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Hi Meli,
Welcome to the Forum,
Some wise advice here,from Ving,and Mike,as allways,
High Power,Small aperture,is Almost useless,
The Golden rule,ABOUT 50x per inch of Aperture is the Maximum,
SO,525x in a 2 Inch Scope = about 100x,in the best conditions,possible,Very Rare.
Please take heed,and buy the biggest,that is Reasonably easy for your Dad to move around.
Sure,The biggest aperture,is best,no doubt about that,,BUT,if it is a Pain to move around,it will Not get used.
KEEP AWAY FROM EBAY,Unless,you really know what you are looking for,
AND,give some thought to Binoculars,for your Dad,
They are also a very good,often, UNDERRATED, tool for Astronomy.
IE,EVERYONE,Thinks, I need a telescope,to start off with.
A Reasonably Good Binocular,will provide many hours of enjoyment,not only for Astronomy,but Daytime viewing as well.
Please Read,some of the very good advice here,on "Ice In Space"
Regards.John
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