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Wavy is correct. I use a 70mm f7 refractor as my finder on my only working scope ATM and thats a 150mm f8 refractor. The 70mm gives a very nice 2.5º sky with a 1.25" 20mm 70º eyepiece. I was after an exit pupil under 3mm to keep the sky nice and dark...could go wider than 2.5º but not much use for my preferences in the city. The biggest 2" eyepiece I have is a 100º ES 20mm that is very nice in the f8 refractor but only about half the same TFOV as the 70mm frac.
If you want wide get a small fast refractor. The f7 will eventualy end up on the 10" Newt as a super finder/ wide field scope.
Matt
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