I enjoy taking close-up photographs of flowers. I use a Nikkor 70 - 210 AF which with the Nikon crop factor of 1.5 changes the lens to effective range of 105 - 315. I have a Nikon 5t and 6t screw lenses to focus closer. Amazon.com currently lists the 5t and 6t as currently unavailable. It seems there must be a backorder for both the Nikon and Cannon close-up lenses.