Re: Is this typical guiding performance for an older g8? RMS around.25 px , 1.0 to 1.6 arc seconds
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*IF*
you could Barlow that guide scope, or use a guide camera with smaller pixels, OR
BOTH) and still guide at a 1/4 pixel.. ?
?
But
¡°1.0 ¨C 1.6¡± ¡° with a focal reduced 80mm scope and a
DSLR would qualify as pretty much perfect tracking already, wouldn¡¯t it??
?
Derek
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From: [email protected] [mailto:[email protected]] On Behalf Of McFarlane, Gilbert via groups.io
Sent: Wednesday, March 03, 2021
9:58 PM
To: [email protected]
Subject: [Losmandy_users_io] Is
this typical guiding performance for an older g8? RMS around.25 px , 1.0 to 1.6
arc seconds
?
Stuck at home, I decided to learn more about phd2, and try to tweak my
mount.? ?All my efforts did not seem to have much of an effect.?
?I generally achieve RMS of about? .25px ,? and about 1.0"
to 1.6 ".? ?This doesn't sound great to me, I was hoping for
about half of that - but my images seem to be ok.? ?(Guide camera is
QHY 5L-II with 3.75 um, with 130mm QHY mini guide scope.? ?Camera for
imaging is a K5 Pentax dslr.? Imaging scope is an 80mm f6 APO with a Televue 0.8x flattener.)? ?
The most irritating part has been trying to reduce the Dec backlash measured by
PHd2 - which has stayed at 6 - 9 seconds despite numerous lubes, adjustments,
and even Belleview washers.? ? Motor is attached very tight.? I
have tried changing the balance, tight axis, loose axis.? Everything I
know to try other than replacing the motors or the little plastic motor
connectors - but they seem tight.? ?I tried switching the motors, but
no change in Dec backlash.? ?Any thoughts?
The mount has the separate worm blocks and brass worms.? ?Using the
492 controller and the ST4 camera controlled interface and USB 3.0.
Thanks, Gil
Ventura, CA
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