
384 15. Plane Grating Spectrometers
Table 15.3
Optical Parameters of Hectospec"
300 fibers, 250 |im core diameter, 0.5 mm spacing
collimator diameter di 260 mm
camera focal length^ 400mm
camera-collimator angle 35°
pixel size 13.5 |im
/2//i =
1/3.25
r/2//i =
1/3.45
" Hectospec is a moderate-resolution fiber-fed spectro-
meter on the modified 6.5-m MMT of
the
Smithsonian
Astrophysical Observatory.
Of the several grating configurations of Hectospec, we choose the one with a
270 groove/mm grating and a blaze angle 5 = 5.3°. To simplify our exercise we
choose Eq. (15.2.2) rather than the more accurate Eq. (15.2.1); for this grating the
error mad ...