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I wasn¡¯t sure exactly what to call this post. I went to a star party last night, got the goto working really well and basically enjoyed the evening. I went to M13, M57, M3, M92, and a few more M¡¯s. I was using my C14 and I was getting targets almost dead center, using the goto. My only problem is the position the mount likes go to with the goto. When I went to M13, for example, rather than putting the telescope on the west side of the mount to point my scope slightly east, the mount slewed my scope to the east side of the mount and I ended up on my knees, peering through my eyepieces with the scope almost touching the tripod. I have used Celestron mounts for the last few decades and they seem to be a bit more idiot proof. I guess maybe I need the idiot proof feature more than some people.?
Did I set the limits too far? I am not sure exactly how far I should set the limits of the RA.
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Hi Jeff
two possibilities come to mind (there may be more, but these are off the top of my head)
First is the target isn't reachable on the desired side of pier given your limits
Second, the Gemini prefers to say on same side of pier that it's on, so if your next target is reachable on the same side of pier, it will slew to it on same side of pier, even though it may be uncomfortable for you (and that certainly sounds like it). If you think this is the case, you can try manually slewing to your preferred side of pier (anywhere on that side) and then goto your next target, and it should stay on your desired side of pier
hth
I wasn¡¯t sure exactly what to call this post. I went to a star party last night, got the goto working really well and basically enjoyed the evening. I went to M13, M57, M3, M92, and a few more M¡¯s. I was using my C14 and I was getting targets almost dead center, using the goto. My only problem is the position the mount likes go to with the goto. When I went to M13, for example, rather than putting the telescope on the west side of the mount to point my scope slightly east, the mount slewed my scope to the east side of the mount and I ended up on my knees, peering through my eyepieces with the scope almost touching the tripod. I have used Celestron mounts for the last few decades and they seem to be a bit more idiot proof. I guess maybe I need the idiot proof feature more than some people.?
Did I set the limits too far? I am not sure exactly how far I should set the limits of the RA.
-- Brian?
Brian Valente portfolio
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Jeff,
I find the same incorrect Gemini calculation of the meridian as you.? It happens in my various mounts: G11, G11T, etc.? It happens in Gemini-1 and -2.? This problem has been in the Gemini system for a long time.? It does not happen all the time... on occasion something is being mis calculated and requires testing to figure it out.? That's the realm of software engineering and thorough testing.??
Here is a picture of one of my systems in it's first Cold Boot go-to.? First star GoTo it went to the wrong side of Meridian.? I have to watch for trouble and interrupt and do a Meridian Flip from Gemini.net if possible.??
So...the firmware needs further work.? Firmware often needs work! Even Sony sells cameras and then issues firmware updates.? The source code is locked up, like in the Sony case,? and cannot be improved by the users/owners group.? The company should get these issues fixed, of course.? At least for Gemini-2.? The G-1 is obsolete.
Best, Michael
I wasn¡¯t sure exactly what to call this post. I went to a star party last night, got the goto working really well and basically enjoyed the evening. I went to M13, M57, M3, M92, and a few more M¡¯s. I was using my C14 and I was getting targets almost dead center, using the goto. My only problem is the position the mount likes go to with the goto. When I went to M13, for example, rather than putting the telescope on the west side of the mount to point my scope slightly east, the mount slewed my scope to the east side of the mount and I ended up on my knees, peering through my eyepieces with the scope almost touching the tripod. I have used Celestron mounts for the last few decades and they seem to be a bit more idiot proof. I guess maybe I need the idiot proof feature more than some people.?
Did I set the limits too far? I am not sure exactly how far I should set the limits of the RA.
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Your photos show exactly what I mean. I can¡¯t complain about my G11T too much. The more I get used to it the slicker it is to use. I guess I thought the Gemini 2 software would be at least as clever as the Celestron software. I just have to pay more attention when my mount slews so I don¡¯t start hitting hard parts.
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So looking at Brian's post we understand the cause of the issue.??
From a Cold Boot the mount of course moves from CWD to the West.? So the first GoTo went West....which was totally wrong for the first star.? I didn't choose to move West...of course the mount is always moving West from CWD.??
It should be logically setting a software flag, so if this is the first GoTo after a CWD, the mount should figure out the GoTo that keeps the scope above horizontal.???
That's why I love engineering....always more to optimize.? But in this case, it's not my system.? Someone else has the ball.??
Michael
Your photos show exactly what I mean. I can¡¯t complain about my G11T too much. The more I get used to it the slicker it is to use. I guess I thought the Gemini 2 software would be at least as clever as the Celestron software. I just have to pay more attention when my mount slews so I don¡¯t start hitting hard parts.
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I set the limits to go about 110 degrees from vertical on both sides of the RA. I was wondering if I always have to slew the RA back to vertical rather than releasing the clutches and pushing it by hand. Does moving he RA by hand mess with the the limits I set, or doesn¡¯t it matter??
So you are saying that I can manually move my mount to the other side to point to my target and the pointing accuracy will still be good??
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I set the limits to go about 110 degrees from vertical on both sides of the RA. I was wondering if I always have to slew the RA back to vertical rather than releasing the clutches and pushing it by hand. Does moving he RA by hand mess with the the limits I set, or doesn¡¯t it matter??
do not loosen the clutches. use the hand controller for slewing
Definitely do not loosen the clutches at any point during an observing session where you are using goto.
I set the limits to go about 110 degrees from vertical on both sides of the RA. I was wondering if I always have to slew the RA back to vertical rather than releasing the clutches and pushing it by hand. Does moving he RA by hand mess with the the limits I set, or doesn¡¯t it matter??
So you are saying that I can manually move my mount to the other side to point to my target and the pointing accuracy will still be good??
-- Brian?
Brian Valente portfolio
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I guess my next question would be about setting limits. If I set the limits of my RA so it can¡¯t go more than 90 degrees from vertical, will that eliminate the problem of the mount going to very inconvenient positions when using the goto?
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I guess my next question would be about setting limits. If I set the limits of my RA so it can¡¯t go more than 90 degrees from vertical, will that eliminate the problem of the mount going to very inconvenient positions when using the goto?
It may be one or both of the things i previously mentioned Jeff
I guess my next question would be about setting limits. If I set the limits of my RA so it can¡¯t go more than 90 degrees from vertical, will that eliminate the problem of the mount going to very inconvenient positions when using the goto?
-- Brian?
Brian Valente portfolio
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Second, the Gemini prefers to say on same side of pier that it's on, so
if your next target is reachable on the same side of pier, it will slew to it
on same side of pier, even though it may be uncomfortable for you (and that
certainly sounds like it). If you think this is the case, you can try manually slewing
to your preferred side of pier (anywhere on that side) and then goto your next
target, and it should stay on your desired side of pier
***
Exactly..
This is what I do all the time.. I just slew ¡°all the way around¡±
and stop somewhere near the target that I know is ¡°over there¡±,
then do a GOTO..
?
Derek
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From: [email protected] [mailto:[email protected]] On Behalf Of Brian Valente
Sent: Sunday, June 20, 2021 5:24
PM
To: [email protected]
Subject: Re: [Losmandy_users_io]
G11T goto limits?
?
Hi Jeff
two possibilities come to mind (there may be more, but these are off
the top of my head)
First is the target isn't reachable on the desired side of pier given
your limits
Second, the Gemini prefers to say on same side of pier that it's on, so
if your next target is reachable on the same side of pier, it will slew to it
on same side of pier, even though it may be uncomfortable for you (and that
certainly sounds like it). If you think this is the case, you can try manually
slewing to your preferred side of pier (anywhere on that side) and then goto
your next target, and it should stay on your desired side of pier
?
I wasn¡¯t sure exactly what to call this post. I went to a star
party last night, got the goto working really well and basically enjoyed the
evening. I went to M13, M57, M3, M92, and a few more M¡¯s. I was using my
C14 and I was getting targets almost dead center, using the goto. My only
problem is the position the mount likes go to with the goto. When I went to
M13, for example, rather than putting the telescope on the west side of the
mount to point my scope slightly east, the mount slewed my scope to the east
side of the mount and I ended up on my knees, peering through my eyepieces with
the scope almost touching the tripod. I have used Celestron mounts for the last
few decades and they seem to be a bit more idiot proof. I guess maybe I need
the idiot proof feature more than some people.?
Did I set the limits too far? I am not sure exactly how far I should set the
limits of the RA.
--
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I may have fixed it. I looked at the RA limits and I had something like 151 degrees on the east side and 65 degrees on the west side. When I originally set the limits they were about 108 and 108 degrees, east and west. ?I reset the limits to 95 and 95. When the mount slewed to various targets it wasn¡¯t putting the eyepiece right next to the tripod. It looks like I need to check my RA limits at the beginning of each session.
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jeff marston
Michael Herman