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I use a 17mm Ethos with my f/10 12inch Meade LX200, the views and contrast are spectacular, i especially like to use the 17mm Ethos with the autostar spiral search mode by pressing the goto a second time after it center's an object such as Eta Carinae or M42, the spiral search mode makes it feel like you are drifting automatically around the nebula.
I have noticed with the 17mm Ethos and the f/10 12inch Meade LX200 the seeing needs to be very good as the slightest haze in the atmosphere at this magnification is very noticeable, I have not yet tried the 21mm Ethos in my LX200 but i would like to know how it compares to the 17mm Ethos.
The eyepiece i use the most is 26mm Nagler as the contrast, field of view and magnification works extremely well for 90% of the deep space objects viewed.
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