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alistairsamI just did a quick play with Excel and the formula listed on that page. Assuming a path of 1.5 Meters, mild steel and a temp shift of 10 degree's C and assuming that I've done the maths right the change in length is 0.195 mm.
That's a basic check assuming that the only factor is the change in the length of the steel tube which is probably not a good assumption but it's a start.
Anybody got any comments on the impacts of thermal contraction/expansion on focus for a 12" Skywatcher primary?
Again not a practical issue for me yet but I enjoy the learning.
Bob
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