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Old 16-05-2019, 08:30 PM
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Paul Haese
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Why is this happening?

Imaging with the AG12, a QSI660 and Astrodon filters I have noted that the Ha filter and Luminance filters are significantly different in focus. About 750 steps on an Atlas increase from the luminance to the Ha. OIII is about 1200 steps different.

Now, this never happened on the GSO f4 Truss Newtonian, so why is this happening on the AG12? Just out of interest I have made sure all the filters are tightened down correctly. The QSI683 has the same problem with the AG12. Is this a corrector distance problem? Two different correctors have been used on this scope. I am currently using a GPU. This problem also occurred on the OOUK Wynne.
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Old 16-05-2019, 08:39 PM
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I'd be looking at the polychromatic corrector data.

London to a brick the corrector is the culprit....imaging with and without it will
make clear whether it is the culprit.
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Old 17-05-2019, 10:39 AM
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I just went through this with a flattener. My blue filter was 220 microns away from the red. Took out the FF and problem gone. FF was definitely at right distance!


Peter
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Old 17-05-2019, 03:24 PM
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Thanks guys for the responses and ideas.

Quote:
Originally Posted by Peter Ward View Post
I'd be looking at the polychromatic corrector data.

London to a brick the corrector is the culprit....imaging with and without it will
make clear whether it is the culprit.
If this corrector and camera were used before on the other Newtonian, why would it be different on this Newtonian?

Quote:
Originally Posted by PRejto View Post
I just went through this with a flattener. My blue filter was 220 microns away from the red. Took out the FF and problem gone. FF was definitely at right distance!


Peter
It's certainly a puzzle to why this is occurring.
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