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Not quite sure what people are talking about in saying that the 13mm Ethos is not suitable for an ETX 125, other than weight, which may put the GOTOs out a bit.
I use a 13mm T6 Nagler in mine regularly and it gives fantastic views at 146X, great for globs and the moon for example. It is exactly half the weight of the Ethos though. Also use the 9mm T6 Nagler for 211X power
Because it is F15 you could get away with using a cheaper wide field instead as the the light entering the eyepiece is very flat.
In the F5 12" dob the 13mm Nagler or Ethos would be much better corrected to the steeper cone of light, meaning that the stars would be much sharper at the edges of the field of view.
Cheap widefields in short focus dob are yuck!
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