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Alt-Az for TOA-150?

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#1 Ozy

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Posted 26 July 2009 - 08:06 PM

For visual, I find it quite a process to setup my CGE. For star parties, the extreme height changes of the eyepiece at horizon vs zenith is pretty bad. I'd love to find an affordable Alt/Az with goto setup to swap it out for that could handle the TOA-150. Does anyone have any suggestions?

#2 Tamiji Homma

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Posted 26 July 2009 - 08:33 PM

For visual, I find it quite a process to setup my CGE. For star parties, the extreme height changes of the eyepiece at horizon vs zenith is pretty bad. I'd love to find an affordable Alt/Az with goto setup to swap it out for that could handle the TOA-150. Does anyone have any suggestions?


Go for DiscMounts DM-6 on G11 tripod. That's what I use with 6" f/8 refractor.

http://www.discmounts.com/

Tammy

#3 Herenomore

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Posted 26 July 2009 - 08:41 PM

A push-to (i. e., with DSC's) DM-6 won't have a problem. The only go-to alt-az that I am aware of is the iOptron and its other reported problems aside, it won't support the weight of a TOA 150.

#4 skyward_eyes

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Posted 26 July 2009 - 08:51 PM

The DM-6 mount is rated at a 40lbs. weight capacity, the TOA-150 is a 55lbs OTA not including eyepieces.

#5 Adam S

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Posted 26 July 2009 - 08:55 PM

I'd verify with Tom at Discmount that his mount will work (used one with fully loaded Tak FS 128 and TEC 140 without issues) for this load. Another possibility is a MaxLoad sold by Teton.

#6 drshr

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Posted 26 July 2009 - 09:21 PM

Or Giro XXL.

#7 Tamiji Homma

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Posted 26 July 2009 - 09:21 PM

Take a look at user gallery :)

http://www.discmount...y3/DMG3_p1.html

You'll see 7" f/8, TOA150 there. If tripod is robust, I think DM-6 can handle TOA150 f/7.3. I think you can avoid using weight band (4.8Kg extra) if you use long dovetail plate instead.

My system (WO FLT 152 f/8, 45lb) is lighter and longer than TOA150. I feel very secure on DM-6/G11 FHD tripod.

Tammy

#8 NoiseJammer

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Posted 26 July 2009 - 09:30 PM

My TOA150 spends most of it's life on my DM-6. You need a heavy tripod (I use the metal Tak one with a home made adapter) but the mount handles it with ease. It's useful to around 275x. There's a picture of my scope on Tom's site.

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#9 Tamiji Homma

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Posted 26 July 2009 - 10:03 PM

Hi Bruce,

Is DM-6 extender/adapter to Tak metal tripod made by Tom Peters?

I am considering to buy a new Tak metal tripod (announced on April 16th 2009).

Thanks.

Tammy

#10 Doug D.

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Posted 26 July 2009 - 10:51 PM

I owned a TOA 130 and a DM-6 and felt that the mount was near its limits with this OTA when paired with a Discmount standard tripod or a Berlebach UNI-24. I do think, however, the main limitation was the legs and maybe a G11 or pier would have worked more satisfactorily. I can't help but think that the TOA 150 would be pushing it but apparently not, according to Bruce, when paired with beefy legs. A TEC 140 is a different story altogether - a lot lighter and better balanced than even the TOA 130 and from what I hear, a great match for the DM-6.

Also with all that weight (i.e., TOA 130) off to the side on the DM-6 I was nervous about tipping without a lot of tripod leg spread, which then interfered with reaching zenith (but extension column or pier would help avoid this).

This is a personal opinion/decision of course but I really view a beefy Alt/Az and OTA like the AP140 I currently own only marginally less trouble to deal with than the same OTA on a quality GEM. Again, in my own opinion, the latter is also more pleasurable to use with such a scope but YMMV. I now pretty much restrict my Alt/Az viewing to ~4" or smaller scopes with a high quality Alt/Az mount. I happen to use a Half-Hitch but I'm sure I would be very pleased with a DM-4. The DM-6 was/is a wonderful mount but I ended up letting it go because of the weight and as mentioned, preference for using a GEM with a heavy OTA.






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