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How well a mount can be guided is complicated and almost all of the factors are beyond the mount itself.? Mount mechanicals, autoguider app tuning and configuration, primary imaging camera pixel size to guide camera pixel size ratio, guide scope mounting stability, guide scope camera stability, seeing air stability, cable configuration, wind, power stability etc., etc. all contribute to guided PE.? Any and all of this and more can and will screw up a night of imaging.??

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People like to blame the mount and there are some that are a little better than others.? But most of the time the alleged "bad" mount is just a victim of who owns it and the environment in it is used in.? ?

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Thanks Joe and Chip.? I average around 0.8 to 0.9 arc-seconds RMS using a 200mm FL guide scope and ASI120mm camera in the city with a 25 pound imaging setup.? I rarely get any better than 0.75.? I don't recall what I get at a Bortle 4 or 2 site.? I am not sure this is typical of the G11G or just my mount.? I don't want the buyer to get a mount that will not meet their expectations.

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Jim W
Phoenix, AZ. USA

Losmandy G11G w/ L6, NINA 3.0 / ASTAP, ASI2600MC Pro, Sky-Watcher Scopes, Canon L Lenses.

Jim,

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The stated imaging payload of the G11G is 60 pounds.? Many people with heavier and longer scopes are imaging on a G11G with good results.? My friend is imagining with a 10" f/8 Newt that is well over 65 pounds with good results.?

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I routinely load the 20+ year old G11G mount with over 60 pounds and image with it.? My guiding is very good, still well under 0.5" PE.? I normally image with the bespoke Parallax / AstroTech130mm f/6 SDT which has an oversized steel tube and 3.7" focuser and a Losmandy Side-By-Side saddle plate with ADM ALT/AZ aiming device and Meade LX200 10" f/6.3 SCT with 3" Moonlite focuser etc. etc.? this is a very heavy payload.??

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I think the buyer should not have a problem imaging with a G11G and 50 pounds of payload.?

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Is the G11G 60 pound spec for visual?? I usually use 2/3 or 3/4 of the stated load capacity for the imaging spec.

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Jim W
Phoenix, AZ. USA

Losmandy G11G w/ L6, NINA 3.0 / ASTAP, ASI2600MC Pro, Sky-Watcher Scopes, Canon L Lenses.

Hello Jim,

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It is my belief that yes you will be pushing the mount, the G11G,? you could be taxing the G11T also though not as bad.? I'm assuming that there is a dew shield involved too.? Either mount you will need the FHD tripod or one of those tripiers.? Stability starts at ground level, always.?? Also I'm assuming the scope is on a Losmandy bar, my opinion a cradle would be better but surely put you over the top.? Guiding should also be done with an OAG or ONAG, my opinion too.

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That was at F10,? at F6.3 you should be better.

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I had a C14 with a Homeyer cradle and a G11T, but I was visual and planetary.? That was three years ago, don't have the scope and my Neighbor has the mount.

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Joe

I have a prospective buyer for my G11G w/ LW tripod.? They know that the tripod will have to be upgraded to the heavy-duty tripod.? They plan to do DSO and planetary imaging with a 12” Meade SCT. ?Likely with and without a 0.63x FR/FF.? The F.L. of the scope at f/10 is 3048mm and at f/6.3 is 1,920mm.? They estimate the total weight of the imaging setup to be 50 pounds.

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My questions are…?

• Is 50 pounds pushing to limits of the G11G w/ Heavy Duty Tripod for imaging?
• Is a F.L. of 3,048 or 1,920 pushing the limits of the G11G w/ Heavy Duty Tripod for imaging?
• Would they be better off with a G11T?

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Jim W
Phoenix, AZ. USA

Losmandy G11G w/ L6, ZWO AM5N, NINA 3.0 / ASTAP, ASI2600MC Pro / ASI533MM Pro, Sky-Watcher Scopes, Canon L Lenses....etc