A sunshade? Or loupe for outdoor viewing??

[JasonJosephNYC]

Hello !!
I'm curious if anyone has seen a sunshade or loupe for the ipad2
I'm a photographer and I need a device like this to enable me to preview shots while on location. I've searched around and found nothing. Wondering if perhaps I'm missing something.
Looking for something similar to the Hoodman Loupe.

 

[breausie]

I would be interested in knowing the same for using outdoors and on the bus.