[ATM] Eyepieces

[jabris@comcast.net]

Bob,

Have you had any experience with the TMB eyepieces being sold by the manufacturer of TMB Refractors

Jack Brisbin

-------------- Original message -------------- 
From: "Bob May" <bobmay at nethere.com> 

> You're right in that the UO Koniegs are an excellent EP. Their 
> downsides are that they have a short eye relief isn't that great 
> so any under about 9 mm are pretty much useless. I'd get a good 
> barlow, 9mm ortho, 15mm Konieg, 25mm Konieg for a nice set of 
> EPs. My experiments with a set of 18mm EPs of the various 
> designs has shown the Konieg is usually the first choice, the 
> Erfle is the second choice, the Ortho is third, either the 
> Kellner or the Plossl is fourth. Always sitting at the bottom of 
> the pile is the lowly Ramsden. Sometimes the Erfle is on top but 
> that often happens with those that use eyeglasses as they have a 
> good eye relief that the Koniegs don't have. 
> Note that the size selection provides for a 4.5, 7.5, 9, 12.5 15, 
> 25mm sizes when you include the barlow in the mix. Thus, for 4 
> pieces, you get a lot more selections of focal length and the 
> bonus is that the shorter FL combinatons have the longer eye 
> relief of the EP that is being used with the barlow. 
> Bob May 
> bobmay at nethere.com 
> http: slash /nav.to slash bobmay 
> http: slash /bobmay dot astronomy.net 
> Replace the obvious words with the proper character. 
> 
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