I have bought a new Samyang 14mm f2.8 ED AS IF UMC lens for my Nikon D7000 dslr. I was trying to set the interval timer shooting to take a time-lapse but I couldn't see the option enabled. The date and time settings are enabled and I am using a SanDisk extreme 16gb memory card. I switched to my Nikon 70-300 lens and the interval timer shooting option got enabled. Please let me know if I am missing something or if the option doesn't get enabled for manual lenses.