FreeLists / az-observing / [AZ-Observing] Re: The Orion 120mm ED Refractor

[DBogan3220@xxxxxxx]

OK Crawling out of the woodwork again/ :-)  The color  fringing one may see 
can be caused by the eyepiece used. When I use my 9mm  Nagler on the moon with 
my AP 130 F6 I can have a yellow green ring around the  bright limb portions 
of the moon. When I used one of my Brandon's I would  get a purple ring very 
slight but still noticeable. Then when I switch over  to one of my Takahashi 
eyepieces either the 7mm LE or the 5mm LE I get a  perfectly sharp image with 
no 
ring. Same goes if I use my AP 10mm or the AP 6mm  eyepiece no ring at all. 
 
When I've looked through several different version of the Celestron 6 inch  
Achromat I have noticed tremendous amounts of purple on the limb of the bright  
portions of the moon plus purple smearing inside the dark portions of the  
craters of the moon. This Chinese Achro was the only Achromat I have observe  
this effect with. My 60mm Tasco and my 80mm Achromat Guide scope does not do  
this.
 
Clear Skies
Dwight L Bogan
 
 
 
 
In a message dated 8/8/2006 7:48:34 P.M. Pacific Standard Time,  
Telescoper@xxxxxxx writes:
I think  this may answer my next question of why is there a thin yellow 
fringe  
around the curve of the Moon but on the terminator I don't see any fringe.  I 
think that's right; I'd go check that, but now it's full!

Anyway  I thought refractor talk might bring you guys out of the woodwork. 
Thank  you everyone, Stan Dwight Brian Chaz Thomas Paul Roger (Dean) et al, 
for  
all the intelligent input here, you are an asset and a  treasure.

Jack







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