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Discmount Extension... DM6 / DM4

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#1 chaoscosmos


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Posted 30 April 2013 - 08:23 AM

Hey all...

Has anyone used the 8" Discmount tripod extension on their DM6 or DM4? How do you like it? Is it stable? Still stable with a strong breeze? Have you found it necessary for getting the scope to the zenith? If anyone opted for the tall Discmount tripod instead of the standard tripod with the extension, why did you choose it and how has it worked out?


#2 ichdien


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Posted 30 April 2013 - 09:05 AM

Ray: I've used Tom's extension with the DM6. It works fine. Quite stable, and helpful keeping the OTA (A-P 155EDFS) away from the tripod (Rob Miller 36M) when I'm near zenith. That being said, I now use the Astro-Physics extension, which is lighter and more rigid. Costlier, though not crazy expensive.


#3 JMW



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Posted 30 April 2013 - 01:31 PM

I have the DM4 8 inch extension. Works fine. I have DM6 on a Losmandy to DM6 adapter sitting on top of a 12 inch Losmandy extension on a Planet with a Losmandy bracket. I bought a used DM6 with these parts and it works well. It works out to be 14 inches of rise above the Planet tripod which is good for my TEC-140.


I am curious about the AP extension. How does it mate to the Rob Miller Tri36M? Do you have the part number of the AP extension?

#4 tomcody



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Posted 30 April 2013 - 01:58 PM

I had the tall DM6 tripod, found it great, very lightweight (carry out of the house in one hand) and solid but a little too tall for me (I could not read the Sky Commander on top of the DM6) so I cut the legs by three inches to a height that was better for me. The only issue is when the scope was at zenith it might hit a leg depending on the position of the scope/leg.
I also used a Meade field tripod/Losmandy MA adapter and Losmandy 12" extension rig which had more clearance at zenith but was much heavier.
Depending on the weight of the scope (maybe up to 20 lbs) the standard DM6 tripod and 8" extension would probably be ideal, above that weight, I would recommend a Losmandy HD tripod/w Losmandy 12" extension for best results.

#5 mountain monk

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Posted 30 April 2013 - 04:38 PM

I have the 8' inch extension for my DM-6 and Planet. A great combination, but with the handle it still does not quite clear the tripod. Very close, though.

Dark skies.


#6 Tamiji Homma

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Posted 01 May 2013 - 09:16 AM

I use DM-6/DM-4 extension along with G11 mount base.

This is 6" f/8 refractor with DM-6/12" extension on FHD. It barely clears zenith.

Posted Image

When I really want to clear zenith, I add DM-6 extension, total 20" extension.

Posted Image

Both 12" and 20" extension setups are very steady and *HEAVY*.

Clearing zenith is a nice to have than a must have, IMHO.

By the way, here is weight info:
2.301 Kg: DM-6 extension
1.410 Kg: DM-4 extension
1.072 Kg: DM-6 G11 adapter
2.815 Kg: G11 12" extension


#7 gillmj24


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Posted 01 May 2013 - 01:11 PM

Handles a 180 refractor just fine!

#8 RodShea


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Posted 02 May 2013 - 03:03 AM

I use the DM6 8" extension with a DM6, An Astro-Physics AWT000 tripod, ans a 130mm f6.3 refractor. It is very, very solid. Winds strong enough to make dob users unhappy do not make a noticeable difference with this setup.

The bars in the extension are helpful as a handle. The extension does make it easier to look higher in the sky, but is not essential. Mostly, it raises the eyepiece when you are working high in the sky. If needed, you can reposition the SkyCommander if it gets too high.

Hope this helps,


#9 jhfenimore



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Posted 02 May 2013 - 09:48 AM

I purchased a 4 inch Discmount, tripod, and extension this spring at NEAF. I was concerned that putting an extension on the tripod might make the mount a little less stable, but I was wrong. The combination is rock steady. A huge improvement over my Gibraltar. I didn't want the tall tripod because the smaller footprint of the standard tripod lets me keep it a ready-to-go configuration in my space-limited garage.

A very short OTA might work well without the extension, but with a longer scope like my TV 102, it's an essential accessory.


#10 Jim7728



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Posted 02 May 2013 - 10:57 AM

The bars in the extension are helpful as a handle


Plenty stable for my MN-66

Angled handle still hits tripod legs near zenith, but can be removed or worked around.

#11 johnnyha


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Posted 03 May 2013 - 01:21 AM

The 8" extension with Discmounts tripod is stable, but the 8" Eagle Pier extension with Berlebach Planet is WAY more stable. ;) The damping time on my FS152 went from 3 seconds to .5 seconds.

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