An interesting paper
describes a new design for an earthshine telescope. They describe the essential instrument.
It seems to me that:
1) they only have 2 lenses (although both are doublets – we have one doublet and two singlets)
2) Their masks (like our SKE) sits outside the telescope. At least, that makes it easier to fix when it breaks.
3) Their telescope is a Cassegrain system – so lots of optics there…
Hmm. We should try to understand this design in case we want to try fresh approaches. Perhaps it is an option for a FW-less CMOS-based system?
It seems their ‘instrument’ sits on a conventional telescope – so many many optical surfaces in total…
