I think the Tele Lens ads 2x more magnification. So the built in Tele Lens will be magnified 4x I theory?
That being said I just watched a YouTube channel that says the sirui Brand version of the Tele Lens produces much higher quality pictures than the moment version and is compatible with the moment lens case.
I have the moment v2 wise lens which is great but went with the sirui Tele Lens.