Telescope-Reducers & Correctors-Apertura Photographic Reducing Coma Corrector (PRCC)

Triplet Optical Design for Peak Coma Correction
Coma is the presentation of unfocused, comet-like stars around the edges of the frame. This aberration is an intrinsic property of imaging Newtonians that house parabolic mirrors, and must be corrected with an external optical system. Understanding this, the team at Apertura developed the PRCC with three correcting lenses to bring stars across the entire field of view into sharp focus, even at the far edges of the frame! Doubling as a 0.95x reducer as well, the focal ratio of the CarbonStar is brought from f/4 to f/3.8, allowing you to collect up to 10% more signal in each frame. Its 28mm image circle supports APS-C sized sensors, making it the perfect match for a wide range of cameras.

Heightened Field Illumination
As standard with almost every optical system, the issue of vignetting results in signal loss around the edges of the frame and reduces overall field illumination (the percentage of total light collected). Post-process calibration flat frames help compensate for this uneven illumination, though reducing vignetting and collecting more signal while imaging is optimal. With this in mind, the Apertura Photographic Reducing Coma Corrector was engineered to help correct vignetting right from the get go, boosting the overall light gathered for the best possible astroimages! The graph to the left shows the greatly improved field illumination of a 6” f/4 Newtonian while using this Apertura PRCC.

Expert Build Quality
Comprised of anodized aluminum, premium glass, and nylon, this Apertura Photographic Reducing Coma corrector was designed with the utmost quality. The telescope side of this coma corrector features M48 threads for seamless addition of your favorite 2” mounted filters. Simply thread on the filter, the reinsert this PRCC into the CarbonStar 150! Also, M48 threads can be found on the camera side, and features an industry standard 55mm of back focal distance for effortless addition of your camera with the correct user-supplied spacers. Weighing in at only 9.3oz, a height of 81mm, and a width of 50.75mm, this compact Apertura PRCC adds very little bulk to your set up. The included 2” push on dust cover and M48 aluminum threaded dust cover protect the optics when not in use.

Comes with the Apertura Absolute Warranty
The Apertura Absolute Warranty provides two years of coverage against product defects. After the initial two-year warranty expires, this product qualifies for Apertura’s Three-Year Accident Replacement Program. In addition, the Apertura Absolute Warranty is transferrable! Download a copy of the Apertura Absolute Warranty for more information on this program, how to make a claim, and why it is important to keep your original receipt and the product’s original boxes and packaging!