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Not sure on the maths Eric, but I know that the 13mm Ethos has the same true field of view as a 26mm plossl but double the magnification giving you alot more contrast and more detail in all objects. We tried this one night on some objects using my friend 13mm Ethos then switching back to his 25mm televue plossl and the difference was astounding.
Same size field but alot more detail and fainter detail was apparant because of the increased contrast.
The 17mm probally similar to 30 mm plossl at 50 degrees or maybe 68 degree piece.
The main advantage for this 100 degree eyepieces is you can run at high magnification without losing field of view.
I hope they release one around 26mm focal length this would make n excellent low power eyepiece.
According to a few guys on cloudy nights the 17mm was better than the 13mm in all scopes they tested it in from 12 to 18inch dobs and 9.25 to 12 inch SCT telescopes.
I will be using it in my f10 12 200R as well as using an Optec f7 reducer to get the scope down to F7 when I am not using the scope for imaging.
A few guys have tested all the Ethos range and found that they perform perfect with the televue 2 X powermates with no loss of field or quality.
They will eventually bring out other focal lengths after they make enough on each new release to stop people just buying a couple and using powermates to double up each usuable focal length.
I will post a report when I get it but should be good.
Regards Matt.
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