Eyepiece size

[drumsolo]

Could someone please explain the difference between 1.25" and 2" eyepieces apart from the difference in size! Are there benefits to using one size over the other?

Thanks in advance

[JimBobs63]

Hi,

I guess in a nutshell, all other things being equal, 2" eyepieces will give a wider Field of View for a given focal length (and therefore magnification) than the equivalent 1.25" eyepieces.

Of course, the 2" being larger has a lot more optically shaped and coated glass to the elements in them, and therefore they tend to be quite a bit more expensive...!

I'm sure others on the forum can give you much more detail on the pros and cons of 1.25" and 2" eyepieces than I...!

Best Wishes,

Jim

[Peter Drew]

2" fit eyepieces will give a wider field of view than 1.25" fit PROVIDED that the field stop of the 2" eyepiece is greater than the aperture through a 1.25" fitting. There are some wonderful eyepieces in the 2" fit range but the good ones are expensive.