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 min. 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 from 550 EUR with SC male thread and up to 46mm free aperture
Price from 890 EUR with additional coma correction for solar Newton systems