CONTAX CLUB Carl Zeiss 討論區

香港互聯網康泰時攝影會
現在的時間是 週五 29 3月 24 01:40:08

所有顯示的時間為 UTC + 8 小時




發表新文章 回覆主題  [ 23 篇文章 ]  前往頁數 上一頁  12
發表人 內容
 文章主題 :
文章發表於 : 週一 16 11月 09 12:05:03 
討論區會員

註冊時間: 週二 07 8月 07 21:40:37
文章: 63
來自: hongkong
After test,
http://www.mobile01.com/topicdetail.php?f=255&t=1308059, it shows
M3/4 sensor is not suitable for Contax G lens.


回頂端
 個人資料  
 
 文章主題 :
文章發表於 : 週一 16 11月 09 17:37:32 
討論區管理員

註冊時間: 週四 27 11月 03 02:15:48
文章: 3194
來自: Moon Base Alpha
Not a surprise , I recall way back I've mentioned it already, that almost all old lens for film is in some way unsuitable for digital mostly due to their optical design catered for a different media, and lens of the like in Leica M, Contax G, and similar RF mount having extended back elements would post such issue with incidence angle.

The M4/3 , being only about 30%+ in area coverage vs the 24X36mm film frame, already shown that.

Even lens without the protruding rear element might not be producing quality enough if not used with conservation ( stop down ). I've got some M4/3 shoots taken with the Leice Elmar 50/2.8 and Zeiss Sonnar 50/2.0 ( Leica screw, coated version ) that simply shown low contrast, and low acutence at wide open and with significant visible spherical abbe. and coma .. one really need to learn to used them within the scope of the lens design vs the need of the media ( digital sensor )

_________________
圖檔 圖檔 圖檔


回頂端
 個人資料  
 
 文章主題 :
文章發表於 : 週二 17 11月 09 02:29:00 
CONTAX CLUB 會員
CONTAX CLUB 會員

註冊時間: 週六 08 1月 05 22:54:51
文章: 2268
來自: Hong Kong
FR, do u think by developing a curved sensor so that all light rays are perpendicular to the sensor surface to solve the problem? i am just curious if there is any solution to this ....

_________________
Contax : RTS, RTSII(50Y), RTSIII, Aria D, Aria(70Y), N1, ND, T3D(70Y), G2D
Nikon : FM3A, FM3AB
Leica : M9, X1
Fuji : X100
OM : EP2


回頂端
 個人資料  
 
 文章主題 :
文章發表於 : 週二 17 11月 09 10:29:21 
討論區會員

註冊時間: 週二 07 8月 07 21:40:37
文章: 63
來自: hongkong
Get rid of IR filter, then apply a T* coating on sensor surface to reduce the reflection.


回頂端
 個人資料  
 
 文章主題 :
文章發表於 : 週二 17 11月 09 13:12:34 
事務局長
事務局長

註冊時間: 週日 09 11月 03 03:42:29
文章: 12296
Raimondi 寫:
FR, do u think by developing a curved sensor so that all light rays are perpendicular to the sensor surface to solve the problem? i am just curious if there is any solution to this ....

technically...this is extremely difficult to do so....if you know the process on how to make a chips......(I mean IC..)

_________________
事務局長

Damn, my Calon Segur heart fall in love with Haut Brion


回頂端
 個人資料  
 
 文章主題 :
文章發表於 : 週二 17 11月 09 14:55:12 
討論區會員

註冊時間: 週二 07 8月 07 21:40:37
文章: 63
來自: hongkong
Raimondi 寫:
FR, do u think by developing a curved sensor so that all light rays are perpendicular to the sensor surface to solve the problem? i am just curious if there is any solution to this ....


Based in my understanding, the focus plane of lens is not curved, so it cannot make a "clear" image on a curved sensor for normal lens.


回頂端
 個人資料  
 
 文章主題 :
文章發表於 : 週三 18 11月 09 15:10:21 
討論區管理員

註冊時間: 週四 27 11月 03 02:15:48
文章: 3194
來自: Moon Base Alpha
And its not just the Focus Plane. whatever sensor technology goes, does not solve what the lens itself cannot provide. There is something sensor technology might do to help , say , no AA filter , backside illumination ( no signal grid depth , reduced flare/light grid depth etc ... but still if the lens had those residual Abberation, those would remain. Film does not show because film imaging elements ( individual dye particle or grain ( is not aligned and not ina grid pattern , and thus hide those defect or rather don't show visually enough )

Simly put one just had to learn that those lens when used on digital is simply reflecting a new imaging different from theirf film capture. Learn to live and utilize them as they are is it. I had plenty of old MF lens that can said to be rather medicore when used with digital without moderation, but that dos not mean they cannot produce decent quality image, just used them within their context and limitation

_________________
圖檔 圖檔 圖檔


回頂端
 個人資料  
 
 文章主題 :
文章發表於 : 週二 23 2月 10 19:13:36 
討論區新手

註冊時間: 週三 20 1月 10 08:47:46
文章: 6
Some update to the mount (yes, that's my thread in another forum)
http://www.omuser.com/viewthread.php?tid=109065

There is even the version 3 of the mount (see new messages), but I doubt how it works...


回頂端
 個人資料  
 
顯示文章 :  排序  
發表新文章 回覆主題  [ 23 篇文章 ]  前往頁數 上一頁  12

所有顯示的時間為 UTC + 8 小時


誰在線上

正在瀏覽這個版面的使用者:沒有註冊會員 和 17 位訪客


不能 在這個版面發表主題
不能 在這個版面回覆主題
不能 在這個版面編輯您的文章
不能 在這個版面刪除您的文章

搜尋:
前往 :  
cron
Powered by phpBB® Forum Software © phpBB Group
正體中文語系由 竹貓星球 維護製作