[ap-gto] Re: 1200 GTO counterweight shaft


Mar 18, 2000

 


----------------------------

#389 Mar 18, 2000

I was allowed to place an order yesterday for the 1200 GTO mount, so I'm

going over the A-P web site with a fine-toothed comb looking for other

stuff I should get with it.



I see that there is a "special" 26.9" counterweight shaft (M12661) men-

tioned as an available option. This raised some questions:



1) what is the length of the *standard* counterweight shaft?



2) what are the dimensions of the 10 and 18 pound counterweights?



I'm planning to put a 16" Ritchey-Chretien (or possibly the LOMO Hypergraph)

on this mount; consequently, I've ordered four 18 lb. counterweights and

one 10 lb. counterweight. I'm obviously concerned that 5 counterweights

will fit on the shaft.



I also have some of other questions:



a) A-P lists the capacity of this mount as "140 lb. instrument, depending

on length". Do they intend this 140 lb. to include the counterweights?

Or will the mount really carry a 140 lb. instrument plus over 100 lb. of

counterweights?



b) For astrophotography, would it be advisable to stay well below the 140

lb. instrument limit or is the rating conservative enough that the mount is

rock-solid even at the rated limit? (Yeah, aperture fever is causing me to

think of going to a 20" instrument :-)



c) I see folks here talking about using the polar alignment scope, but it

is not mentioned on the A-P web site (at least, not that I've found). Does

it come with one? Is it an option?



Thanks for any help.



Terry R. Friedrichsen



terry@...



----------------------------

#391 Mar 18, 2000

Terry:



I was lucky enough to order a 1200 gto Tuesday. I believe the answer to

your last question is that with go to capability, the two star alignment

method will get you as close to the pole as the polar alignment scope and

thus it is not offered as an accessory any more.



Dan Knauss ----- Original Message -----

From: Terry R. Friedrichsen terry@...>

To: ap-gto@egroups.com>

Sent: Saturday, March 18, 2000 12:14 PM

Subject: [ap-gto] 1200 GTO counterweight shaft





>

> I was allowed to place an order yesterday for the 1200 GTO mount, so I'm

> going over the A-P web site with a fine-toothed comb looking for other

> stuff I should get with it. . . .

>

>

> > c) I see folks here talking about using the polar alignment scope, but

it

> is not mentioned on the A-P web site (at least, not that I've found).

Does

> it come with one? Is it an option?

>

> Thanks for any help.

>

> Terry R. Friedrichsen



----------------------------

#396 Mar 18, 2000

c) I see folks here talking about using the polar alignment scope, but it

> is not mentioned on the A-P web site (at least, not that I've

> found). Does

> it come with one? Is it an option?



Although the GOTO makes the polar scope not absolutely necessary, the polar

scope allows you to set the mount very accurately before fine-tuning with

the GOTO. I find it a real time-saver. AP can no longer get them, so you

only have two options:



1) Buy one used. They command a premium price, unfortunately.



2) The Losmandy polar scope will fit if you get an adapter made. AP should

be able to give you the details of their threads, and Losmandy can do the

same for the polar scope. If enough people request one, maybe AP will make

their own adapters.



Gus



----------------------------

#398 Mar 19, 2000

Tony, 5 counterweights will fit the standard shaft.

Brad at RCO supports a 16" RC on his 1200 goto and is getting very nice

images.



John Gleason, dvj@...

www.celestialimage.com







---------- > From: Terry R. Friedrichsen terry@...>

> To: ap-gto@egroups.com

> Subject: [ap-gto] 1200 GTO counterweight shaft

> Date: Saturday, March 18, 2000 11:14 AM

>

>

> I was allowed to place an order yesterday for the 1200 GTO mount, so I'm

> going over the A-P web site with a fine-toothed comb looking for other

> stuff I should get with it.

>

> I see that there is a "special" 26.9" counterweight shaft (M12661) men-

> tioned as an available option. This raised some questions:

>

> 1) what is the length of the *standard* counterweight shaft?

>

> 2) what are the dimensions of the 10 and 18 pound counterweights?

>

> I'm planning to put a 16" Ritchey-Chretien (or possibly the LOMO

Hypergraph) > on this mount; consequently, I've ordered four 18 lb. counterweights and

> one 10 lb. counterweight. I'm obviously concerned that 5 counterweights

> will fit on the shaft.

>

> I also have some of other questions:

>

> a) A-P lists the capacity of this mount as "140 lb. instrument,

depending > on length". Do they intend this 140 lb. to include the counterweights?

> Or will the mount really carry a 140 lb. instrument plus over 100 lb. of

> counterweights?

>

> b) For astrophotography, would it be advisable to stay well below the

140 > lb. instrument limit or is the rating conservative enough that the mount

is > rock-solid even at the rated limit? (Yeah, aperture fever is causing me

to > think of going to a 20" instrument :-)

>

> c) I see folks here talking about using the polar alignment scope, but

it > is not mentioned on the A-P web site (at least, not that I've found).

Does > it come with one? Is it an option?

>

> Thanks for any help.

>

> Terry R. Friedrichsen

>

> terry@...

>

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