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Equipment Discussions >> Cats & Casses

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coutleef
Post Laureate
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Reged: 02/21/08

Loc: Saint-Donat, Québec, Canada
Re: Minimizing SCT vignetting while maximizing FOV... new [Re: bilgebay]
      #5819777 - 04/24/13 01:14 PM

I solved that problem by using a 2 inch WO diagonal for SCTs, not using a focal reducer and using a 40mm pentax XW for wider views. When i want to go wider withoutnvignetting, i use my 100 mm semiapo

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jrbarnett
Eyepiece Hooligan
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Reged: 02/28/06

Loc: Petaluma, CA
Re: Minimizing SCT vignetting while maximizing FOV... new [Re: Eddgie]
      #5820213 - 04/24/13 04:48 PM

Thanks Ed. I'll PM you in a sec for Ken's article.

In the meantime, any opinion on whether in (1.25" VB) + (1.25" diagonal) mode it makes a difference if the diagonal uses a prism rather than a mirror?

Thanks for taking the time to provide the well-thought-out, well-articulated analysis of the question.

Regards,

Jim


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Eddgie
Postmaster
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Reged: 02/01/06

Re: Minimizing SCT vignetting while maximizing FOV... [Re: jrbarnett]
      #5820509 - 04/24/13 07:03 PM

Just an opinion... The difference between the light paths of the the two types in 1.25 is not meaningful. Maybe not the case in 2" but I could not tell you for sure.

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