Alun and Robin,

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#579478
Jack Martin
Participant

Alun and Robin,

That’s because I adjusted the micrometer hence the shift in wavelength.

I will repeat this without touching the micrometer an post pics.

I spent Sunday morning fiddling with it adjusting the collimator lens screws but the double line is still there.

When I took the belt off and went back 30 min later it had reverted to a single line !

Thanks for your inputs,

Jack

Essex UK