PRODUCT DESCRIPTION 
Nikon calls this the NIKKOR-H•C 5cm f/2
NIKKOR is Nikon's trademark for its lenses.
H stands for "hex," meaning this lens has six elements.
C means coated, which was a competitive advantage for Nikon in the 1940s, but as all other brands of lenses were coated by 1957, Nikon dropped the C. 5cm means 50mm.
Optics: 6 elements in 3 groups. All are single-coated.
Diaphragm: 10 straight blades. Stops down to f/16.
Aperture Ring: Yes. Metal. Full-stop clicks, uneven spacing.
Close Focus (set on camera): 3 feet. 0.9 meters.
Hard Infinity Focus Stop? Yes, on camera.
This is great for astronomy; just turn to the stop and you have fixed laboratory-perfect focus all night.
Focus Scale / Depth-of-Field Scale: Yes, on camera.
Infra-Red Focus Index: Sort of: Nikon says to use the f/2.8 index on the camera's depth-of-field scale.
Other Nikon 50mm lenses need different indices, so Nikon couldn't make one mark that would apply to all of their f/2, f/1.4 and f/1.1 lenses.
Filter Thread: 40.5 x 0.5 mm, chromed brass. Rotates with focus. 0.5mm is a finer thread pitch than larger filters. Luckily, unlike with 43mm filters, today's 40.5mm filters still use this finer pitch, so any Hoya, B+W or Tiffen filter today should work perfectly.
Hood: Nikon 5cm f/2 hood. The all-metal, enameled conical hood attaches with Nikon's standard split spring-loaded, 40.5mm attachment. The markings are engraved and filled with paint.
Size: 1.567" (39.80mm) overall length by 1.850" (46.99mm) diameter, measured.
Weight: 4.715 oz. (133.7g), measured.
Different cosmetic versions may differ.
Introduced Fall 1946.
Made in Japan.
 
Product 
SN: **8457
Condition: Like New (LN)
Warranty: 2 weeks shop warranty, covering manufactural defects 
What You Will Get 
- Original Chrome Nikon 40.5mm Filter
- Original Nikon Metal Snap On Hood
 
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All products sold are NON-REFUNDABLE and NON-EXCHANGEABLE unless otherwise stated. All prices are also FIXED and we do not entertain any attempts to negotiate.
PM to check stock before coming down! 
 
Return and Refund Policy 
Strictly Non-Refundable nor Exchangeable. 
 
Proceed to the store during opening hours for purchase. 
Black Market Camera 
Peninsula Shopping Centre (NOT Peninsula Plaza) 
#03-30/31/32 
Opening hours: 12.30pm - 7.45pm daily 
Tel: 6336 6349 
Next to Funan Mall 
Nearest MRT: City Hall MRT