This is the PC-E NIKKOR 24mm f/3.5D ED lens, which was announced on January 29, 2008:
Download the Nikon 24mm f/3.5D PC-E Manual (PDF link).
Standard and optional accessories and add-ons
The filter thread size on the 24mm PC-E is 77mm, which means you’ll want to be looking at purchasing 77mm filters.
The following are standard accessories supplied in-the-box:
- 77 mm snap-on front lens cap LC-77
- Rear lens cap LF-1
- Bayonet hood HB-41
- Flexible lens pouch CL-1120
- Nikon-made 77mm screw-in filters: 77mm Circular Polarizer II, 77mm Soft Focus Filter and 77mm Filter NC (Neutral Color).
The full list of compatible accessories is available at Nikon USA and in the lens manual.
Official Nikon 24mm f/3.5D PC-E websites:
Nikon Lenses — Main page.