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Hi Nick
Here is a bit of light reading for you off the Bintel site. Alot of very useful information there. If you go to their site and click on the eye piece link at the top of the home page, as opposed to the retail section on the left hand side you will find more information about eye relief etc.
"HIGH-POWER VIEWING
Once you’ve selected an eyepiece set based on field stop sizes, calculate the magnifications produced with your scope. For planetary or double star observing, you’ll want an eyepiece in at least the 150x range. For determining maximum power, a good rule of thumb is to use no more than 60x per inch of aperture for scopes with apertures up to 6". Higher magnifications may still be pleasing but will not likely reveal any additional detail. Realistically, the atmosphere will usually limit your planetary observing to a maximum magnification of about 300x, no matter how large your telescope aperture.
Basically, you’ll be choosing low and medium power eyepieces by field stop increments to "frame" the subject, and high power eyepieces by magnification increments (based on your scope’s aperture), to reach the optimum contrast and resolution for viewing planets and double stars."
Hope this copy and paste helps answer your question.
Clear skies and wow you must have some dark skies out there too.
Wayne
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