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Iris Mount for 70mm Outer Diameter Irises, #53-921
可變光圈調整座適用於我們最受歡迎的可變光圈尺寸，並以耐用的黑色陽極電鍍鋁打造而成。這些調整座擁有多種不同的英製安裝立桿選項，皆具備隨附的固定螺釘以確保安裝穩固。
| Iris Diameter | A | B | C | D | E | F | G | H | Stock No. |
| 19.8 | 30.8 | 19.8 | 6.1 | 6.35 | 2.5 | 4-40 | 15.1 | 8-32 | #53-918 |
| 37.0 | 50.8 | 37.0 | 9.0 | 9.5 | 2.8 | 6-32 | 25.0 | ¼-20 | #53-919 |
| 53.0 | 66.0 | 53.0 | 9.9 | 9.5 | 3.0 | 6-32 | 32.7 | ¼-20 | #53-920 |
| 70.0 | 86.0 | 70.0 | 10.1 | 9.5 | 3.8 | 6-32 | 42.7 | ¼-20 | #53-921 |
| 21.0 | 32.0 | 21.0 | 6.2 | 9.5 | 3.2 | 4-40 | 15.7 | 8-32 | #54-862 |
| 38.0 | 52.0 | 38.0 | 9.1 | 9.5 | 3.2 | 6-32 | 25.6 | ¼-20 | #54-863 |
| 54.0 | 67.0 | 54.0 | 8.9 | 9.5 | 3.8 | 6-32 | 33.2 | ¼-20 | #54-864 |
| 72.0 | 88.0 | 72.0 | 10.3 | 11.5 | 3.8 | 6-32 | 43.7 | ¼-20 | #54-865 |
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