  
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 |
|
1994年成立 
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