DEC Balancing



With an EXOS2, you're not going to be able to get a perfect DEC balance, and you probably don't want that anyway.  If you could achieve a perfect DEC balance, and then you pointed near-vertical, you would likely end up with the DEC axis rocking within its' gear lash (h/t Jerry).   If you're using a refractor, go camera-heavy, call it good, and don't worry about it being a little lopsided.  If you're using something else, then apply the concept as best you can.

Hope this helps...

Also - pls update your .sig with your gear - helps you get better responses.  :-)

- Bob

On Tue, Aug 11, 2020, at 07:41, Shailendra Sharma wrote:
How are you balancing your dec? Mine is near on impossible? Got a pic of how your cables are rooted? And how do you offset the balance due to the dec motor assembly?


From: <> on behalf of Mike Leemhuis <skislalom1@...>
Sent: Monday, August 10, 2020 7:59:03 PM
To: <>
Subject: [ESPMC-Eight] Pluto blink comparator astrophotography #astrophotography #EXOS2 #VIDEO
I decided last week to try to photograph Pluto since it was the only "planet" that I hadn't photographed yet with my EXOS-2.  So I used my plate solver to aim my ES 102CF and took about 40 - 1 minute exposures.  After stacking the pictures I soon realized that Pluto must either be too small or it must look like just another star because I couldn't find it in the hundreds of stars in the picture.  So I decided to repeat the process the following day and then compare the pictures to see what moves.  That would have to be Pluto.  My friend who is the head of the Astronomy club here in Lexington told me that's how Clyde Tombaugh found Pluto in 1930 although he used a mechanical blink comparator contraption to look for movement.  So I did that the modern way by using Affinity Photo to align both pictures and then made a short movie switching back and forth between the them.  I'll attach a link to the video here:
You can play this video in a loop and replicate with today's technology what Clyde did back in 1930. Pluto pops out if you look closely.  This would be a terrific science experiment for a high school student if you ever need an idea!


Location: Nicholasville, KY
Mount: Explore Scientific Exos-2
Scope: Explore Scientific ED102CF, Orion 60mm guidescope
Camera: QHY163C and QHY5L-ii
Filter: Optolong L-eNhance 2"
Software: ASCOM, PHD2, CDC, Stellarium, Sharpcap Pro, NINA, Deep Sky Stacker, Affinity Photo, Lightroom
Computer:  ASRock X570 Steel Legend, AMD Ryzen 7 3700X 8-Core Processor, 3600Mhz
Extras:  Lots of 3D printed parts I designed for improved usability

Mounts: ES PMC-8 EXOS2
Scopes: SV 102EDT, ZWO 60/280 Guide
Cameras:  Nikon D5300, Altair GPCAM2 290M
Software: ASCOM, CdC, AstroTortilla, BYN Pro, Sharpcap, PHD2
Computer:  Thinkpad x230, Win7Pro/64

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