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NGC214 Corrector / Reducer

#19472 - NGC214 Corrector / Reducer for Classic C-14

Optec's NGC214 Next Generation Corrector is a 2-inch diameter optical telecompressor and coma corrector for the classic C-14 Schmidt-Cassegrain Telescope. 

Designed specifically for the classic Celestron and Meade SCT's, the NGC214 provides a magnification of 0.75X when

 an incredible f/3.3 effective focal ratio (EFL) on native f/10 systems. When used with an f/11 classic C-14, the NGM will yield an EFL of f/3.7. Results may vary slightly depending upon the imaging train configuration.  Best results will be obtained when used with the TCF-S Temperature Compensating Focuser.

User Images
Bob Benamati's NGC5907 image

Photo used with permission - Image © Bob Benamati

Bob Benamati captured this image of the edge-on galaxy NGC5907 using the NextGEN MAXfield 0.33X with a classic Celestron C-11 SCT mounted on a Losmandy G11.  A TCF-S focuser was used with the C11 to find perfect focus.

Optical Design

The optical design of the NextGEN 0.33X was performed using Zemax and optimized for four field points using wavelengths of 450, 550 and 650 nm.  The goal was for the smallest blur diameters for the four field points. The system was modeled using the actual optical prescription for a SCT with the inherit aberrations of this telescope. The resulting lens curvatures of this designed were made without adjusting the radii to the optical lab's tool list. Custom tools were made for all surfaces.  The Zemax results are shown below:

  • Click here to see spot diagram
  • Click here to see encircled energy diagram
  • Click here to see ray trace diagram
  • Click here to see field curvature diagram

Telescope-Side Compatibility:

  • TCF-S focuser,
  • Any 2-inch focuser or receiver.

Camera-Side Compatibility:

  • STL threaded camera-specific mount.
How to Order:

Contact any Optec dealer, call Toll-Free 1-888-488-0381, email, or visit our ecommerce site: optecinc.us.

Additional Information:

Historical Perspective