Sat, 01/03/2015 - 21:22
To answer a previous question...
I have the grating (a Baader 207 l/mm) mounted in a Neumann filter drawer. This allows the filter to be rotated to match the horizontal axis of the CCD. The spacers between the filter drawer and the CCD give the required dispersion.
A flip mirror at the front ensures that the "correct" target star is identified and positioned in the FOV to give a 1st order spectrum across the middle of the chip. I use an ATiK16ICs cooled mono camera.
This assembly can be mounted on any of my scopes - 4" Genesis, C9.25 or the C11
Works well
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207 lmm Grating set-up 001.JPG61.17 KB
Filter trays seem like a
Ken,
Filter trays seem like a simple, reasonable technology. Thanks for the picture - more food for thought.
Neil