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Astrophotography forum => Mounts Questions & Expirience => Topic started by: Roger Evans on December 30, 2017, 02:34:00 PM

Title: Limitation with G11
Post by: Roger Evans on December 30, 2017, 02:34:00 PM
When the mount approaches the North South meridian as the scope is facing toward the east...the guide star starts to drift in declination. It starts this at about an hour before it would be reaching the meridian. Becomes more pronounced as the angle to the southern decreases. So, not really an issue when I am imaging cassieopia objects but major issue when I am imaging Orion objects. I have tried shifting weight balance several times back and forth and no change. There is no cord pulling. This doesn't happen when the mount starts from the other side. Is this just a limitation of the Losmandy G11 mount?..would be nice to get that extra hour. My polar alignment is perfect and I have redone phd calibration at this point just to see but no change. My guidescope and guide camera are fixed and stable.
Title: Re: Limitation with G11
Post by: Maurice Deuschle on January 01, 2018, 09:57:13 AM
Have you done a Meridian Flip?

https://www.youtube....h?v=3AdODjqwTV4 (https://www.youtube.com/watch?v=3AdODjqwTV4)
Title: Re: Limitation with G11
Post by: Nong Inthisorn on January 04, 2018, 12:46:30 AM
Quote
When the mount approaches the North South meridian as the scope is facing toward the east...the guide star starts to drift in declination. It starts this at about an hour before it would be reaching the meridian. Becomes more pronounced as the angle to the southern decreases. So, not really an issue when I am imaging cassieopia objects but major issue when I am imaging Orion objects. I have tried shifting weight balance several times back and forth and no change. There is no cord pulling. This doesn't happen when the mount starts from the other side. Is this just a limitation of the Losmandy G11 mount?..would be nice to get that extra hour. My polar alignment is perfect and I have redone phd calibration at this point just to see but no change. My guidescope and guide camera are fixed and stable.

Never seen this up to 10 degrees past meridian. Leveling?

Regards,

Charlie B
Title: Re: Limitation with G11
Post by: Jason Pederes on January 08, 2018, 04:47:55 AM
Quote
Quote

When the mount approaches the North South meridian as the scope is facing toward the east...the guide star starts to drift in declination. It starts this at about an hour before it would be reaching the meridian. Becomes more pronounced as the angle to the southern decreases. So, not really an issue when I am imaging cassieopia objects but major issue when I am imaging Orion objects. I have tried shifting weight balance several times back and forth and no change. There is no cord pulling. This doesn't happen when the mount starts from the other side. Is this just a limitation of the Losmandy G11 mount?..would be nice to get that extra hour. My polar alignment is perfect and I have redone phd calibration at this point just to see but no change. My guidescope and guide camera are fixed and stable.

Never seen this up to 10 degrees past meridian. Leveling?

Regards,

Charlie B
Leveling? No. Balance? Perhaps.
Title: Re: Limitation with G11
Post by: unetankem on January 11, 2018, 10:56:11 AM
Quote
What is leveling ?

Seeing the mount is level, this generally not a critical as balance is though but the level should be reasonably close.
Title: Re: Limitation with G11
Post by: Jorge Herbert on January 12, 2018, 06:12:37 AM
Quote
Have you done a Meridian Flip?

https://www.youtube....h?v=3AdODjqwTV4 (https://www.youtube.com/watch?v=3AdODjqwTV4)

yeah, I have ..but I have to wait about an hour to get the object back in sight
Title: Re: Limitation with G11
Post by: Rodrigo Page on January 17, 2018, 12:15:03 AM
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Quote

What is leveling ?

Seeing the mount is level, this generally not a critical as balance is though but the level should be reasonably close.
oh yeah, right.., ...yeah, it's leveled
Title: Re: Limitation with G11
Post by: unoritvie on January 20, 2018, 09:55:54 PM
Have you already asked on the Losmandy Yahoo forum? If not, I'd suggest doing so, that is where you will find a much deeper depth of knowledge of Losmandy users.
Title: Re: Limitation with G11
Post by: rioclamabik on January 21, 2018, 07:44:31 AM
Quote
Quote

Quote

When the mount approaches the North South meridian as the scope is facing toward the east...the guide star starts to drift in declination. It starts this at about an hour before it would be reaching the meridian. Becomes more pronounced as the angle to the southern decreases. So, not really an issue when I am imaging cassieopia objects but major issue when I am imaging Orion objects. I have tried shifting weight balance several times back and forth and no change. There is no cord pulling. This doesn't happen when the mount starts from the other side. Is this just a limitation of the Losmandy G11 mount?..would be nice to get that extra hour. My polar alignment is perfect and I have redone phd calibration at this point just to see but no change. My guidescope and guide camera are fixed and stable.

Never seen this up to 10 degrees past meridian. Leveling?

Regards,

Charlie B
Leveling? No. Balance? Perhaps.
Another thought! Cable dragging!

Regards,

Charlie B
Title: Re: Limitation with G11
Post by: Coco Moten on January 25, 2018, 08:58:56 PM
Quote
Quote

When the mount approaches the North South meridian as the scope is facing toward the east...the guide star starts to drift in declination. It starts this at about an hour before it would be reaching the meridian. Becomes more pronounced as the angle to the southern decreases. So, not really an issue when I am imaging cassieopia objects but major issue when I am imaging Orion objects. I have tried shifting weight balance several times back and forth and no change. There is no cord pulling. This doesn't happen when the mount starts from the other side. Is this just a limitation of the Losmandy G11 mount?..would be nice to get that extra hour. My polar alignment is perfect and I have redone phd calibration at this point just to see but no change. My guidescope and guide camera are fixed and stable.

Never seen this up to 10 degrees past meridian. Leveling?

Regards,

Charlie B
Leveling? No. Balance? Perhaps.[/quote]
Another thought! Cable dragging!

Regards,

Charlie B[/quote]
yeah, i covered that (cord pulling in the OP)..I have had that happen to me before though ...
Title: Re: Limitation with G11
Post by: massgisttesci on January 26, 2018, 12:43:07 AM
Quote
Have you already asked on the Losmandy Yahoo forum? If not, I'd suggest doing so, that is where you will find a much deeper depth of knowledge of Losmandy users.

Oh right, duh...thanks!
Title: Re: Limitation with G11
Post by: Robert Estrada on January 30, 2018, 05:34:35 AM
what is odd about this is that I do polar alignment with the scope/mount near this position ...perhaps my guide scope and guide camera are colluding against me