Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.


Sign in to follow this  

Is anyone using APT's 'Auto Cancel Exposure' function?

Recommended Posts

I'm trying to get to grips with a few of APT's more esoteric functions.  Reading through the 152 page manual (I really should get a life!) I came across a function called Auto Cancel Exposure.  The manual describes the feature thus - "APT monitors the reported distance to the guiding star and if it becomes bigger than a defined limit the running exposure will be stopped before trails to become visible in the image, or to save imaging time for other exposure."

This strikes me a potentially very powerful tool, is anyone else using it?  If yes, how well does it work?  What would you recommend as the default auto cancel distance (the number of pixels the guide star moves before APT abandon's the exposure)?


  • Like 1

Share this post

Link to post
Share on other sites

I'd not noticed that feature. Thanks for pointing it out.:headbang: Next time there's clear sky I'll try it out. I often reject frames with slight trailing so this would certainly save losing imaging time.

Share this post

Link to post
Share on other sites

Was able to try this out last night. Initially set to 1.0 pixel. I typically do 300s sub-frames and managed to capture a run of 10 before light cloud caused PHD to begin losing the star.  The auto-cancel in APT kicked in at 221s (labelling the image as 'Incomplete') followed by a second at 28s. At first I was a bit annoyed that APT had cancelled the first frame - it still may have been usable if it had reached 300s! Upped the pixel value to 2.0 but unfortunately was clouded out and didn't any more frames.

However, on reflection, this feature would ensure only decent sub-frames are captured and it's made me realise that I've probably been including some poorer quality sub-frames in my final stacks. I know PixInsight has a Sub-frame Selector script but this feature in APT could help maximise imaging time. Thanks @Yoddha.

Also, if PC (or card) storage is limited, using this feature will require regular monitoring since on a bad night, sub-frames could mount up considerably.

Thanks again for mentioning the feature.

Share this post

Link to post
Share on other sites

I love APT, it has never let me down.  The great thing about it is if you want a feature then just contact Yoddha and if he agrees it's a good idea he'll likely code it into the next release or two!

Edited by kirkster501

Share this post

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By bottletopburly
      Having upgraded from canon 1000D to Nikon D5300  how do users of the 5300 find it for Astro I will be using with APT , and how do you take flats as I can’t use Av mode as there is nothing in tools menu to choose no lens ,  do you use in manual mode  and look at histogram ? .
    • By KevS
      This evening/morning I am having some problems getting my unmodified canon 600d to live view via apt. One hell of a palaver trying to get focused. Has any one suffered similar problems? Was working fine yesterday, tonight a bit of a disaster all round. I am running the feed for the guide camera down the same USB cable via a non powered hub, the camera works fine during the data gathering phase but no dam preview. Any suggestions would be greatly appreciated.
    • By bottletopburly
      Currently setting up a pi4 with indigosky which will be run via APT , running win10  and the the latest APT Beta release 3.75.2 , now I can connect to indigosky server via browser , but I can’t connect via APT  indigo control panel throws up an error can’t connect to indigo or indi server  server address is default Indigosky , server port 7624 , on pressing navigate server error says dns address can’t be found , has anyone been successful in connecting to indigosky via APT running win10.
    • By Hughsie
      I use the Celestron AVX mount and I also use Astrophotography Tool when imaging.
      When I start my imaging session I will undertake a two star alignment then move to my target and THEN platesolve to ensure I have the object centred.
      My question is do I need to bother with two star alignment (or any other Celestron alignment for that matter)? 
      My thought would be to Polar align then take a shot of Polaris and plate solve this, sync the result to the mount then “Goto” from there. The only issue I have is when you switch the mount on and enter time/date etc it asks you to do a star alignment so how do I ignore this or do I do just that, ignore it!
      Sorry for the rambling question.
    • By PembrokeSteve
      I am at the moment trying to set up "Dithering" on my APT. 
      I am presently using a Canon 600D, with Orion ED80 Refractor, mounted on my NEQ6PRO.
      Please note, I have not yet progressed to Guiding - NO GUIDING
      Do I basically select "APT Dithering" and maybe leave all the other settings at Default?
      Most grateful if anyone can let be know which settings I might need to adjust, and to what values.
      Finding it all a little bit confusing !
      Many Thanks


  • Create New...

Important Information

By using this site, you agree to our Terms of Use.