Quote:
Originally Posted by sheeny
I got a bit of a tadpole tale to the star image but I captured the spectra anyway, then afterwards removed the SA and ST8i to check collimation which all looked pretty good... I need to track that down...  |
Hi Al,
The tadpole in the zero order is probably an effect of the wedge prism. (Instead of a nice round zero order image you get a little very low dispersion spectrum with a bit of comma as well thrown in) With careful focussing, the spectrum itself should be (a little bit) sharper though, particularly at the red end.
Re Vspec and fits, I have just posted some ideas on Ken's Yahoo group
Robin
(In a wet and miserable NW England
)