smc PENTAX原廠XW10廣角XW目鏡(總代理公司貨)
smc PENTAX原廠XW10廣角XW目鏡(總代理公司貨)
PENTAX獨家SMC鍍膜
平坦度/明亮度世界第一
頂級天文目鏡
70 ° 廣角的視角，再加上耐候性機構
高品位的光學特殊的影像畫質
具有PENTAX著名的SMC(超級多層鍍膜)技術。當光線每一次通過空氣玻璃接觸面的時候，都會發生折射和反射。 通常情況是95%透射，5%反射，雖然只有5%，但是鏡頭是由多枚鏡片組成的，每片鏡片的兩次反射累加在一起的時候，最後到達底片的光就得大打折扣了，如果鏡片由10片構成，則最後只有36%左右的光到達底片或感應器。這時不只光強大大降低,反差和色彩還原也難以得到保證.為了增強透過率，PENTAX當年率先開發了SMC(Super-Multi Coating)技術，採用化學鍍膜法在鏡片上鍍上七層鍍膜，使得光線的透過率提高到96%。PENTAX於1971年開始應用SMC技術，在此以後凡是印有SMC字樣的PENTAX鏡頭，都是鍍過七層膜的。
高效能的X寬系列的光學吸收了高折射，特低色散玻璃鑭元素的產生，以及均衡的形象，以最少的畸變
鏡頭的各個介面部分，均擁有極佳的密封性特色，堅固的防雨防塵結構，即使在雨天或是風塵彌漫中都可以毫無擔憂。
| Model: 型號： | XW20 | XW14 | XW10 | XW7 |
| Focal Length: 焦距： | 20mm | 14mm | 10mm | 7mm |
|
Lens Construction
鏡頭結構 [Elements/Groups]: [元素/團體] ： |
6/4 | 7/6 | 7/6 | 8/6 |
| Apparent Angle of View: 明顯的視角： | 70° | 70° | 70° | 70° |
| Eye Relief: 眼救濟： | 20mm | 20mm | 20mm | 20mm |
| Sleeve Size: 套筒尺寸： | 31.7mm | 31.7mm | 31.7mm | 31.7mm |
| Length & Diameter [mm]: 長度及直徑[ mm ] ： | 86 x 61 | 97 x 61 | 110 x 61 | 120 x 61 |
| Weight [g]: 重量[克] ： | 355g | 365g | 390g | 390g |
smc PENTAX XW20 with Spotting Scope
| Product name | PENTAX PF-100ED | PENTAX PF-80EDA | PENTAX PF-80ED | PENTAX PF-65EDAII | PENTAX PF-65EDII |
| 倍率 | 32X | 27X | 26X | 19.5X | 19.5X |
| Real Field of View | 2.2° | 2.6° | 2.7° | 3.5° | 3.5° |
| Apparent Field of View | 70° | 70° | 70° | 70° | 70° |
| Field of View at 1000m | 38m | 45m | 47m | 61m | 61m |
| Exit Pupil | 3.1mm | 3.0mm | 3.1mm | 3.3mm | 3.3mm |
| Eye Relief | 20mm | 20mm | 20mm | 20mm | 20mm |
| Relative Brightness | 9.6 | 9.0 | 9.6 | 10.9 | 10.9 |
smc PENTAX XW14 with Spotting Scope
| Product name | PENTAX PF-100ED | PENTAX PF-80EDA | PENTAX PF-80ED | PENTAX PF-65EDAII | PENTAX PF-65EDII |
| 倍率 | 44X | 37X | 36X | 28X | 28X |
| Real Field of View | 1.6° | 1.9° | 2.0° | 2.5° | 2.5° |
| Apparent Field of View | 70° | 70° | 70° | 70° | 70° |
| Field of View at 1000m | 28m | 33m | 35m | 44m | 44m |
| Exit Pupil | 2.3mm | 2.2mm | 2.2mm | 2.4mm | 2.4mm |
| Eye Relief | 20mm | 20mm | 20mm | 20mm | 20mm |
| Relative Brightness | 5.3 | 4.8 | 4.8 | 5.7 | 5.7 |
smc PENTAX XW10 with Spotting Scope
| Product name | PENTAX PF-100ED | PENTAX PF-80EDA | PENTAX PF-80ED | PENTAX PF-65EDAII | PENTAX PF-65EDII |
| 倍率 | 62X | 52X | 50X | 39X | 39X |
| Real Field of View | 1.1° | 1.4° | 1.4° | 1.8° | 1.8° |
| Apparent Field of View | 70° | 70° | 70° | 70° | 70° |
| Field of View at 1000m | 19m | 24m | 24m | 31m | 31m |
| Exit Pupil | 1.6mm | 1.6mm | 1.6mm | 1.7mm | 1.7mm |
| Eye Relief | 20mm | 20mm | 20mm | 20mm | 20mm |
| Relative Brightness | 2.6 | 2.6 | 2.6 | 2.9 | 2.9 |
smc PENTAX XW7 with Spotting Scope
| Product name | PENTAX PF-100ED | PENTAX PF-80EDA | PENTAX PF-80ED | PENTAX PF-65EDAII | PENTAX PF-65EDII |
| 倍率 | 90X | 74X | 71X | 55.5X | 55.5X |
| Real Field of View | 0.8° | 0.95° | 1.0° | 1.25° | 1.25° |
| Apparent Field of View | 70° | 70° | 70° | 70° | 70° |
| Field of View at 1000m | 14m | 16.5m | 17m | 21m | 21m |
| Exit Pupil | 1.1mm | 1.1mm | 1.1mm | 1.2mm | 1.2mm |
| Eye Relief | 20mm | 20mm | 20mm | 20mm | 20mm |
| Relative Brightness | 1.2 | 1.2 | 1.2 | 1.4 | 1.4 |
