Actually Dave you don't disable the flash, you just reduce the flash power in the flash menu. To recap the flash must be raised, but by reducing the power level the onboard flash will not infuence the outcome.
The Nissin is pretty good, but at £184 you may as well buy the Canon @ around £200.
I have two Canon flashguns, two Sigma, but the ones I use almost exclusively are the YonguoYN 565 EX plus Yonguo flash triggers.
The only downside for the Yonguo is no High speed flash so you limited to 1/250 max shutter speed. Although my other flashguns have HSS it's extremely rare that I use High Speed Sync.
When I first read about these guns I thought at this price £105 +P&P I can't go wrong After two weeks I was so impressed I bought a second one Plus a pair of triggers. These I bought off Ebay from
http://www.ebay.co.uk/itm/YN-565-E-T...item35b696b3d6
Delivery took approx three days.
You can read a review here
http://www.diyphotographystuff.info/...-flash-review/
If you don't like Ebay you can buy them from Amazon for a few pounds more. Below is a watersplash photo taken using my two Yonguo flashguns.
Harry
