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Hi Jack,
The only thing you're missing is a recent edition of Tektronix' obligatory document "ABC of Probes", downloadable from e..g. <>.
Yes, a probe presents quite a load at high frequencies and it depends on the signal source whether that is a problem.
Where source impedance can be controlled, a low-Z probe (usually 50 Ohm impedance) is preferable.
It's all in ABC of Probes.

Raymond