...in case anybody still cares about this thread...
OK, i came home this evening to find my package from China on the porch, MUCH quicker than i expected. On initial inspection, the device is gigantic and made of fairly breakable plastic. It looks like it could become broken in my camera bag if i am not careful. Anyhow, the 175mm model is the one i got for use with my K10D and AF540FGZ flash, and the fit is perfect. it mounts securely with the attached velcro loop and the flash ring portion clears the lens just fine with room to spare.
One annoying thing is that the added weight of the O-flash will cause my flash head to swivel forward or to the side when i tilt the camera; anybody know how to tighten down the flash head??
here's an in-the-dark mirror shot showing how the light passes through the internal reflectors:
No time to set up a proper test, I used my wife's running shoe for the first comparison.
This is the Pentax AF540 flash (TTL mode) WITHOUT O-Flash:
(definite hot spot on top and shadows on bottom)
...and here it is WITH O-Flash(TTL-mode):
...much more even light dispersion.
I think for the price, this is a fine deal and at first blush appears to do what it claims. now i can go out and shoot some bugs!
Last edited by mikeSF; 02-16-2011 at 09:03 AM.