Tamron-F AF Teleconverter 2X N-AFd MC7 for Nikon F brand_Rokinon but it beats carrying around

but it beats carrying around a bunch of external viewfinders

The Nikon P900 is a superzoom camera with an actually super zoom: it has a 24-2000mm equivalent lens that is

you will need at least one more Pocketwizard device to trigger a camera or flash as described above

Probably not a surprise

Tamron-F AF Teleconverter 2X N-AFd MC7 for Nikon F brand_Rokinon but it beats carrying aroundThe Tamron F AF Teleconverter 2X N AFd MC7 for Nikon F is a 2x teleconverter that can double the focal length of a compatible lens, at the cost of two stops of light. Compatibility is pretty good: itll work with most lenses that dont have a protruding rear element. It even transmits pin drive AF function, which no Nikon branded teleconverter does. In very good condition, with minor cosmetic barrel wear, light internal dust.