Telecentric Lens Systems
Telecentric lens systems from BelOptik extend the primary focal length of the telescope similar as a Barlow lens and collimating the beam path simultaneously. They can be used to raise the necessary aperture ratio of F/30 for H-alpha filter systems. In addition, I can note the back focus in production for the necessary light path of a binoviewer.
Usual extension factor are
2x, 3x, 4x, ...
Other sizes such as example 2.5x or 3.8x or 5x are possible
Design and manufacturing on request.
Price is 420,-EUR with T2 male thread and up to 38mm free aperture
Price is 495,-EUR with SC male thread and up to 46mm free aperture
Price is 750,-EUR with additional coma correction for solar Newton systems