Hello,

Quick question, what would be your choice if you would like to buy a o-ring/ring-flash that fit canon 5d II?
Must have good power if LED and low weigh if mount on the head of the flash.

Please give me an 2 examples.

Thanks

Leds dont have much power in them, so unless you are getting it for macro, dont intent of using it with studio flashes and have a regular flash, i would suggest:

http://www.bhphotovideo.com/c/product/1023900-REG/expoimaging_rfu_l_ray_flash_universal_ring.html

http://www.bhphotovideo.com/c/product/627715-REG/Orbis_ENLORB1A_Orbis_Ring_Flash_Diffusing.html/prm/alsVwDtl

Dunno if orbis is worth the extra money and maybe there are some cheaper alternatives around, im sure its easy googled.