|Brand and Model:||Lumicon Coma Corrector/Field Flattener|
|Description:||The Lumicon Coma Corrector/Field Flattener Lens dramatically reduces coma (flared star images) and flattens the field when used, in particular, with f/3.5 to f/6 Newtonian telescopes. It is excellent for photographic use with 35mm and medium-format film up to 6 x 6 cm. |
The Lumicon Coma Corrector Lens is an afocal, or 'zero-power' air-spaced doublet lens system and is fully multi-coated on all 4 surfaces to eliminate ghost images. The aluminum cell’s, 48mm (2”) threads can be used on all 48mm threaded accessories.
Optimal performance of the Lumicon Coma Corrector is achieved when the center of the last optical element is 3.8” (96.52mm) from the film plane.
The Coma Corrector lens is automatically positioned correctly when threaded directly into the 2” barrel of the Lumicon 2” Newtonian Easy-GuiderTM.
By reducing coma and flattening the field, the Lumicon Coma Corrector makes off-axis star images are much smaller on your photographic and CCD star images. The Lumicon Coma Corrector also shrinks the size and improves the quality of off-axis guide stars, making guiding much easier. Because of the zero-power lens design, the Lumicon Coma Corrector has no color aberration and neither shrinks nor magnifies the image. There is no shift in focus after lens insertion.
The Lumicon Coma Corrector Lens would have minimal performance gain at high visual magnifications with well-corrected, modern design eyepiece.However, the Lumicon Coma Corrector Lens will certainly benefit and improve medium and low power observing with any 20mm to 56mm eyepiece. Wide apparent field eyepieces like the TeleVue Naglers and Panoptics are recommended for use with the Lumicon Coma Corrector since they are designed for a flat field. You will need a 2” diameter, 3” long extension tube and/or a 2”-1.25” reducer bushing to use both 2” and 1.25” eyepieces.