Hi Matt
The 102 SLT sounds like it might suit your father. No tweaking needed, as you would need to do with a reflector (collimation). Nice and compact. Easy to view through. Computerised GOTO. Should make using it a breeze. I have no direct experience of it, however. Go into Bintel and have a good talk to the guys, explain the situation and see what they recommend. Don't worry about a barlow lens now, in fact it may not be used very much even if you had one. Instead, perhaps one or two better quality 1.25" eyepieces later on?
Let us know how it goes
Eric
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