Telescope mount vs tele lens

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Interceptor121 Contributing Member • Posts: 982
Telescope mount vs tele lens

I am looking at William Optics telescope mounts 360mm f/5.9

On the other hand telephoto primes exist for MFT 300/4 or 420/5.6

What is the benefit other than cost (william optics are cheaper) of a telescope mount vs telelens at the same optical performance??? The telescope mounts look heavier

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