[alpal]

Originally Posted by John K

What about hubble optics in Hong Kong? They seem to be producing some great optics of fused mirrors at the moment?

Thanks John,
It seems like it's all there:

http://www.hubbleoptics.com/mirrors.html

And it says:

The main problem is not the aberrations due to deformation, but the
layer of warm air in front of the primary mirror. This layer of warm air is
the main cause of the image distortion called "mirror seeing", which is
caused by the non-uniform index of diffraction in the cooler air over the
warm mirror surface. No mirror, regardless of the type of glass used,
will perform adequately until the mirror is close to the temperature of
the ambient air. This occurs when the temperature difference between
glass and air is less than one degree centigrade (°C), and best
performance is achieved when this difference is less than 0.2 °C.

They also have protected silver coatings - interesting.
I am not sure if they have 10" size.
They don't state the weight.
I'll write to them.


cheers
Allan