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Old 28-04-2008, 01:21 PM
Ian Robinson
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Is anyone using a Lumicon Coma Corrector connected to a Lumicon 2" Newt E-Guid ?

Is anyone out there using a Lumicon Coma Corrector connected to a Lumicon 2" Newtonian Easy Guider ?

I am interested in how the 0x Lumicon Coma Corrector fits into / or onto the telescope end of a Lumicon 2' Newtonian Easy Guider ?
Does the tune of the coma corrector disassemble to screw into the guider somehow ?

I presume the camera attaches to the other end of the Easy Guider by a T-ring.
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Old 05-05-2008, 02:10 PM
Ian Robinson
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No one ???

Found this : Lumicon Coma Corrector/Field Flattener


Brand and Model:
Lumicon Coma Corrector/Field Flattener
Type:
Coma Corrector
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.

Photographic Performance
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.

Visual Performance

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.


http://excelsis.com/1.0/entry.php?sectionid=28&entryid=54

and found someone who still has some and the measurements provided to me :
Length ........... 35.5mm
Inside Female Thread ............. 47.9mm
Outside Male Thread ............. 47.9mm
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