[APML] 8" 1200mm Dob using Heavy Duty Equatorial Mount.Is it possible?

[Tommy Lim <Tommy.Lim@omd.com.my>]

Hi to you guys out there,

May i ask you one question? is it possible if i put my 8" 1200mm Dobsonion to 
the Heavy Duty Equatorial Mount and plus a guidescope on the top of the 
Dob........

is it overweight? or i need to add more counterweight on it to balance up?

Can you give me some opinion on this point? 

Thanks

Tommy

-----Original Message-----
From: MIME @ Jaring {jml@astropix.com} 
Sent: Tuesday, November 13, 2001 10:43 AM
To: -@ Jaring {astro-photo@seds.org}
Subject: Re: [APML] Leonid plans


At 04:23 PM 11/12/2001 -0500, you wrote:
>For a 50mm f/2 lens on ISO 800 film on a tracking mount...
>
>The exposures are going to be about 10 +/- minutes each...
>
>Is alignment with a polar bore scope good enough? (No drift alignment)
>Would guiding help?  What if it's windy?


You should know from past experience how accurate aligning with just a bore 
scope is for your scope. It will almost certainly be good enough for 50mm 
without drifting.

Guiding would only help if you have absolutely atrocious periodic error, 
nevertheless, being anal, I intend to use the ST-4 to auto-guide, and I'll 
probably drift align also. (Hey, I said I was anal).

If it's windy, it will depend entirely on the stability of your mount and 
the level arm of whatever scope is attached to it. Polar alignment and 
guiding probably won't help with the wind at all.

Jerry
Astrophotography, Tips and Techniques
for Digital Enhancement in Photoshop:
http://www.astropix.com

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