Coma Correctors

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Accessories / Visual and Everything Else / Coma Correctors
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Coma Correctors
In a reflecting telescope, coma makes stars at the edge of the field look like blurry comets whose tails point out radially from the center of the field. All parabolic mirrors used in Newtonian reflecting telescopes are limited in field sharpness due to coma. The faster your telescope's focal ratio, the worse the effect. Even a perfectly made 13" f/4.5 parabola has a diffraction limited field that’s only about 0.1° across.

Coma correctors are auxiliary lens systems that reduce the coma at the edges of the field to provide images that are sharp across the entire eyepiece or photographic field. You no longer have to constantly shift your scope to keep objects centered for sharp viewing.

The TeleVue coma correctors below can be used with any reflecting telescope and any eyepiece, although TeleVue eyepieces are recommended because of their excellent edge correction. The Vixen coma corrector is specific to the particular Vixen reflector listed.

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Astro-Tech photo-visual Coma Corrector and field flattener for fast focal ratio Newtonian reflectors
 
Astronomy Technologies - Astro-Tech photo-visual Coma Corrector and field flattener for fast focal ratio Newtonian reflectors 
Our Product #:  ATCC

Pre-Order: New product; you may order now and we will charge and ship when available, or you can call or e-mail us to be put on a waiting list at no charge as well.
The Astro-Tech Coma Corrector is a photo/visual auxiliary lens system that fits into the 2" focusers of all f/3.5 to f/6 Newtonian reflectors to drastically reduce coma and curvature of field in visual observing and astrophotography . . .

[ More details . . . ] 

$135.00



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Paracorr Photographic for SBIG STL-series CCD cameras
 
TeleVue - Paracorr Photographic for SBIG STL-series CCD cameras 
Our Product #:  PARASB
TeleVue #: PSB-1100

Special Order: Product is special order only; please call or e-mail for approximate delivery time. A 20% nonrefundable deposit is required when ordering.
The Paracorr STL-series Photographic is an auxiliary lens system for use with SBIG STL-series large format CCD cameras and f/3.5 to f/5 reflectors. It improves deep space images by dramatically reducing the coma and field curvature . . .

[ More details . . . ] 
$275.00
List Price: $355.00



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Paracorr Visual
 
TeleVue - Paracorr Visual 
Our Product #:  PARAVIS
TeleVue #: PVL-2008

Back-Ordered: Temporarily out of stock; will charge and ship when available.
The Paracorr (Parabola Corrector) Visual is an auxiliary lens system that fits into the 2" focusers of all carefully-collimated f/3.5 to f/5 Newtonian reflectors. It drastically reduces coma and curvature of field in visual observing . . .

[ More details . . . ] 
$330.00
List Price: $395.00



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