Finder Group Eyecup 1 & Dioptric Correction Lenses 1
| Summary | Main Characteristics | Notes - Related Units |
| The Eyecup 1 prevents glare and loss of contrast caused by stray light
hitting the viewfinder eyepiece and accepts any of the eight Dioptric Correction Lenses 1. The Dioptric Correction Lenses 1 are available for adjustment of individual eye acuity. |
The Eyecup 1 is indispensable to prevent stray light passing through the
viewfinder eyepiece during manual exposures. The eyeshade is detachable from the inner socket of the Eyecup for mounting a Dioptric Correction Lens. The photographer can observe a clear viewfinder image when he inserts the optimum Dioptric Correction Lens into the inner socket of the Eyecup. The eight Dioptric Correction Lenses available include +2, +1, 0 diopters for long sight and -1, -2, -3, -4 and -5 for short sight. |
The Eyecoupler is essential when the 250 Film Back 1 and Eyecup 1 are used
together. The number engraved on each Dioptric Correction Lens indicates the final diopter in conjunction with the OM body. |
| Number engraved on Dioptric Correction Lens (final diopter in comjunction with OM body) |
Initial diopter of each Dioptric Correction Lens | Application |
| +2 | +4 | Hyperopes & presbyopes (or those who wear glasses of visual acuity from +4 to +2 diopter or glasses of focal length from +10 to +20 in.) |
| +1 | +3 | |
| 0 | +2 | |
| -1 | +1 | Slight myopes (with glasses of from +1 to -1 diopter or +40 to -40 in.) |
| -2 | 0 | |
| -3 | -1 | |
| -4 | -2 | Medium myopes (with glasses of from -2 to -3 diopter or -20 to -15 in.) |
| -5 | -3 |