If all you want is to replace pop-up flash the 90 EX should work fine. White Box at B-H is $60 if still available. 270 EX is more flexible as stated above and has 3x the power if you don't need a master function. Both fit in a pocket - obviously larger pocket for 270EX. BTW: was I the last person on earth to find out that you get the guide number in meters by dropping a zero from the model number of all current Canon flashes? I.E. 90EX is guide number 9 in meters, 270EX is G.N. 27, 600EX-RT is 60, etc.That's awesome information... though going from a 580 exii to a 600 rt... I thinking... is that extra 6/7 feet really going to make the difference?
I've used both 90 and 270, 90 makes a nice master on 5D-II with 430 slaves. Catch light at 20 meters? Really?
No, well maybe but only if you are using a 200mm lens with the flash on camera, the flash output is the same as the 580, same as the 550 too. It only gets a higher guide number because of the artificial way they measure it, the 600 zooms to 200mm.
« Last Edit: May 04, 2014, 01:58:38 AM by privatebydesign »
Too often we lose sight of the fact that photography is about capturing light, if we have the ability to take control of that light then we grow exponentially as photographers. More often than not the image is not about lens speed, sensor size, DR, MP's or AF, it is about the light.