Mark,
I also have a 12" SW Dob. Be careful of exit pupil size. You will probably find the 35 mm not suited to your scope. Check out TV web site for more info. My low power is the 27 TV pan, this eyepiece certainly has the wow factor. But in my 12" it only has 56 x mag, and you won't see too many deep space objects at that power. Best if you can try out an eyepiece before buying.
Good luck
Rod
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