They are curved.
Lenthamen,
if the Cirrus had a storm window I wouldn’t complain :-))
Actually for photography i use my old Warrior, which has a storm window AND a special photo window.
In 2009 I did a Coffeetable Photo book about Munich, I did all the pictures through the storm window of my Piper …. flying steep turns while looking through the camera …
Here:
Focus: No need for Autofocus when shooting landscape from the plane. I just use a fix setting, a short exposure time and f 11 whenever possible
No need for Autofocus when shooting landscape from the plane. I just use a fix setting, a short exposure time and f 11 whenever possible
The problem I find is that most/all modern lenses don’t have the infinity setting at the mechanical stop. It is usually about 1mm away. True; F11 will make that non-critical but F11 or so robs you of a lot of light. Normally I use F8. But whatever I do, I find the focus moves around as the camera is handled. I guess one could, for aerial shots, tape up the focus ring with insulating tape so it can’t move 
