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A Telrad will put an object into the field of view of a low power eyepiece, but that's not your problem.
How are you going to find and centre in your eyepiece objects that can't
be seen with the naked eye? Unless you plan to stick to very bright
targets, the light gathering power of a finder is essential. With the light gathering power of your 12.5" you will need at least a 50mm finder.
Nothing to stop you having a Telrad [or similar] as well.
raymo
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