Re: ATM Long focal length advice required please

["Bob May" <bobmay@nethere.com>]

I might note here that "homogenizing" the air is also good when you are
doing an optical test on a piece of glass during the winter now that the
heat is on in the house.  The use of fans to move the air around the room
will help immensly in the averaging of the air in the room and after a few
minutes of the fan blowing, you will see that, while there are still air
currents, they are of a very short wavelength and are moving very fast
across the image of the mirror.  After a bit longer, the ripples will soon
subside and you will be able to test, even while the heater is blowing!
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net