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That is in order to avoid that wedges compensate each other.
Wavefront
Need to check this:
Probably look at focal spot cameras, NF/FF or so with and without these beam splitters.
Identify if there is any change in spot quality. Might need the SAGAs for this.
The collimation will in any case vary if we do this at the current test position before the relay imaging.
Quote for mirrors (arrived first week Dec):
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