Alun and Robin,

Forums Spectroscopy More Lhires III mods Alun and Robin,

Mr Jack Martin

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,


Essex UK