Diffraction grating filters: SA-100 vs RO-200

Rainbow Optics RO-200 provides more details in star spectra, more absorption lines are visible/detectable. Star Analyzer SA-100 is better for faint stars since generated spectrum is narrow. 

Examples of spectra for three bright stars (Capella, Menkalinan and Al Kab).

Afocal stellar spectroscopy setup

Afocal stellar spectroscopy with RO-200 and SA-100 grating filters, Celestron XLT 150 Newton telescope, and Lumix LX3 camera

Afocal setup with Lumix-LX3, extension adapters and Plossl 25mm:

Diffraction grating filters (RO-200 or SA-100) are attached to afocal setup through a set of eyepiece extension rings. Disassembled Barlow unit is used as major extension adapter:

Completely assembled unit (spectroscope grating filter + extension rings + Plossl 25 + camera adapter + photo camera) is inserted into telescope focuser (Celestron XLT 150 Newton). Barlow barrel allows to rotate grating filters independently from camera to adjust appropriate spectrum direction for drift style photography:

Examples of stellar spectra through SA-100 (Aldebaran and Castor):

Examples of stellar spectra through RO-200 (Vega, Sirius and Betelgeuse):

Aldebaran spectrum SA-100 vs RO-200:

Capella spectrum SA-100 vs RO-200:

Pleiades through SA-100:

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