ATM Airy eyepiece

[David Davis <vorblesnak@yahoo.com>]

Sidgwick, (Amature Astronomer's Handbook), talks about
it a bit on page 140 ...

"8.4.10 The Airy ocular: A development of the
Huyghenian, but not a notable improvement apart from a
slight gain in spherical correction.  It consists of a
convergent meniscus field lens and a crossed biconvex
eye lens.  It has been reported to be usable at
relative apatures where the spherical aberration of an
ordinary Huyghenian would be prohibitive."

The Huyghenian is a fairly simple eyepiece to make
being comprised of two elements.  I suppose if you
could get a flint field lense and size the stop right,
it could be good eyepiece.  I don't know the design
well enough to go beyond that.  I know a criticism of
the Huyghenian is that the image is formed between the
lenses which amplifies many of the defects.

David Davis
vorblesnak@yahoo.com

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