Re: How long for UNGUIDED imaging with non AE mounts?


Roland Christen
 


I can expect to achieve good unguided images with exposures in the tens of minutes? Maybe even up to 1 hour?
Probably not. I was doing unguided imaging with an encoder mount. I apologize if I misled anyone.
A mount that does not have shaft encoders is open loop and is at the mercy of the periodic error that is produced by the gearbox. One can minimize that error using PEM but that does not guarantee that it will track to sub-arc sec levels for an hour.

Rolando


-----Original Message-----
From: astro@...
To: main@ap-gto.groups.io
Sent: Thu, Feb 11, 2021 2:01 am
Subject: Re: [ap-gto] How long for UNGUIDED imaging with non AE mounts?

On Tue, Feb 9, 2021 at 11:15 PM, Roland Christen wrote:
I have gone up to an hour with 1000mm FL and 5.4 micron pixel camera.

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Roland Christen
Astro-Physics
First, excuse me for asking for clarification/confirmation of what you just stated. My excuse is I am a virgin with AP gear.

So I have a gto1100 (hopefully soon) without Encoders. All other things being equal, and at moderate focal lengths, I can expect to achieve good unguided images with exposures in the tens of minutes? Maybe even up to 1 hour?

Cheers
Bob

--
Roland Christen
Astro-Physics

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