketball stadium or gymnasium with very high ceilings. Do I have enough power to bounce off flash from ceiling.
Canon 70D, Sigma 17-50mm 2.8 os, 10-18mm is stm, 55-250 is stm and 85mm 1.8.