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Al - I *think* the collimation is OK, as I'm able to get nice round stars for regular astrophotography. But I'll check it.
Ken, I've got a DSLR that's 5184x3456 pixels. The grating is maybe 7-8 cm from the sensor. I'm using s 10" SCT with a 2540mm focal length, but a focal reducer bringing that down to 1600mm ... the upshot is that I'm getting about 1,400 pixels from zero order to the end of the red; 5.2 A/pixel.
I've been able to get *something* out of the spectra images I took on Friday by eliminating the curves by taking a 2-3 pixel horizontal slice out of the spectrum, spreading that, and feeding it through VSpec. Attached is my profile of Fomalhaut, compared with the AIIIV library spectrum. So I'm getting *somewhere*
Thanks for the tips, guys. I'll look at focus, collimation, and gettign horizontal to the sensor next clear night.
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