RE: [ap-gto] Re: 155EDF and Traveler on the 900GTO


Mar 19, 2001

 


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#2130 Mar 19, 2001

While waiting for notification on the 900GTO mount, I am pondering

what will be the best way to attach both my 155EDF AND Traveler to

the mount.

Experience tells me to keep both instruments as close to the mount's

center of gravity as possible in order to reduce wind load and

counterweight. This means putting the telescopes closely side by side

on the same mounting plate. However, I did not find any accessory

plate that will allow for this "double barrel" configuration (maybe

because the width of the combination will interfere with the mount or

pier in some situations?)

On the other hand, with the Traveler riding "piggy-back" on the 155,

the distance between the 155EDF rings (65RING) on the 900RP ribbed

plate as seen in pictures, seems excessive for any existing accessory

plate/sliding bar configuration. And: will the Traveler's weight so

far out require counterweights that will push the set-up beyond the

900GTO's handling capabilities for imaging?

Anybody with experience - thoughts - solutions re. this subject?



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

#2131 Mar 19, 2001

Hi Dan:

I use the Losmandy side-by-side plate on my 1200GTO. Expensive but works

very nicely for a 130 EDF plus the 80 mm f11 guidescope. There is enough

room for larger scopes on both sides. I had the GTO equipped by A-P with a

Losmandy saddle so that it would accept the side-by-side directly.

Bert



Bert Katzung

katzung1@...

www.astronomy-images.com ----- Original Message -----

From: daniel@...>

To: ap-gto@yahoogroups.com>

Sent: Monday, 19 March, 2001 2:53 PM

Subject: [ap-gto] 155EDF and Traveler on the 900GTO





> While waiting for notification on the 900GTO mount, I am pondering

> what will be the best way to attach both my 155EDF AND Traveler to

> the mount.

> Experience tells me to keep both instruments as close to the mount's

> center of gravity as possible in order to reduce wind load and

> counterweight. This means putting the telescopes closely side by side

> on the same mounting plate. However, I did not find any accessory

> plate that will allow for this "double barrel" configuration (maybe

> because the width of the combination will interfere with the mount or

> pier in some situations?)

> On the other hand, with the Traveler riding "piggy-back" on the 155,

> the distance between the 155EDF rings (65RING) on the 900RP ribbed

> plate as seen in pictures, seems excessive for any existing accessory

> plate/sliding bar configuration. And: will the Traveler's weight so

> far out require counterweights that will push the set-up beyond the

> 900GTO's handling capabilities for imaging?

> Anybody with experience - thoughts - solutions re. this subject?



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

#2132 Mar 20, 2001

Date: Mon, 19 Mar 2001 22:53:59 -0000

From: daniel@...

>>While waiting for notification on the 900GTO mount, I am pondering

what will be the best way to attach both my 155EDF AND Traveler to

the mount.

Experience tells me to keep both instruments as close to the mount's

center of gravity as possible in order to reduce wind load and

counterweight. This means putting the telescopes closely side by side

on the same mounting plate. However, I did not find any accessory

plate that will allow for this "double barrel" configuration (maybe

because the width of the combination will interfere with the mount or

pier in some situations?) <



Hi Dan,



See: www.kldenmark/towardsinfinity/equipment/equip.html



I have an AP 1200 GTO, not a 900, but I use the Losmandy side-by-side with a

12.5" RC and a Starfire 130 mm EDF, plus a TAK FS-60C (not shown in the

pictures), plus ten pounds of cameras and 5 pounds of declination axis balancing

weight. The RC weighs 50 lbs. and the 130 mm Starfire weighs 15 lbs. The Tak

weights only a pound or two. Hopes this gives you some idea.



Larry

--



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#2133 Mar 20, 2001

Hi Bert,

Thanks for the valuable input. One question re. the loading: with the

130EDF plus the 80mm f11 guidescope your 1200GTO must have lots

of "reserve" left. Are you using another (bigger)telescope on the

1200GTO?

My 155EDF plus Traveler OTA's together weigh in at about 15kg, which

with 5kg of visual/imaging accessories still is way below the load

handling capacity of the 900GTO. Or do you think 1200GTO is the

better way to go? Like for most of us, portability is important to

get to my dark site (about 2 hours from Santiago/Chile) - at least

until I retire and can live at a dark site up north ;-)

Daniel

--- In ap-gto@y..., "bert katzung" katzung1@h...> wrote:

> Hi Dan:

> I use the Losmandy side-by-side plate on my 1200GTO. Expensive but

works

> very nicely for a 130 EDF plus the 80 mm f11 guidescope. There is

enough

> room for larger scopes on both sides. I had the GTO equipped by A-P

with a

> Losmandy saddle so that it would accept the side-by-side directly.

> Bert

>

> Bert Katzung

> katzung1@h...

> www.astronomy-images.com

> ----- Original Message -----

> From: daniel@r...>

> To: ap-gto@y...>

> Sent: Monday, 19 March, 2001 2:53 PM

> Subject: [ap-gto] 155EDF and Traveler on the 900GTO

>

>

> > While waiting for notification on the 900GTO mount, I am pondering

> > what will be the best way to attach both my 155EDF AND Traveler to

> > the mount.

> > Experience tells me to keep both instruments as close to the

mount's

> > center of gravity as possible in order to reduce wind load and

> > counterweight. This means putting the telescopes closely side by

side

> > on the same mounting plate. However, I did not find any accessory

> > plate that will allow for this "double barrel" configuration

(maybe

> > because the width of the combination will interfere with the

mount or

> > pier in some situations?)

> > On the other hand, with the Traveler riding "piggy-back" on the

155,

> > the distance between the 155EDF rings (65RING) on the 900RP ribbed

> > plate as seen in pictures, seems excessive for any existing

accessory

> > plate/sliding bar configuration. And: will the Traveler's weight

so

> > far out require counterweights that will push the set-up beyond

the

> > 900GTO's handling capabilities for imaging?

> > Anybody with experience - thoughts - solutions re. this subject?







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

#2134 Mar 20, 2001

HI Daniel,



Compared to the 1200 AP mount, the 900 is a much lighter load to carry and

to heft atop a portable pier. Unless you need the extra weight and torque

capacity (consider any larger scopes you might purchase in the future), the

900 may make more sense for your application.





Best,

John





daniel@... wrote:

[snip] > My 155EDF plus Traveler OTA's together weigh in at about 15kg, which

> with 5kg of visual/imaging accessories still is way below the load

> handling capacity of the 900GTO. Or do you think 1200GTO is the

> better way to go? Like for most of us, portability is important to

> get to my dark site (about 2 hours from Santiago/Chile) - at least

> until I retire and can live at a dark site up north ;-)



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

#2136 Mar 20, 2001

In a message dated 3/19/2001 2:54:52 PM Pacific Standard Time,

daniel@... writes:



> And: will the Traveler's weight so

> far out require counterweights that will push the set-up beyond the

> 900GTO's handling capabilities for imaging?

>



No problem for that mount. Load it down, it gets more stable.



Roland Christen





[Non-text portions of this message have been removed]



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#2138 Mar 20, 2001

--- In ap-gto@y..., "Larry Denmark" kldenmark@w...> wrote: > Hi Dan,

>

> See: www.kldenmark/towardsinfinity/equipment/equip.html



Sorry group... ATT is having server problems AGAIN and the above link

is currently out of service - although, based upon past ATT glitches,

it should be up sometime today.



(Those of you thinking about using ATT for you web host TAKE NOTE

g>).



Larry



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#2140 Mar 20, 2001

Hi Dan:

Yes, the 1200 is definitely overkill for the 130 EDF. I got the big mount

because I will be getting a 12.5 inch RC soon. (I may try the RC + 130 EDF +

guidescope all together on the 1200!) For your 155 + traveler, the 900

should be plenty. And you're right: the 1200 is not very portable!

Bert



Bert Katzung

katzung1@...

www.astronomy-images.com

----- Original Message -----

From: daniel@...>

To: ap-gto@yahoogroups.com>

Sent: Tuesday, 20 March, 2001 4:46 AM

Subject: [ap-gto] Re: 155EDF and Traveler on the 900GTO





> Hi Bert,

> Thanks for the valuable input. One question re. the loading: with the

> 130EDF plus the 80mm f11 guidescope your 1200GTO must have lots

> of "reserve" left. Are you using another (bigger)telescope on the

> 1200GTO?

> My 155EDF plus Traveler OTA's together weigh in at about 15kg, which

> with 5kg of visual/imaging accessories still is way below the load

> handling capacity of the 900GTO. Or do you think 1200GTO is the

> better way to go? Like for most of us, portability is important to

> get to my dark site (about 2 hours from Santiago/Chile) - at least

> until I retire and can live at a dark site up north ;-)

> Daniel

>



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#2141 Mar 21, 2001

One might note that that nice picture of M42 in the current S&T was taken

with a 12 inch on a 900GTO.



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#2142 Mar 21, 2001

Hi Jeff,



I believe Bill used a 1200GTO with his 12.5" RC for that shot (he

also has a 900GTO).



-Ray

> One might note that that nice picture of M42 in the current S&T was taken

> with a 12 inch on a 900GTO.

>

>

>

>

>

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