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Ro200
John,
Just to clarify...
The RO200 grating screws into an eyepiece similar to a conventional filter. There's also a cylinderical lens (in a holder) which can be used for visual work by fitting it over the end of the eyepiece.
This lens "broadens" the spectrum making it fainter but easier to see.
The cylinderical lens isn't required for imaging with the RO200; the RO200 grating can be fitted into the nosepiece of the camera/ webcam etc to give very good spectra.
Ken
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