25mm
概要
25mmレンズをベローズに取り付けた時のワーキングディスタンス（理論値）を計算。
倍率とレンズからの距離（25mm）について
２５ｍｍの焦点距離をもつレンズはあまり見かけません。「LAOWA 25mm F2.8 2.5-5X ULTRA MACRO」ぐらいかな。
| 倍率 | レンズ前の距離(mm) | レンズ後の距離(mm) |
|---|---|---|
| 0.1 | 275.0 | 27.5 |
| 0.2 | 150.0 | 30.0 |
| 0.3 | 108.3 | 32.5 |
| 0.4 | 87.5 | 35.0 |
| 0.5 | 75.0 | 37.5 |
| 0.6 | 66.7 | 40.0 |
| 0.7 | 60.7 | 42.5 |
| 0.8 | 56.3 | 45.0 |
| 0.9 | 52.8 | 47.5 |
| 1.0 | 50.0 | 50.0 |
| 1.1 | 47.7 | 52.5 |
| 1.2 | 45.8 | 55.0 |
| 1.3 | 44.2 | 57.5 |
| 1.4 | 42.9 | 60.0 |
| 1.5 | 41.7 | 62.5 |
| 1.6 | 40.6 | 65.0 |
| 1.7 | 39.7 | 67.5 |
| 1.8 | 38.9 | 70.0 |
| 1.9 | 38.2 | 72.5 |
| 2.0 | 37.5 | 75.0 |
| 2.1 | 36.9 | 77.5 |
| 2.2 | 36.4 | 80.0 |
| 2.3 | 35.9 | 82.5 |
| 2.4 | 35.4 | 85.0 |
| 2.5 | 35.0 | 87.5 |
| 2.6 | 34.6 | 90.0 |
| 2.7 | 34.3 | 92.5 |
| 2.8 | 33.9 | 95.0 |
| 2.9 | 33.6 | 97.5 |
| 3.0 | 33.3 | 100.0 |
| 3.1 | 33.1 | 102.5 |
| 3.2 | 32.8 | 105.0 |
| 3.3 | 32.6 | 107.5 |
| 3.4 | 32.4 | 110.0 |
| 3.5 | 32.1 | 112.5 |
| 3.6 | 31.9 | 115.0 |
| 3.7 | 31.8 | 117.5 |
| 3.8 | 31.6 | 120.0 |
| 3.9 | 31.4 | 122.5 |
| 4.0 | 31.3 | 125.0 |
| 4.1 | 31.1 | 127.5 |
| 4.2 | 31.0 | 130.0 |
| 4.3 | 30.8 | 132.5 |
| 4.4 | 30.7 | 135.0 |
| 4.5 | 30.6 | 137.5 |
| 4.6 | 30.4 | 140.0 |
| 4.7 | 30.3 | 142.5 |
| 4.8 | 30.2 | 145.0 |
| 4.9 | 30.1 | 147.5 |
| 5.0 | 30.0 | 150.0 |
| 5.1 | 29.9 | 152.5 |
| 5.2 | 29.8 | 155.0 |
| 5.3 | 29.7 | 157.5 |
| 5.4 | 29.6 | 160.0 |
| 5.5 | 29.5 | 162.5 |
| 5.6 | 29.5 | 165.0 |
| 5.7 | 29.4 | 167.5 |
| 5.8 | 29.3 | 170.0 |
| 5.9 | 29.2 | 172.5 |
| 6.0 | 29.2 | 175.0 |
| 6.1 | 29.1 | 177.5 |
| 6.2 | 29.0 | 180.0 |
| 6.3 | 29.0 | 182.5 |
| 6.4 | 28.9 | 185.0 |
| 6.5 | 28.8 | 187.5 |
| 6.6 | 28.8 | 190.0 |
| 6.7 | 28.7 | 192.5 |
| 6.8 | 28.7 | 195.0 |
| 6.9 | 28.6 | 197.5 |
| 7.0 | 28.6 | 200.0 |
| 7.1 | 28.5 | 202.5 |
| 7.2 | 28.5 | 205.0 |
| 7.3 | 28.4 | 207.5 |
| 7.4 | 28.4 | 210.0 |
| 7.5 | 28.3 | 212.5 |
| 7.6 | 28.3 | 215.0 |
| 7.7 | 28.2 | 217.5 |
| 7.8 | 28.2 | 220.0 |
| 7.9 | 28.2 | 222.5 |
| 8.0 | 28.1 | 225.0 |
| 8.1 | 28.1 | 227.5 |
| 8.2 | 28.0 | 230.0 |
| 8.3 | 28.0 | 232.5 |
| 8.4 | 28.0 | 235.0 |
| 8.5 | 27.9 | 237.5 |
| 8.6 | 27.9 | 240.0 |
| 8.7 | 27.9 | 242.5 |
| 8.8 | 27.8 | 245.0 |
| 8.9 | 27.8 | 247.5 |
| 9.0 | 27.8 | 250.0 |
| 9.1 | 27.7 | 252.5 |
| 9.2 | 27.7 | 255.0 |
| 9.3 | 27.7 | 257.5 |
| 9.4 | 27.7 | 260.0 |
| 9.5 | 27.6 | 262.5 |
| 9.6 | 27.6 | 265.0 |
| 9.7 | 27.6 | 267.5 |
| 9.8 | 27.6 | 270.0 |
| 9.9 | 27.5 | 272.5 |
| 10.0 | 27.5 | 275.0 |