John Russell
Well-known member
I want to attach 2" eyepieces. ALot of good eps sold on 2nd hand market are 2", however i suppose the problem is finding a 2" erecting prism.? They seem to be rare or very expensive.
Are you suggesting i would see no differnce in image qualityby `upgrading` to 2" over 1.25 ? I thought 2" eps gathered more light....
The amount of light gathered by a scope is dependant on the size of the objective, not the eyepiece.
Your scope has a 1,6" focusser - not sure if this is internal or external diameter but in any event <2".
2" eyepieces need a clear aperture of 2" so to make use of them you would need a larger focusser. If this change is mechanically possible it would be expensive and would only make sense if you wanted magnifications of less than 16x.
Large aperture scopes have correspondingly long focal lengths and so to get low magnifications one needs long focal length eyepieces. To offer a wide AFOV these need a large field stop, hence 2" eyepiece barrel diameters or even 3" for observatory telescopes.
See this link: http://www.televue.com/engine/TV3_Page.asp?return=Advice&id=79
John
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