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NextGEN WideField 0.50X

#17406 - NextGen WideField NGW 0.50X Telecompressor Lens

The NGW WideField 0.5X has been specifically designed to speed up the focal ratios of the popular f/10 Schmidt-Cassegrain telescopes distributed by Celestron and Meade. It will bring the focal ratio down to a solid f/5, perfect for imaging objects  like bright nebulae that require long exposure times. Because the WideField is optimized for the Schmidt-Cassegrain design, it is also excellent at correcting the optical problems like spherical chromatism and optical curvature that are common in these telescopes.

CCD camera users should note that the NGW reduces the image plane field size to at most 17.5 mm, so this optic will work best with cameras of this chip size or smaller.

User Images

Photo used with permission - Image © Sidney Scott Sober

These images of M27, M42, and M57 come courtesy of Sidney Scott Sober, who used a NextGEN WideField 0.50X with a Celestron C-11 telescope mounted on a Software Bisque Paramount ME. The images were captured with an SBIG ST-10XME with KAF 3200 Class 2 CCD. A TCF-S focuser was used with the C11 to find perfect focus, and an IFW filter wheel was used to acquire the colored images for these stacks.

Optical Design

The optical design of the NextGEN 0.50X was done with 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 inherent 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:

Telescope-Side Compatibility:

Camera-Side Compatibility:

Additional Views And Information

Other images taken by Sidney Scott Sober can be seen here and here.

This image of the M13 globular cluster was taken by Paul Howell, using the NextGEN WideField 0.50X with a Celestron C14 SCT f/11 OTA mounted on a Software Bisque Paramount ME. The image was captured with an SBIG ST-10XE with KAF-3200E Class 2 CCD and IFW Filter Wheel.

This image of the face-on spiral galaxy NGC2997 was taken by Michael Sidonio, who used a NextGEN WideField 0.50X on a 12" Meade LX200GPS. The image was captured with an SXV-H9 with attached True Tech Narrow filter wheel.