Re: 1200DA question


Dec 1, 2004

 


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#11239 Dec 1, 2004

Hi folks.



I'm considering a used AP mount.

I read that the old 1200DA mount used stepper motors.

How noticable are the "steps" and were they microstepped?



Are the new mounts with servo's direct drive or belt driven?



Don



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#11241 Dec 2, 2004

In a message dated 12/1/2004 11:47:16 PM Central Standard Time,

glasspusher2001@... writes:



>

> I'm considering a used AP mount.

> I read that the old 1200DA mount used stepper motors.

> How noticable are the "steps" and were they microstepped?

>

> Are the new mounts with servo's direct drive or belt driven?

>

>



At very high powers you may be able to see vibrations with a stepper motor

drive if the telescope is light weight (SCT or other light weight Cassegrains).

It probably won't be visible in any astrophotos.



All of our mounts use precision gears to drive the worms, no belts.



Roland Christen





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



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#11244 Dec 2, 2004

Hello Roland



I know its not really the place to talk about SBig ccds but i know you have

the 10 XE and wondered if you or anyone had opinions on this versus the newer

more sensitive 10 XME?

I will be using various scopes TOA, C14, FS60c, and wondered what generally

this camera would perform versus my excellent SXVH9 mono?



Richard





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



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#11245 Dec 2, 2004

In a message dated 12/2/2004 11:08:13 AM Central Standard Time,

rvbest123321@... writes:



> I know its not really the place to talk about SBig ccds but i know you have

>

> the 10 XE and wondered if you or anyone had opinions on this versus the

> newer

> more sensitive 10 XME?

> I will be using various scopes TOA, C14, FS60c, and wondered what generally

>

> this camera would perform versus my excellent SXVH9 mono?

>



If you are looking for the most sensitivity for deep sky nebulae etc, then I

would go for the 10XME. If you are looking for slightly tighter stars to image

things like globular clusters, then I would get the 10XE. We had both types

on the 9" FastMax and found that the very short F4.3 focal ratio of that scope

needed the tighter images of the XE for best results. On longer focal ratio

scopes like the ones you are using, there may not be much, if any, difference in

star sizes.



Roland Christen





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



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#11247 Dec 2, 2004

Thanks for the information.

No real concerns -- I've heard nothing but good news about your

mounts.



Don >

> At very high powers you may be able to see vibrations with a stepper

motor > drive if the telescope is light weight (SCT or other light weight

Cassegrains). > It probably won't be visible in any astrophotos.

>

> All of our mounts use precision gears to drive the worms, no belts.

>

> Roland Christen


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