Is the sd card the same one you have been using, or is it a new one? Has the lock on the sd card been activated? Have you formatted the card? 

( such as A Hasselblad or Mamiya 645 or Pentax) can be attached to this tripod. However, even though this is a great medium duty tripod, to put that amount weight on top might make it a little unstable. Now if you’re anchored on good solid ground, with little to no wind this tripod will most likely work well. Just don’t walk away if conditions are not optional. Have fun and enjoy your photo adventure. 

Your Nikon lenses will mount to the XT3. Adjust aperture with the adapter. Manually focus lens. 

yes, the filter size is 55mm and your Nikon D3400 AFP-DX 18-55mm lens size is 55mm, so the filte can fit your camere 

For heavy medium format lenses like telephoto lens, we suggest to use with a telephoto bracket and a tripod to balance its weight when shoot