I cant help with your mounting issue, but how do you plan to get the image from the camera onto the tablet?
It sucks that there arent any cheap tablets etc with an HDMI input, would be such a perfect solution to having a decent sized live view monitor without breaking the bank.
It sucks that there arent any cheap tablets etc with an HDMI input, would be such a perfect solution to having a decent sized live view monitor without breaking the bank.