Hi All,
I have finally managed to attach a lens & rebuild the slit using razor blades, no idea of the slit width -judges by eye to be small.
I also managed to crack the grating.
It was a 200mm camera lens.
I learned that I can't attain focus with the ST7, so have to use the DSI.
This image is comp of 40x1sec exp mosaiced with another of the same.
Then croped for the best section of spectra.
Small steps.
