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The trick with the two cameras is a flip mirror. It reverses one image in the vertical plane, but this is fixed in processing. The rotation is close, I set that up in the flip mirror when I'm positioning the target. Also the colour doesn't have to overlay exactly as the detail in the image is in the luminance. Image scale is governed by the distance from the Telextender to chip, which is the same to achieve focus, and the pixel size, which is also the same. The telextender is on the front of the flip mirror BTW.
Cheers and thanks for the comments
Stuart
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