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Hi Friends,
I was giving thought, and concern, to string spiders not providing very
good axial support,
no matter how tight the strings. With 3, the optimum and minimum, the
secondary can still
vibrate along the optical axis. Or have I misunderstood something about how
they might
be used?
If this is a problem, it occurred to me that the shadow cone from the
center of the secondary,
to the center of the primary, might offer a pathway for installing one more
vertical string that
would act as a guy at right angles to the secondary assembly. and with
very little tension
eliminate all vibration. Being in the shadow of the secondary it coudn't
add any more diffraction
error.
Thinking about stuff like this makes my head ache, so after superficial
consideration, please delete
without spamming me.
Regards to all,
Bill Kelley
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