I started by cutting Paul G’s LowSpec body in order to experiment with various designs. It was clear that, whilst it’s a great little spectroscope, the main ‘usability’ issue is with the guide module.
Further, that designs such a Christian Buil’s recent printed Czerny Turner was lacking a guide unit.
Don’t laugh but… I could bolt this to the front an ‘anything’. The hole on the right panel is the reverse side of the slit/mirror mount.
It places the mirrors and guide lens at the same place (and in the optical plane) as the LowSpec but allows collimation adjustment of both. It also allows for larger types of both (to a limit of 25mm diameter). It uses the Alpy mirror/slit but it’s not a big job to ‘print’ others in. Tests to follow.
Also, just to shoot the breeze in terms of the fibre injection unit on another thread… Could I now mount that ‘holed’ mirror with fibre in place of the mirror/slit? Further, could I use the Shelyak fibre connector coupled with that mirror?