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[M42] Pentacon electric 135mm f2.8

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鏡頭資料》 http://www.praktica-collector.de/Pentacon_electric_2.8_135_MC.htm

Producer:Kombinat VEB Pentacon Dresden (Feinoptisches Werk Görlitz)
Kadlubek-Lens Number:KWD 1340
Production Period:1971 to 1990
Aperture range:2.8 - 22
Construction:4 elements
Aperture Angle:18°
Filter Size:screw in: 55mm
Focusing Range:1.7m to infinity
Coating:multi coating (blue reflection)
other:built-in retractable lens hood

我有兩支 M42 135mm f2.8 鏡頭,Pentacon 135 最近對焦距離較 Zenit 135 遠,為 1.7 公尺;一般鏡頭型號會寫在前鏡,而 Pentacon 卻是寫在內建的遮光罩上頭。單層鍍膜,抗耀光能力不佳。有 M/A 切換鈕,可支援全開光圈對焦,縮光圈拍照。
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實拍照》
Pentax K10D + Pentacon electric 135mm f2.8
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鏡身照》
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鏡尾有幾個接點,Google 了一下,大致作用為機身快門擊發或半壓快門測光,以電流驅動鏡頭縮光圈。elecrtic 鏡頭只支援 Praktica 自己的機身,型號有 PLC、VLC、LLC 的機種開放光圈測光(可參考下表),在這些機型上只要半按快門,不需要 (有些機身亦取消設計) 按下測光/景深預覽開關便可直接進行測光,這項功能如在其他的 M42 機身上,只能當成一般的 Auto 鏡頭使用,由於手上沒有 Praktica 支援此功能的機身,無法測試。
(From: http://www.wretch.cc/blog/jastatw/14379471)

 

L Type Cameras (From: http://home-1.tiscali.nl/~ferdix/history2.htm)

 Model  Meter  Electric Lenses  Comments  Year
Praktica L No No The basic model no meter 1970
Praktica LLC TTL Yes TTL metering. Full aperture metering with electric lenses 1971
Praktica LTL TTL No TTL metering. Step down metering 1972
Praktica LB Non TTL No Uncoupled, non TTL meter 1972
Praktica VLC TTL Yes LLC with removable viewfinder. Viewfinder compatible with Exakta RTL1000 1974
Praktica L2 No No Improved Praktica L. Multi Coated lenses 1975
Praktica LTL2 TTL No Improved Praktica LTL. Multi Coated lenses 1975
Praktica PLC2 TTL Yes Improved Praktica LLC. Multi Coated lenses 1975
Praktica VLC2 TTL Yes Improved Praktica VLC. Multi Coated lenses 1975
Praktica EE2 TTL Yes Aperture priority with electric lenses. Top of the line camera. 1977
Praktica MTL3 TTL No Third generation LTL 1978
Praktica PLC3 TTL Yes Third generation LLC 1978
Praktica VLC3 TTL Yes Third generation VLC 1978
Praktica EE3 TTL Yes Same as EE2.Aperture priority with electric lenses. 1978
Praktica MTL5 TTL No Fourth(?) generation LTL 1983
Praktica MTL5b TTL No Fifth(?) generation LTL 1985
Praktica MTL50 TTL No Led information in the viewfinder. Otherwise the same as the MTL5b. The last of the screw mount Prakticas 1985

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