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If you have a right angled, erect image finderscope, then you need a Telrad or some type of red dot finder.
With a straight through finder, I can often make do without a red dot finder when using a 6X30 finder, though I find it much tougher going trying to use a straight through 8X50 because of the narrower field.
I once met a sharp-eyed chap who only had a Telrad on his big dob - he said he didn't need a finderscope.
Also, for us people without as good a vision as that chap - one can put one barrel of a pair of binoculars behind the Telrad, and use that as a finderscope.
Regards,
Renato
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