YS 25 Auto Coverage

I s there anybody who can tell me which angle the Sea & Sea Strobe YS 25 AUTO can make, can it succesfully cover the 16mm Converter from Sea & Sea?

I read that this flash will be delivered with a diffusor and from the NIKONOS I know that it work very well!

According to Sea&Sea site its covers 90º - 80º, I assume that with the diffuser.

I have it and with my Inon 105AD its work quit good, I can see that in the corners it not light very well a lot of times but for his price it's satisfy me.

On second reading my answer.

From what I wrote its seems that the YS25 is pretty good for WA, so Its not really, Its not bad for its price and its very useful for macro but for WA I'll proffered something stronger with wider angle of beam.

Any thoughts on the YS90 with a WA?

Steve