Hello friends,

I am new to photography, I own a 5700 and may be planning to buy a D70 or something similar in the future. Want to invest in buying a flash product which can work with my current 5700 and also work with the D70 atleast. Can someone advise on what will be the best model to buy, which will protect my investment even when I go to a D70.

Also i really dont understand what are the terms D-TTL, i-TTL and non TTL used for Flash usage with Camera. Appreciate if someone can help me with this explanation or forward me to some websites/documents that would explain the terms.

Thanks In Advance for the information