Developed in 2010, the Tele Vue Paracorr Type 2 can make an f/3 mirror act like an f/12 without a Paracorr. Essentially diffraction-limited across the field, it makes the new breed of f/3-f/4 ladder-less Dobs possible, and superior in terms of convenience, field-of-view and optical perfection when using top quality mirrors. TeleVue has made many refinements to enhance it’s performance, for both visual use and imaging. By eliminating the effects of mirror-induced coma, “fast” scopes could be made as aberration-free as “slow” scopes. TeleVue showed that f/4 scopes equipped with the Paracorr rivaled non-corrected f/8 scopes. Shorter, more compact Dobsonians with dramatically larger fields became much more practical.
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