Hello.. I am a beginner photographer, I'm shooting with a Nikon D5500. I just purchased a Rokinon ( lens)24mm T1.5 ED AS IF UMC (for Cinema) so I noticed that I can't change the aperture on my camera. The f stops show something like this f--
Any suggestions why this is happening? I have no problem with the aperture on my kit lens which is the Nikon DX AF-P NIKKOR 70-300mm
Thanks.