This website use cookies and similar technology to customize the user experience perform aggregate analysis of how visitors experience the site, acquire aggregate demographic data on visitors, and provide other services to enhance the user experience. Please read our privacy policy to learn how this information is collected, used, and how you can control it. By clicking the "Accept" button you accept the use of these technologies.
Paracorr
Paracorr Type-2 (dis... Paracorr Type-2 (disassembled view)

Concept: I have built Newtonian reflectors since my high school days and still enjoy observing with Dobsonians. Knowing how the Nagler eyepiece complemented fast Dobsonians and Newtonians by removing eyepiece induced astigmatism, I now became intolerant of the inherent defect of coma in a parabolic mirror.

Paracorr — more stars, sharper stars, more time to observe.

In 1989 I decided to try to achieve the same field quality for parabolas as reached by my Nagler eyepiece and 4-element refractor designs. Existing coma correctors seemed to be limited in color correction, spherical aberration and convenience in use. Paracorr (parabola corrector) is completely color-free, center and edge, and installs like a Barlow. In 2009, we decided to greatly improve the correction with the Paracorr Type-2 design (followed by 3" BIG Paracorr Type-2 in 2014) so that new, large, Dobs as fast as f/3 could become practical. Ladderless Dobs with larger fields herald a revolution. Read the reviews and story, The New Dobsonian Revolution, in Astronomy magazine. The new Paracorr Type-2 is a combination visual and imaging system designed by Paul Dellechiaie and our staff. Let the revolution begin. — Al Nagler

Related Links

Ladderless Dobs with larger fields herald a revolution. Read the reviews and story, The New Dobsonian Revolution, in Astronomy magazine.

2" Paracorr Type 2 Instructions 3" BIG Paracorr Type 2 Instructions

Chart (JPG): Spot Size Graphs