I've finally managed to get out and capture some spectra again.
This is the first run with a new setup: ED80, SA 100 on the end of an Orion 3x barlow body and the DMK 41AU02.AS. On paper I thought I could get about 4 A/pixel dispersion with this setup if I can achieve focus.
Well I can achieve focus
but ATM the focus is not very good
... With my C8 and Motofocus I could be sitting at the puter and tweaking the focus
. Unfortunately, I'm not that sophisticated with the ED80, and its obviously much harder to get a good sharp focus looking at a screen on the other side of the obs!
I think I need an assistant!
Anyway, the dispersion is encouraging
. Actually I think the 3.4 A/pixel is better than I calculated (estimating distances etc), I just need to work on focus, and maybe guiding for dimmer objects. If I can nail focus, I reckon I should achieve a resolution of low 20's A/pixel.
ATM I could always go back to the C8 if I want to...
Unfortunately, I can't achieve focus at this sort of dispersion with either the C8 or C11
. The extra aperture would be nice!
Al.