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Equipment Discussions >> Reflectors

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hungerford
sage


Reged: 08/23/08

Corrector new
      #5770109 - 04/01/13 03:31 AM

Hi,
I need to purchase a corrector for a GSO f4 10".At present I am using an MPCC positioned at exactly 55mm from the chip but I still get some coma around the stars.
So without breaking the bank which corrector would be the best fro this scope.
Thank you for your help.
Vince


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Jon Isaacs
Postmaster
*****

Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: Corrector [Re: hungerford]
      #5772178 - 04/02/13 05:31 AM

Quote:

Hi,
I need to purchase a corrector for a GSO f4 10".At present I am using an MPCC positioned at exactly 55mm from the chip but I still get some coma around the stars.
So without breaking the bank which corrector would be the best fro this scope.
Thank you for your help.
Vince




Vince:

I don't have much to offer except to ask if you have experimented with the actual spacing rather than going by the book?

Jon


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Sean Puett
Carpal Tunnel
*****

Reged: 09/06/10

Loc: always cloudy, washington
Re: Corrector new [Re: Jon Isaacs]
      #5775896 - 04/03/13 04:09 PM

What about an original paracorr?. You can get one for between $125-200. I have uses one on a scope sub f4 and could not visually detect any coma, even at low mag. I think it is worth a shot since you could sell it for the same price you bought it for if you don't like it.

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Starman1
Vendor (EyepiecesEtc.com)
*****

Reged: 06/24/03

Loc: Los Angeles
Re: Corrector new [Re: hungerford]
      #5776166 - 04/03/13 06:48 PM

Quote:

Hi,
I need to purchase a corrector for a GSO f4 10".At present I am using an MPCC positioned at exactly 55mm from the chip but I still get some coma around the stars.
So without breaking the bank which corrector would be the best fro this scope.
Thank you for your help.
Vince



"coma around the stars"?
Coma appears in photographs as a lengthening of the star images in a radial direction in which the brightest point of the star is at the inside edge of the streak, and it is linear--twice as long at twice the distance from center.

If what you are seeing is something else, then it may not be coma.
Can you describe more completely what you see?


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