SharpStar MPCC Full Frame Coma Corrector

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Corrects coma in Newtonian reflectors from 150mm to 600mm aperture Optimized for fast focal ratios from f/3 to f/6 Provides a 44mm image circle for full-frame sensors Maintains nat ive focal length with a 1.0x reduction factor Standard 55mm back focus simplifies camera connection Features a 4-element quadruplet optical design Description FAQ Specifications In the Box Downloads Warranty SharpStar MPCC Full Frame Coma Corrector The SharpStar MPCC Full Frame Coma Corrector is engineered to eliminate coma in fast Newtonian reflectors, transforming them into flat-field astrographs. Its advanced quadruplet optical design delivers pinpoint stars across a full-frame 44mm image circle, supporting sensors in everything from 150mm to 600mm aperture telescopes. With a 1.0x magnification factor, this corrector maintains your telescope's native focal length and image scale, while the industry-standard 55mm back focus and 2" barrel ensure seamless integration into your imaging train. Quadruplet Correction for f/3 to f/6 Newtonians This corrector utilizes a four-element, air-spaced optical layout that includes an extra-low dispersion (ED) glass element. This sophisticated design provides a high degree of aberration control, effectively neutralizing the coma inherent in parabolic mirrors, especially those with aggressive focal ratios from f/3 to f/6. The result is a flat, sharp field from edge to edge, allowing you to use the full resolving power of your instrument. A 44mm Image Circle and 55mm Back Focus Designed specifically for modern astrophotography, the SharpStar MPCC illuminates a 44mm image circle, fully covering full-frame (36x24mm) DSLR and dedicated CMOS/CCD cameras without vignetting. Full-surface multi-layer coatings maximize light transmission for brighter images and higher contrast. The corrector features a standard 55mm back focus, measured from the unit's flange, which perfectly matches the spacing required by a DSLR with a standard T-ring, simplifying setup and ensuring optimal correction. A Standard 2" Barrel and 0.35kg Weight Mechanically, the corrector is built for broad compatibility and minimal impact on your setup. It slides into any standard 2" (50.8mm) focuser and, at a weight of only 0.35kg, it avoids placing excessive strain on the drawtube or upsetting the telescope's balance. Its total length of 118.7mm is compact enough for most focusers to accommodate without running out of in-travel. SharpStar 1.0x MPCC vs. 0.95x Corrector: Native Scale or Wider Field? SharpStar offers two excellent coma correctors, and the choice depends entirely on your imaging goals. The 0.95x version provides a slight focal reduction, which makes your telescope faster and captures a wider field of view—ideal for large nebulae. This 1.0x MPCC, in contrast, preserves the telescope's native focal length. This is the better choice when you want to maintain the maximum image scale for resolving details in smaller galaxies, planetary nebulae, or globular clusters. What telescopes are compatible with the SharpStar MPCC Full Frame Coma Corrector? This coma corrector is designed for paraboloid Newtonian reflectors with apertures ranging from 150mm to 600mm and fast focal ratios between f/3 and f/6. It is not suitable for refractors, SCTs, or other telescope designs. How do I achieve the required 55mm back focus with the SharpStar MPCC? The 55mm back focus is the industry standard for many imaging systems. A typical DSLR camera with a T-ring has a sensor distance of 55mm. For dedicated astronomy cameras, you will need to use a combination of extension tubes to achieve the precise 55mm distance from the corrector's rear flange to your camera's sensor. Will the SharpStar MPCC fully illuminate my full-frame camera on a 10" f/4 Newtonian imaging the North American Nebula (NGC 7000)? Yes. The corrector's 44mm image circle is specifically designed to cover full-frame sensors (which have a ~43mm diagonal) without vignetting. On an f/4 system imaging a large target like the North American Nebula (NGC 7000), you can expect a flat, evenly illuminated field with sharp stars across the entire frame. Should I get this 1.0x SharpStar MPCC or the 0.95x version? Choose based on your primary imaging targets: 1.0x MPCC (this model): Best for maintaining your telescope's native image scale. Ideal for smaller targets like the Whirlpool Galaxy (M51) or the Ring Nebula (M57) where you want maximum resolution. 0.95x Corrector: Best for maximizing your field of view and increasing the speed of your optical system. Ideal for very large targets or mosaics. Can I use the SharpStar MPCC for visual observing with my 12" f/5 Dobsonian? While it is optimized for imaging, the corrector will work for visual use and will provide noticeably sharper stars at the edge of the field in a low-power, wide-field eyepiece. However, its primary function is astrophotography. You must also ensure your focuser has enough in-travel to accommodate the corrector's 118.7mm length. What is the advantage of a 'Quadruplet' design in the SharpStar MPCC? A quadruplet (4-element) design allows for a higher degree of optical correction than simpler two-element correctors. By using four lenses, including an ED glass element, the SharpStar MPCC can better control coma and other off-axis aberrations across a wide 44mm field, especially in very fast f/3 or f/4 Newtonians. Application 150mm - 600mm Paraboloid Reflectors Focal Ratio Range f/3 - f/6 Magnification / Reduction Factor 1.0x Optical Design Quadruplet (4-Element) Image Circle 44mm Coatings Full-surface multi-layer Back Focus 55mm Barrel Diameter 2" (50.8mm) Overall Length 118.7mm Weight 0.35kg Download Software SharpStar/Askar 1-Year Warranty Show more