Like a Barlow lens, a telecentric extends a telescope’s focal length. However, the telecentric generates a parallel optical beam. This is particularly important when using etalon filters for solar observation in H-alpha light.
The new Telecentric TZ-4S from Baader is perfect for use with the Sundancer II H-alpha filter. It replaces the integrated telecentric which has a 3x focal length extension. Thanks to the 4x focal length extension created by the TZ-4S, the ideal aperture ratio of f/30 is achieved, even with f/7 to f/8 optics.
The achromatic Telecentric TZ-4S is designed for the entire visible spectrum, and can therefore not only be used with H-alpha systems.
You can find more information here in our shop.
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