Alpine Astronomical Baader SunDancer II Telecentric System TZ-3S

This achromatic Baader SunDancer II Telecentric System TZ-3S from Alpine Astronomical is designed for the entire visible spectrum and can therefore not only be used on H-alpha systems, but also replace a Barlow lens. While the magnification factor of a Barlow lens changes with its distance from an eyepiece or camera (zoom eyepieces are also based on this principle), the magnification factor and image quality of the TZ-3 do not change, even if the new focal point deviates very significantly from the working distance of the optical design (65mm).