25mm 58 Degree Eyepiece Vs. 20mm 66 Degree Eyepiece

[refractordude]

Is there a big difference in these two eyepieces with a 120mm f/8 refractor. Would you own the two?

[John]

What are the brands / models of the eyepieces ?

 

[refractordude]

7 minutes ago, John said:

What are the brands / models of the eyepieces ?

 

25mm bst

20mm expanse 

[John]

I'd go for the 25mm BST. More field of view (slightly) and better corrected.

 

[Louis D]

The 20mm expanse has Konig or Erfle levels of correction at the edge, so not the best.

I have the 25mm Meade HD-60, and it isn't that well corrected at the edge of its 58 degree field, either.  Better than a Konig/Erfle, but not spectacular like a 24mm Panoptic.  Both are quite good on axis.