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Anthony_TT 發表於 2010-12-30 09:02:14 | 顯示全部樓層 |閱讀模式
強光點在照片上呈現出 " Sun Star",No. of points for that Sun-Star is determined by how many number of aperature blades.
Although the term is named as "Sun-Satr", we typically observed them at Night Scene as any point light source in dark scene (night scene) will turn itslef apparently into a Strong Light sources.

For easy reference:
三角星: NA
四角星: ? or Art Filter
五角星: NA
六角星: 三片或六片光圈頁
七角星: 不存在,NA
八角星: 八片光圈頁
九角星: 不存在,NA
十角星: 五片
11角星: 不存在,NA
12角星: 比較少見,或12片光圈
13角星: 不存在,NA
14角星: 7片

Rollei 135 形的鏡頭有很多是3片光圈頁,
Hasselblad-Zeiss 鏡頭是5片光圈頁的典範。
 樓主| Anthony_TT 發表於 2010-12-30 09:17:31 | 顯示全部樓層
Diatagon 35 f1,4 (8 aperature blades) 及 PC-Distagon 35 f2.8 (6 aperature blades),但於夜間風景照而言(Quality is tact sharp for both) Sun-Satr appears as 8 point Star for 35f1.4 and 6 point satr for PC-Distagon 35 f2.6.
Just because I don't like such artistic look/feel, I would rather use the Leica PC 28 - 5 blades (in fact it is a Schneider lens) or Hasselblad-Zeiss Lens for Night Shots. It will give you a more appealing 10 point star for those point light souces (it is NOT art filter).
For similar reason, for night shots gradually I switched to use more lens from Schneider or Rodenstock (as they typically deploys Copal or Compur Shutter that usually comes with 5 or 7 aperature blade).

It is much regretted that the optic-gems from Leica (R series not the M series) is typically come with 6 aperature blades........
 樓主| Anthony_TT 發表於 2010-12-30 09:24:10 | 顯示全部樓層
I also like Nikon... as its lens typically opt for "7 aperature blades" or other ODD number aperature Blades.

Pentax (manual)- typically 6 Aperature Blades
Olympus (manual) - typically 6 aperature baldes
andylkk 發表於 2010-12-31 12:36:05 | 顯示全部樓層
本帖最後由 andylkk 於 2010-12-31 12:37 編輯

Hi Ching,

Thanks for your sharing!
FYI,  Pentax actually starts very early to have "odd number aperture blades.  From their film manual age, they have the limited lens with 9 blades such as 31F1.8 and 77F1.8.  And going into the digital age, their DA* lens seems starting to crazy about blades, begin to all have 9 blades.  And the DA*55F1.4 even have 9 round blades.  So I do agree that maybe round blades will be the future~
Personally I tried the modern DA* lens with 9 blades.  The stars do shows somewhat different than its normal 6 blades lens.  As i'm in office now, i will post some photos when i back home later~ (hope that i will not get too drunk tonight)
mantel 發表於 2010-12-31 16:37:07 | 顯示全部樓層
a lot of Rollei 85mm 1.4 has aperture with 三角星
 樓主| Anthony_TT 發表於 2011-1-11 18:45:04 | 顯示全部樓層
a lot of Rollei 85mm 1.4 has aperture with 三角星
mantel 發表於 2010-12-31 16:37

Hi, Believe it or NOT, or just verify it yourself ... there should be 六角星: 三片或六片光圈頁
For Odd number of aperature blades, the number of sun-star is 2X number of blades.
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