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Hi Malcom,
My personal approach would be to address collimation first as it is done on axis. Slight tilt will have little effect in the center of the image so it can be taken care of independently. Once the collimation is corrected the tilt can be corrected separately as you will know the aberrations in the outer field are due to the remaining tilt and nothing else ( barring under/over correction ). I could be wrong but that would be my approach and justification.
Cheers
Ryan
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