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Hi Will,
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Yes, my suggestion is to use the reducer on the main optic to get the required FOV so the ASIAIR can plate solve reliably.?
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Okay so you are using an OAG with the ASI120mm, this will work regardless of focal length because with an OAG you are using the same focal length as the main optic and the pixel image scale will be well under 1:2 with the cameras you have.? That said it is hard to get good autoguiding results with a small sensor autoguider camera using an OAG, typically there are not many stars on the edge of the light cone that are suitable for guiding due to distortion.? It might work okay some of the time but may be a major struggle to get reliable guiding with your setup.?
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Oh, okay you might benefit from using your imaging system to do EAA.? Stacking images to get a larger image on a screen, phone of tablet.? This will be a help for sure.? ? ?
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Chip Louie Chief Daydreamer Imagination Hardware?
? ?Astrospheric - South Pasadena?
Chip Louie