M57 ring nebula widefield

Mount: HEq5pro
Camera: Canon 450D unmod.
Lens:Nikkor 300mm ED
Focal ratio:5.6
Exposure time: 1.3 hours
Software: Iris5.57 - Photoshop CS
Guiding system:SW600mm Meade DSIcolor PHD
Date:7-6-2010
Lazarus observatory
Larissa-Greece