Ocular for DSLR gives a square instead of rectangular FOV

It is a bug:
https://bugs.launchpad.net/stellarium/+bug/687654

I've uploaded to Launchpad a test build of Stellarium that includes the fix:
https://launchpad.net/stellarium/+download

This new build will not start.

stellarium.exe - System Error
This program can't start because intl.dll is missing from your computer.
Try reinstalling the program to fix this problem.

I tried what this message says but it still did not work.

This new build will not start.

stellarium.exe - System Error
This program can't start because intl.dll is missing from your computer.
Try reinstalling the program to fix this problem.

I tried what this message says but it still did not work.

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Philippians 4:13

________________________________
From: Bogdan Marinov <email address hidden>
To: <email address hidden>
Sent: Mon, December 13, 2010 7:04:06 AM
Subject: Re: [Question #137606]: Ocular for DSLR gives a square instead of
rectangular FOV

Your question #137606 on Stellarium changed:
https://answers.launchpad.net/stellarium/+question/137606

    Status: Open => Answered

Bogdan Marinov proposed the following answer:
It is a bug:
https://bugs.launchpad.net/stellarium/+bug/687654

I've uploaded to Launchpad a test build of Stellarium that includes the fix:
https://launchpad.net/stellarium/+download

--
If this answers your question, please go to the following page to let us
know that it is solved:
https://answers.launchpad.net/stellarium/+question/137606/+confirm?answer_id=0

If you still need help, you can reply to this email or go to the
following page to enter your feedback:
https://answers.launchpad.net/stellarium/+question/137606

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I'm sorry, it seems that Stellarium had been linked to the wrong library during building.

I have re-built it and uploaded the new package to the same place.

The FOV rectangle is vertical instead of horizontal. It should be horizontal. The image scale is wrong in the rectangle. For example, when my DSLR with a sensor dimension of 23.3 x 14.9 is combined with my 80 mm refractor which has a focal length of 500 mm, the entire Andromeda Galaxy (M31) should fit almost snugly within a horizontal rectangle from one corner to the opposite corner. The way it is now, (M31) is too small (only 1/3 the size it should appear in my 80 mm scope0 and the rectangle is vertical.

UPDATE CORRECTION:

The Andromeda Galaxy (M31) and other deep space objects does fit in the rectangle properly when I set the Field Stop to "0" when setting up the DSLR as an eyepiece. But the Moon and Sun scale is incorrect. They are 3x or more too large in the rectangle.

The FOV rectangle is vertical. It should be horizontal.

It should neither be horizontal nor vertical, but how ever your camera is rotated with respect to some axis. THere is a defect/feature request to implement this feature.

Stellarium has no idea how my camera is rotated physically. So what it comes down to is what numbers I input for the x or y axis. The problem seem to be that no matter which number I use for the x or y axis, the rectangle is always displayed vertically in Stellarium. Shouldn't there be a rotation of the rectangle if I swap the numbers for x & y axis?

No; the X & Y axis are the dimensions of the CCD; they are in no way related to the cameras position on the mount, or telescope. These are fully independent variables.

If you build from source, or wait for the next release, you will have the ability to rotate the CCD.

I think that you are confusing the terminology. An axis has to do with position. Either vertical or horizontal. Dimension is only related if you are describing which axis is the length and which one is the width. In most applications, the X axis usually describes the left to right orientation or horizontal position of the CCD chip or camera as it relates to the observer's perspective.

Now, to make the issue clear, the problem we are having with this version is that the orientation of the CCD chip by default is viewed in a vertical perspective in this version if Stellarium. In Version 10.5 the orientation be default was positioned as horizontal. Which is how most imagers mount their DSLRs to their telescope.

The ability to rotate the orientation in the next version is fine but, that is not what we are asking now. We simply want the orientation of the CCD to be viewed horizontally.

I hope this explanation helps.

Thanks Treaves for the terminology. The [Equatorial Plane] is a term that explains what I was trying to get at.

QUOTE: ["The code as it now is aligns the X-axis with he width of the CCD - as defined in the configuration dialog."]

I will try to swap the chip dimension in the configuration and see if that changes the orientation. I just tried it with version 10.5 on my work computer and it did rotate the rectangle. I will try it on version 10.6 when I get home in the morning.

Thank you,

Ralph

Thanks treaves, that solved my question.

You won't see these changes unless you build from source, or wait for the next release; they are not in 0.10.6.1.