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How can I achieve correct focus on Mars?


Moonshed

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I took my first image of Mars tonight with my new ZWO ASI 224 MC Colour camera. I found it difficult to determine when it was in correct focus. I know it sounds a bit daft but with the image looking blurry anyway even at best focus I found it really difficult so I am looking for any tips.

I use an electric focuser and I viewed the image on FireCapture.

For stars I use a Bahtinov  mask but I’m not aware of any focus masks for planets.

Any advice would be appreciated.

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