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pentax MEF!!!?

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雷蒂

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Jan 12, 1996, 3:00:00 AM1/12/96
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==> 翻了約十年前的攝影雜誌!看到Pentax-MEF 的廣告
是Auto-Focus的!!請問能接現在的AF鏡頭而有自動對焦
的功能嗎? 或有誰能post 相關資料?? 謝謝
ps感謝Erik 兄熱心post Pentax Lx 規格!!!

Bo-Ming Tong

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Jan 13, 1996, 3:00:00 AM1/13/96
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From the Pentax FAQ at
http://www.sm.luth.se/~jem/foto/pfaq/cameras/c35m.html

What is ME-F ?

ME-F is an early attempt of Pentax on autofocusing. It is claimed to be
the first autofocus SLR employing a TTL autofocus sensor. It was
introduced in the early 80s with a 35-70 autofocus lens. The lens has an
internal motor inside just like F3AF and the modern Canon EOS. At that
time, the internal motor is big and heavy, the autofocusing of the
camera leaves something to be desired (it was tested to be as poor as
F3AF). As a result, the ME-F had the same fate of Nikon F3AF and Canon
T80 of the same era.

However, the ME-F employs the standard K-mount. The significance of ME-F
nowadays is that you get an ME-super with a so-so quality electronic
in-focus indicator. The 35-70 AF lens for ME-F will not
autofocus on the SF/Z/PZ series of bodies. The current F and FA lenses
will not autofocus on ME-F either.
--
Bo-Ming Tong 唐寶明

牙籤

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Jan 14, 1996, 3:00:00 AM1/14/96
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引述 lady...@csie.nctu.edu.tw (雷蒂) 的名言:            

>>==> 翻了約十年前的攝影雜誌!看到Pentax-MEF 的廣告         
>> 是Auto-Focus的!!請問能接現在的AF鏡頭而有自動對焦        
>> 的功能嗎? 或有誰能post 相關資料?? 謝謝            
=============================================================    
是不是那台 PENTAX 機之鏡頭下面,有長出一個"大腫瘤"的那組相機ㄚ?那算
是早期的自動對焦相機,和 Canon 的 T80 之設計很像。屬於鏡頭內含驅動馬
達的自動對焦設計,不過那時還沒有發展像今天的 AFD 的弧形或 USM 的環型
馬達,所以鏡頭都長得一附怪樣子(每隻鏡頭都長出一個對焦馬達的"瘤"),
不過這兩台相機組合都只算是過渡的實驗機種吧,不但鏡頭少的可憐而且很快
就"消失"在市場上了。另外值得一提的是 Sigma這家鏡頭製造廠,曾經根據類
似的自動對焦概念概念發展一支特殊設計的鏡頭,叫做 Sigma U-AF 55-200mm
f4.5的鏡頭,可以接在各家不同牌子的手對對焦相機機身上,卻有自動對焦的
功能----神奇吧!該鏡頭的對焦馬達以及對焦檢測元件都設計在鏡頭上面,故
鏡頭旁邊也"腫"了一塊(但因科技較晚較新,所以沒有腫得太大),因此即使
機身不支援自動對焦,鏡頭本身仍舊可以做自動對焦的操作,但大約四五年前
就停產了,和 Nikon F3 -AF、Canon T-80 以及 PENTAX 的那台相機一樣,因
為新的自動對焦科技很快都出籠且受到歡迎,而很快成為昨日黃花。     
                                   

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