Mike I am using baffles out of an old achro scope see this thread
http://www.iceinspace.com.au/forum/s...ad.php?t=51351
It is important to accurately center them on the optic axis of the lens to stop any intensity gradients.
I am collecting data from a site at Eltham only 18km from Melbourne. Street lights and wasteful neighbours are my main enemies when the Moon is not around.
bert