Any Problems Taking A Portrait Photo When Device Is In Landscape?

I am making a rather specialist camera app for a device which is physically always going to be held in a landscape orientation. Part of the spec is that it must be able to preview

Solution 1:

I made a small camera test app a while ago. It was no problem, to show the camera preview in portrait mode, whilst the device was in landscape orientation. It was tricky to rotate the camera image by the right angle (because this rotation angle is device/camera dependant). A problem however was, that the perspective didn't match then: object seemed to be fatter or streched. But to find out the recalculating algorithm shouldn't take to much time on Stackoverflow.

So regarding

I just wanted to check here whether there was some fundamental problem that you think I might be up against.

[...]and physically this can not be achieved - or perhaps some other unavoidable issue.

the answer is: it's a doable task. Your exception probably has a totally different reason.