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16" f3.75 concave
paraboloid |
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The left Ronchi image was the surface as provided
by the outside optician. Clearly the surface was not smooth like
they stated it was. The faint spikes that are eminating from
the central shape are texture on the surface of the mirror; Mid-Spatial
Frequency (MSF) errors - historically called primary ripple. |
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Dream had the coating stripped
so both the figure and the smaller-scale surface could be improved,
which is shown on the right. |
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"The original mirror’s finish
was horrible. You have done an excellent job in improving the
finish. It is as close to theoretical as possible. I really appreciate
all the extra effort. Again, thanks for all your extra time to
get the mirror right."
"I really appreciate the details.
You do great work and that is why I have been very patient with
the process. The extra effort you put into the products is amazing.
There is NO company out there that is as driven as you to strive
for the best. I look forward to using the exceptional telescope
you have created."
"Again, thanks for all your hard
work and tenacity." |
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- Dream customer for
this mirror/telescope |
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Mike Lockwood of Lockwood Custom
Optics illinois US 2160 Birch Rd. Arcadia Kansas 66711 |
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Lockwood Custom Optics 648 Country
Road 1700 E Philo IL 61864-9724 |
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Lockwood Custom Optics Mike Lockwood
mirrors@loptics.com |
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lightweight primary mirrors, lightweight
high quality primary mirrors |
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The outside optician's surface was slightly overcorrected
at the 70% zone. |
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The outside optician also left a central hill that
could have been reduced in roughly four minutes of work, or eliminated
completely, as Dream's finishing illustrates. |
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The outside optician also stated
the radius was within 1/8" of what Dream requested. As provided
the radius was short by 1-3/4" (off by 1.5%). The 16"
f3 paraboloid that Dream finished in-house for the IR telescope was off by 0.009%
(167x closer). |
