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Field rotation angle

 I have difficulty in understanding how this works. I understand when zero is entered north should be up in my camera's FOV. However, when I advance  the time, this is changing both in Horizontal and in Equatorial mode. The orientation of the object is changing relative to the camera's FOV frame which shouldn't be the case, at least in the equatorial mode. I could demonstrate this better if I could send a series of screenshots to you. 

Ok, I have uploaded them to dropbox

The first one shows Polaris up and Pherkad centered

https://www.dropbox.com/s/qhx9mawhu75c32v/IMG_1653.PNG?dl=0

In the shot time is advanced by one hour. It shows the same view but this is misleading.

https://www.dropbox.com/s/uvwu0v0w6yhs8et/IMG_1654.PNG?dl=0

The moment I press "center" button again or if I advance time 2 hours it changes to the following

https://www.dropbox.com/s/xwkrzbba463v6in/IMG_1655.PNG?dl=0

Polaris keeps drifting from the middle top of the frame towards left when I advance the time further

https://www.dropbox.com/s/s28u687la09q5gs/IMG_1656.PNG?dl=0

https://www.dropbox.com/s/qs4vn2345tlbnj5/IMG_1657.PNG?dl=0

Maybe I'm doing something wrong :) 

Many thanks for your time.

Sedat

Date Votes

9 comments

  • 0
    Avatar
    Bill Tschumy

    Sedat,

    What do you have as your mount type?  The reticle orientation differs depending on if it is an Alt/Az mount or Equatorial.  I'm assuming you have an equatorial mount specified since the rectangle is tilted with respect to the horizon.

    Also, are you connected to a scope when doing this or have you enabled "Show even when not connected to a scope"?

    What is your Lat/Lon?

    I'm not seeing your problem so I want to get the same settings as you.

  • 0
    Avatar
    Sedat Bilgebay

    Hello Bill,

    You hit the nail on the head with your first question. As I was working off line, it never occurred to me that I should first chose the correct mount type. This was a long time inconvenience and mystery for me. Everything is fine and works as expected now.

    Thank you so very much!

    Best

    Sedat

  • 0
    Avatar
    Bill Tschumy

    Great, glad it was a simple fix.

  • 0
    Avatar
    Sedat Bilgebay

    Operator error :lol:

    Thanks again, this is a tremendous help to me. SS is my work horse for many things before, during and after imaging. This part was ailing due to my error.

    Cheers

  • 0
    Avatar
    Cockypops

    I might add that while the default 'equipment' for SkySafari Pro 5 on MacOS was an equatorial mount, it was not specified on iOS. So while I could plan framing of moving objects on the desktop (e.g. see a comet move in the fixed frame over time), I was challenged by odd Framing rectangle rendering on iOS when animated through time (referenced to the horizon, not the stars). Once I changed the 'equipment' in iOS to an equatorial mount, the framing rectangle finally behaved as desired. For those with no mount, I think the default on iOS should match that of MacOS as a field rotation angle fixed to the stars is likely more often desired, certainly by anyone imaging.

    To confound the confusion on iOS, the field rectangle rendering is a little buggy using default 'equipment' settings. When stepping one step ahead or back in time, the field rectangle may not move, but upon making the second step, it rotates to preserve its alt/az orientation.

    Thanks for these great tools,

    Arlo Reeves

  • 0
    Avatar
    Bill Tschumy

    Arlo,

    The default mount type on all platforms (iOS Mac and Android) is "Alt-Az GoTo".  It is not Equatorial.

    I can look into the reticle not updating properly (which I find surprising).  When you see this are you actually connected to a scope or do you have "Show even when not connected" enabled?  Is this for Alt-Az or Equatorial.

  • 0
    Avatar
    Cockypops

    Thanks for the response, it's quite possible I'm not using the app correctly and if this is the case I apologize.

    I've captured the reticle animation issue mentioned in my post above in an unlisted video of SSP 5 running on my iPod touch 6 running iOS 10.2.1 here:

    https://youtu.be/zpWY9SKvDdA

    It's not as I expected when the Settings->Telescope Setup->Mount Type = Alt-Az. GoTo, but does work as expected when the Settings->Telescope Setup->Mount Type = Equatorial GoTo (German). I have not tested all combinations of these settings, nor verified the behavior also exists on my iPad Pro 12.9.

    Thanks again,

    Arlo

  • 0
    Avatar
    Bill Tschumy

    Arlo,

    I think I have this fixed.  It seems to only be a problem on iOS.  Mac and Android work correctly.  Thanks for reporting it.

  • 0
    Avatar
    Cockypops

    Awesome. Thanks Bill. I will let you know if I find anything else - usually I just haven't dug deep enough.

    Arlo

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