Archived from: http://bhs.broo.k12.wv.us/homepage/alumni/dstevick/lampert/Brunn7.htm
The surfaces are now tilted to each other in such a way that the air gap
increases from the bottom to the top. There is an easily visible defect in the form of a
central hill. The reason for this hill was a slightly defective pitch lap. The defect at the
edge is the turned-down edge of the concave tertiary which serves as reference. This was
easily verified by moving the secondary a little to the center (not depicted): the edge
defect disappeared.
![[Brunn 7 - Fringes]](FringeDe.jpg)
Author: Guntram Lampert and David Stevick
[Weird Telescopes Page]
[Brunn 6-inch Story]
Curator: Hartmut Frommert
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