CCDSPEC Spectrometer - choosing an eyepiece

[athornett]

I am quite excited about this new Meade Illuminated 9mm eyepiece – it has adjustment screws which can Chang ether XY position of the cross hairs and allow me to align the cross hairless exactly over the spectrometer slit on my CCDSPEC spectrometer overcoming a problem I have using it at Night – the fact that i can’t see where the slit is in the dark!! Up until now I have relied on the fact that a star separates into a small spectrum when it reaches the slit but this can be hit and miss at Night.

I have tried 12.5mm illuminated eyepiece without adjustment – that is OK but the cross hairs are not quite on the slit so still can be difficult in practice getting single star in correct position.

Can’t wait to try this out under the stars….

For more details see https://roslistonastronomy.uk/new-illuminated-eyepiece-for-ccdspec-spectrometer

Andy

[athornett]

Reflecting on experience now an illuminated ridicule eyepiece with variable XY movements is the best eyepiece for my spectroscopy. Great purpose! Andy

[Merlin66]

A good solution....

I have to ask, how do you intend to guide during your exposures?

An ASI 120 or similar would do the job.