Interesting thread, this.
I fly an Extra 300 civvy advanced aeros aircraft these days.
These are fitted with a comparatively large (tandem 2 seat) canopy.
In my experience they have minimal optical defects and this from soloing in the rear seat.
The downside is that for every 6 canopies produced, 4-5 are scrapped for optical distortion. This gives a price tag for a replacement of around £10,000 !
Last edited by Sleeve Wing; 18th May 2012 at 21:00.