Star analyser (200 ln/mm)

Used like a conventional 1.25 inch filter, it is the ideal accessory for today's low cost astronomical imaging cameras, webcams and video cameras.

* For example, with a telescope of just 80mm aperture and a simple unmodified webcam, the hidden characteristics of hundreds of stars down to magnitude +4 can be revealed. With a 200mm aperture and a sensitive long exposure CCD imager, the identification of bright Novae and Supernovae or even a measurement of the expansion of the universe from the redshift of a Quasar are possible.

FEATURES:
* High quality transmission diffraction grating mounted in a standard 1.25 inch filter cell
* Anti- reflection coated glass protects the grating surface
* High efficiency 100 lines/mm blazed design
* Simple to use - Screws into a camera eyepiece adapter like a normal filter
* Spectrum direction marked on the filter cell. A locking ring maintains the orientation
* Optimised for the small CCD sensors found in popular webcams, video and astro cameras.
* Star and spectrum can be recorded in the same image, which aids identification and calibration
* Grating distance can be adjusted if desired using spacer rings (purchased separately)
* Can also be fitted to an eyepiece for visual use