這是一顆雙高斯結構人像頭,不過,我懷疑它不是原生M42卡口,而是改過的...
關於這顆80mm f2.8 Biometar網路上有很多考究,一般常見的是Exakta與P6卡口,似乎是由Schneider 代工生產...
在DCHOME.NET的CZJ簡歷之雙高斯結構人像頭80MM f2.8 BIOMETAR CARL ZEISS M42 + 5D2一文中有這麼一段:
I believe that the 80mm f2.8 Biometar is a original m42 lens, similar to
80mm f2.8 Tessar. There are two reasons for my assertion:
The book by Hans-Jurgen Kuc: Contax -Geschichte Teil 1945-1982 pp 80-84
lists all the lenses for Contax S ( m42 camera ), where both in m42
mount are listed.
These two lenses in Exakta mount also show up in aution site from time
to time, it is quite unlikely people would modify these lenses into
Exakta mount. Furthermore, if these lense are for the Pentacon Six
cameras in the first place, there are original adapters from Pentacon to
change to m42, it is just not necessary to do any modification.
另外,在CAPTAIN JACKS發現Exakta卡口的80mm f2.8 Biometar光圈是2.8-16,明顯與此鏡不同;因此,我推測此物應是P6卡口所改(沒人規定有轉接環就不能改卡口吧...)
雖然原生M42口的身價大不同,不過,拍的高興最重要,身價太高用起來反而綁手綁腳,何況上面寫著的還是Carl Zeiss Jena啊~~
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