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ความคิดเห็นที่ 8 |
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55mm f/3.5 schematic diagram.
Name: Nikon calls this the Nikon Micro-NIKKOR AI 55mm f/3.5.
Optics: 5 elements in 4 groups. Conventional spherical design, no floating elements. Newer ones are multicoated.
Optimum Reproduction Ratio: 1:10, which is at 2.4 feet or 0.7 meters.
Close Focus: 9.5" (0.241 meters).
Maximum Reproduction Ratio: 1:2. You get between 1:2 and 1:1 with either the PK-3 or PK-13 ring.
Hard Infinity Focus Stop? Yes. This is great for astronomy; just turn to the stop and you have fixed laboratory-perfect focus all night.
Focus Scale: Yes.
Depth-of-Field Scale: Yes.
Infra-Red Focus Index: Yes: red dot near depth-of-field scale.
Diaphragm: 6 straight blades. Stops down to f/32.
Aperture Ring: Yes, full-stop clicks.
Filter Thread: 52mm, metal Does not rotate.
Size: Nikon specifies 2.1" (53.5mm) extension from flange (2.54" or 64.5mm overall) by 2.6" (66mm) diameter.
Weight: 8.495 oz. (240.8g), measured (AI version), Nikon specifies 8.64 oz. (245g).
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ktt116   
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26 ก.พ. 53 15:02:08
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