Telecentric System TZ-4S for Baader Sundancer II

Telecentric System TZ-4S is designed to work for Baader Sundancer II H-alpha filter, replacing the original 3x telecentric barlow
This allows to use the SunDancer II H-alpha filter to work also on telescopes with f/7-f/8 focal ratio, delivering optimal focal ratio of about f/30. Please note: For this, the 12 mm 2 nm H-alpha blocking filter, which is pre-installed in the front of the TZ-3S, must be installed in the TZ-4S. This blocking filter is not available separately. The ideal working distance when using the SunDancer II is then 70 mm from the base of the T-2 thread of the SunDancer II H-alpha filter (instead of 65 mm with the original TZ-3S).

• Delivers a plane-parallel, achromatic beam of light with 36 mm clear aperture
• Designed especially for H-alpha and CaK subangstroem etalon filters
• Includes a ½" filter cell for the 2 nm block filter of the Baader SunDancer II H-alpha filter
• 12.5 mm (1/2") filter exchange tool included
• Can also be used in place of a Barlow lens, expands the telescope focal length by 4x
• BBAR (Broad-Band Anti-Reflection) coating
• Anti-reflective thread and blackened lens edges against reflections and for maximum contrast
• 1¼" and 2" nosepiece with 1¼" filter thread, T-2 thread on camera side