|
“The seeing is terrible”
How many times have you heard?
“The seeing is terrible”
But is it the seeing or is it your telescope?
Attached are two images of an outdoor Ronchi test. It was a warm day and a cool night.
In the first image the mirror has been on the stand for about 3 Hours! (9.30pm)
In the second image the mirror has been on the stand for 7+ Hours! (after 1.30am)
An organic (Eyeball) look at the mirror shows a beautiful smooth figure with lots of diffraction fringes.
The bands do wobble with the heat but it is easy to see they indicate a lovely figure.
|