Re: Expected tracking times *Unguided #EXOS2 #TECHNICAL


Chris Tardif
 

Doh, you’re right.  It’s diameter of 30mm, F4 and 120mm focal length.

 

Sent from Mail for Windows 10

 


From: MAIN@ESPMC-Eight.groups.io <MAIN@ESPMC-Eight.groups.io> on behalf of Wes Mcdonald <wesmcd6@...>
Sent: Thursday, June 13, 2019 2:01:58 PM
To: MAIN@espmc-eight.groups.io
Subject: Re: [ESPMC-Eight] Expected tracking times *Unguided
 
Chris

It's the focal length ratio.  The 30mm guider has a focal length of what, 150mm?100?.  Your 400 mm lens has a FL of 400.  Ratio about 3.5 to 4.

Wes

--
Wes, Southport NC
PMC-8, ES ED 127, 10" LX200GPS, Astro-Tech 8" Newt, ETX-90
Polemaster, Orion ST-80 and SAG
Electrical Engineer, Retired

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