Bought this lens for a Northern Lights photography tour in Iceland but didn’t take it with me in the end. It’s been taken out of the box and it’s metal case but never used. It’s a brilliant astrophotography lens but has many other uses, particularly city and landscapes. The Blackstone version is better quality than the Firefly. Reinforced full-metal construction. All lens markings are engraved and filled with a UV-reactive paint enabling easy focusing in dark environments. Included with the lens is a hard case. Has Built-In Chip for Nikon EF Digital SLR.