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Sounds interesting....
My 2c
The maximum magnification (usable) with this scope is roughly equal to the aperture in mm ie x130. Sure on "good" days and everything going right you could go higher but in my experience - not very often.
This would suggest a 7.5mm eyepiece.
I wouldn't bother with barlows with your student users....
A good 25-28mm eyepiece would give pleasant wide field views...
Re T adaptors. The SW eyepiece holder (at least on the ones I have) has an external T thread....this can be used to fit the T2 camera adaptor to the focuser. If not, then a 1.25" to T thread adaptor would be necessary.
You need to check the available focusing spacing between the top of the focuser body and the actual focus of the telescope.
You'll need at least 55mm to be able to fit and focus a DSLR.
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