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For most
of my indoor testing I have used the comparative Ronchi test. This is
explained here.
The reference ronghigrams were produced with ronwin. In the figure below
the top row are the reference images and second the fist test I did when
I received the mirror back from figuring. From this it looks like the
mirror is horribly under-corrected. The real explanation I think is that
the mirror was being tested near a window and wasn't able to thermally
equilibrate. The bottom set of images is from the mirror place away from
drafts! This looks pretty good. The difference between the 2 tests
really brings home the necessity of allowing mirrors to cool freely.
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The Poor Meadow Dyke Galleries are now open. THE
GALLERIES |
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See the full range of Atik cooled CCD cameras for
astronomy on the Atik Website
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