70D using Diffuser - Flash button press does nothing

[fr33zypop]

I have used my diffuser on my old XSI for years and when I went to try it on my new 70D the camera Flash seems to disable. When this is install in the hotshoe and I try to press the flash button, nothing happens. Soon as I remove it the button works. 

[cicopo]

Not sure I understand the situation but IF you install something into the hotshoe it presses down a switch to prevent the built in flash from popping up. If it tried to pop up there would be a problem because something SHOULD be in it's way.

[kvbarkley]

What is this thing called "Diffuser" is it something on the pop-up flash?  can you provide a link?

[fr33zypop]

This is the product - http://www.bestbuy.com/site/gary-fong-puffer-flash-diffuser/7451374.p?id=1218846430850&skuId=7451374...

[kvbarkley · Accepted solution]

I think Cicopo is right, the camera thinks there is something that will block the pop-up flash and keeps it retracted. You might be able to figure out where the switch is and modify the diffuser to not hit it.

[fr33zypop]

Thanks for your input. I'll give it a closer look at those contact points.