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The distance between the prism and the guide needs to be the same as prism to your Atik (33mm). Your guide cam is at 43mm so you need to be closer to prism. Can't move it closer? Then increase (with a spacer by 10mm) the distance between the prism and the Atik to make it 43mm.
So a 10mm spacer in front of your Atik.
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