Hi there Placei,
you could take a look at the discussion in this thread, you will find links to all the software I use to capture my images (the 2 programs I use are free too!!!).
http://air-source.us/phpBB2/viewtopic.php?t=3209
Basically you could download the FS Snapper program mentioned in this discussion and it will allow you to capture images from any of the default views used in Flight Sim.
If you want to get creative with the camera angles etc then there is a link to the other free program, but be warned its not the most straight forward program to use.
Just post back here if you have any queries and I will see if I can help you out,
Darren