Talk:Ultron
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.. "This lens had an extra concave front element. The same designed of the Ultron was also used for the Takumar 55/1.8." This could be misunderstood, the Takumar 55/1.8 has no concave front element. Actually, after the design of the Ultron, the world of nifty-fifty lenses can be divided into two groups: 6/5-lenses (Nikon, Pentax, Minolta,..) and 6/4-lenses (Canon FD, Olympus,..). --Joerg Krueger (talk) 14:13, 17 January 2023 (UTC) Good point, I have make that comment invisible until coming up with something better Titrisol (talk) 14:24, 17 January 2023 (UTC) Made a section for other makers that adopted similar designs. Better?Titrisol (talk) 20:18, 17 January 2023 (UTC)
Yes, the section with a list of Ultron-"copies" is a good idea. Important is, that a reader doesn't think the Takumar 1.8/55 has a concave front lens element like the Zeiss Ultron.--Joerg Krueger (talk) 12:40, 18 January 2023 (UTC)