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Mount for ISTAR 150 f15

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#1 telescopemullet

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Posted 29 December 2010 - 11:57 AM

This scope is coming my way in January. It weighs 35 lbs, say 40 with focuser and finder scope.

My budget for mount and tripod/pier is 2300.00.

I am leaning towards the G11 but over in the refractor section it was suggested that I could get away with an Atlas if I rigged up a Hargraves Strut.

My question is, what should I do, going with the latter constitutes a 1000.00 savings essentially but if this is going to be holding up a house with straws then forget it.

This will be a visual scope only.

#2 skybsd

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Posted 29 December 2010 - 12:50 PM

Hello,
Does your budget really accomodate a G11- or is this a stretch for you?
Do you intend to install your mount onto a permanent pier, or will you be requiring a tripod?
Do you need GoTo?

Regards,

skybsd

#3 telescopemullet

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Posted 29 December 2010 - 01:00 PM

The G11 on a tripod for 2195 is okay, but I think I will need two additional 21 lbs counter at 1-hundo a pop and I recall that I also need to get the power source for whatever that costs. Goto would be nice, which is why I like atlas, but not required.

At this time, tripod.

#4 skybsd

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Posted 29 December 2010 - 01:12 PM

Hello,
For that payload, with a requirement to use a tripod, you're better off with the G11 - as long as you can afford it though, okay?

The weak link in the Atlas' system for this payload x moment arm, is the tripod & altitude fulcrum assembly.

Suggest putting a wanted ad for a few weeks before commit cash for brand new at this time.

Hope this helps..,

Regards,

skybsd

#5 telescopemullet

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Posted 30 December 2010 - 02:41 PM

After talking with Optic-Craft, looks like I will be getting their Model 2 mount with a 6.6-inch RA drive. Really nice guy there, patient and very helpful. Says this set-up will handle the beast ISTAR easily.

#6 mikey cee

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Posted 30 December 2010 - 05:27 PM

When I first saw this thread I said to myself when will these folks ever learn? I of course have used a beefed up copy of a Model 7 for 30 years. I'm so glad to learn that you have made the correct decision. You won't be sorry. In the dark who cares if it's pretty or not. Matter of fact I think they have that "industrial" look to them that I rather like. It says I'm here to do the job! :smirk:Mike

#7 Don Allen

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Posted 31 December 2010 - 09:04 PM

Mullet,

Is the altitude on the Optic Craft adjustable or is it fixed for your location?

#8 7331Peg

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Posted 01 January 2011 - 01:57 AM

Another question: I see Opti-Craft sells the drives separately. Does the basic version come with some kind of slow motion control - and does it allow you to slip the clutches, like a manual G8 or G11, or do they have to be released from a locked position in order to move the scope?


John :refractor:

#9 mikey cee

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Posted 01 January 2011 - 10:47 AM

They are similar to my drive sytem in that they can be overrode without loosening any knobs. I may at a future date have them fabricate me a new one. I like their simplistic operation. Like mine they look to me to be able to ieliminate any and all backlash. ;)Mike

#10 telescopemullet

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Posted 01 January 2011 - 11:08 AM

He says it is fixed at 45 degrees.

#11 telescopemullet

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Posted 06 January 2011 - 08:40 PM

It's official, here's what a coming in 4 to 6-weeks. I just love the sound of it all....

Model 2 equatorial head assembly using 2.5" diameter shafts 1018 cold roll steel, with 24" long counter weight shafts and locking knobs. Also teflon bearing will be installed.

2.5" 303 stainless steel shafts for Model 2

6.6" Clock drive assembly with control box and installed on Model 2 with AC Hurst sync motor

Cradle 160MM OD tube. Made from aluminum with felt lined half circle supports and steel bands with take up tension knobs for clamping tub to cradle

Wedge made from aluminum plates square box design with turn buckle up / down movement for alignment and set for approximately 33 degrees with +/- 15 degrees adjustment and attached to top of your tripod base.

6" die cast setting circles black with white etched lettering

WARRANTY-- 5 years parts and labor

The best part, wayyyyyy under budget.

#12 AlienRatDog

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Posted 07 January 2011 - 07:33 AM

How much?

#13 telescopemullet

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Posted 07 January 2011 - 10:26 AM

1700 plus he is fabricating an attachment thingy for my existing tripod so I don't have to but a new one.

#14 Don Allen

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Posted 07 January 2011 - 09:14 PM

Sound great. Of course we expect to see some pictures.

#15 telescopemullet

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Posted 07 January 2011 - 09:50 PM

Of course!

#16 mikey cee

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Posted 08 January 2011 - 12:03 PM

Are your shafts the cold rolled steel or the SS? :question:Mike

#17 telescopemullet

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Posted 08 January 2011 - 01:00 PM

The latter.

#18 telescopemullet

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Posted 15 March 2011 - 10:40 AM

I'll post some photos soon but in the mean time I wanted to post on the performance of this mount with the 35 lb plus nine-foot long scope that is attached to it. The mount is superb for visual. Once the scope is balanced, movement to a target is of course achieved via manual efforts. There are no fine tune abilties but it is very easy to move even such a large scope in tiny increments. Any vibrations are dampened quickly, even after manually focusing the moonlite the image settles very quickly. I am glad I did go with the motor focus option as this ensures zero image movement.

Tracking is excellent, even without a precise polar alignment. I had the moon centered with a 9mm and the image stayed centered for more than one hour, then I called it a night.

This rig is old school, know that going in. But this made in the USA inexpensive mount more than handles this long achro, even without a hargraves strut.

I am not the most techy of people but if you have any questions about this mount, let me know.

#19 Don Allen

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Posted 15 March 2011 - 06:23 PM

Good to hear! How is it at Zenith? On your knees?







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