ASA - 0.72X 4" Cassegrain Reducer Corrector

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The ASA 4" 0.72X Cassegrain Reducer Corrector will enhance your pictures from your Cassegrain telescope, by getting rid of coma and field curvature problems!

SKU: ASA-4CAKORRR
Manufactured by:
ASA - Astrosysteme Austria
 

Product Description

ASA 0.72X 4" Cassegrain Reducer Corrector

 

 

The ASA 4" 0.72X Cassegrain Reducer Corrector will enhance your pictures from your Cassegrain telescope, by getting rid of coma and field curvature problems! This corrector lens is intended for use on classical Cassegrain telescopes having an opening of 0.4meter (15.75") or bigger, and a f/number of f/8 or slower.

This Reducer Corrector gives a 4" aperture and it's advanced for full-format CCD arrays up to 36.8mm x 36.8mm (Kodak KAF-16803 CCD). This corrector can be utilized with detector arrays requiring fairly larger circular coverage, however one would expect some minor loss of performance, and some vignetting at the edges. 

Without a decent corrector, any established Cassegrain telescope will demonstrate significant focal plane errors. This lens is advanced for a bandwidth of 400nm to >700nm, and each lens utilized as a part of the corrector is measured to confirm its surface radius and thickness, before it is utilized as a part of an ASA corrector system. The outcomes are pinpoint stars from the side all the way into the center of the image.

The 4CAKORRR reducer lens will reduce the inherent focal length by a factor of 0.72X. This lens has a field coverage of 60mm, which will more than cover the entire array of a Kodak KAF-16803 CCD detector. The back focus of approx. 90mm is sufficient to allow for using an off-axis guider or filter wheel with your detector system. Designed by ASA physicist Philipp Keller.

Specifications

Name ASA - 0.72X 4" Cassegrain Reducer Corrector
Manufacturer ASA - Astrosysteme Austria
Model ASA-4CAKORRR

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