不同放大倍数摄影目镜的 Field Number:
NFK | 1.67× 125 | 2.5× LD 125 | 3.3× LD 125 | 5× LD 125 | 6.7× LD 125 | Field number (FN) |
| 21.6 | 16.7 | 12.5 | 8.8 | Length | 74.5 mm | 63.8 mm | 56.1 mm | 51.5 mm | 44.0 mm | Length of top section | 19.0 mm | 17.8/18.3 mm | 18.5/18.7 mm | 19.0 mm | 19.0/19.1 mm | Diameter (top) | 24.8 mm | 24.8 mm | 24.8 mm | 24.8 mm | 24.8 mm | Diameter (body) | 23.1 mm | 23.1 mm | 23.1 mm | 23.1 mm | 23.1 mm | Weight | 68.6 gm | 49.3/49.6 gm | 40.5/40.3 gm | 43.3 gm | 36.2/36.3 gm | Microscope ref. | 2-LC898 | 2-LC894 | 2-LC895 | 2-LC896 | 2-LC897 | US catalog no. |
| 105-060 | 105-061 | 105-062 | 105-063 | Film or sensor format | APS-C, Four Thirds, video or 16 mm cine | 35 mm (24×36 mm) | Polaroid Type 100 (3¼″×4¼″) | Large format | Large format | Magnification relative to 1.67× | 1× | 1.5× | 2× | 3× | 4× | Magnification relative to 2.5× | 0.67× | 1× | 1.33× | 2× | 2.67× | The NFK 1.67× photo eyepiece works well with digital SLRs that use an APS-C sensor (22.2×14.8 mm), such as the Canon EOS 7D, 50D or 550D. With this combination the rectangular camera image (FN 15.3) fits inside the circular field of view of the WHK 10×/20 L viewing eyepieces (FN 20).
The NFK 1.67× is also the best available match for a Four Thirds sensor (17.3×13 mm), but the camera’s field of view (FN 12.3) is significantly smaller than the viewing eyepieces. The NFK 1.67× does not cover the full frame of 35 mm film, because it was designed for use with video cameras with a 2/3″ sensor (11 mm diagonal) and the MTV-3 C-mount adapter. The NFK 1.67× is too long to be used with the SZ-PT phototube on an SZ-4045 and similar stereo microscopes.
The NFK 2.5× photo eyepiece was intended for use with 35 mm cameras (36×24 mm); with this combination the rectangular camera image (FN 17.3) fits just inside the circular field of view of the WHK 10×/20 L viewing eyepieces (FN 20). The NFK 2.5× photo eyepiece is also a good match for a full-frame digital SLR such as the Canon EOS 5D Mark II and Mark III. The NFK 2.5× photo eyepiece is also used with video cameras with a 1″ sensor (16 mm diagonal) and the MTV-3 C-mount adapter.
Camera image areas with Olympus NFK LD photo eyepieces, relative to WHK 10×/20 L viewing eyepieces
|