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<blockquote data-quote="Brian" data-source="post: 228208" data-attributes="member: 17621">&quot;Fast&quot; lens is also a term to describe large aperture lenses, used since the 1930s- they were called &quot;fast&quot; as they let you shoot a at a higher shutter speed and stop &quot;fast&quot; action. F1.5 lenses were called &quot;Super-Speed&quot; lenses. Most large aperture lenses suffer from focus shift, some more than others. There are optical techniques to reduce it, such as aspheric surfaces and using a long-drawn out optical path. I've read users complain that the Nikkor 50/1.4 &quot;G&quot; series lens suffers from focus shift. The 55/1.2 certainly does: at 3ft, the focus shift is greater than 1&quot; when stopping down from f1.2 to F4.The &quot;Fabulous Fifties&quot;... Most of my cameras have 50s on them, used for informal portraits, night photography, museum shots, most of my general photography. I need to upload more shots to the gallery here. Most taken with Digital will be Nikon RF lenses, now that I have the Df- will be shooting more with the SLR.And 1 example shot- Informal existing Light Portrait at Night....of my daughter. This is with a 1934 Carl Zeiss Jena 5cm F1.5 Sonnar, I converted this lens to Leica mount. It's one of the oldest &quot;Super-Speed&quot; lenses ever made.</blockquote>

[QUOTE="Brian, post: 228208, member: 17621"] "Fast" lens is also a term to describe large aperture lenses, used since the 1930s- they were called "fast" as they let you shoot a at a higher shutter speed and stop "fast" action. F1.5 lenses were called "Super-Speed" lenses. Most large aperture lenses suffer from focus shift, some more than others. There are optical techniques to reduce it, such as aspheric surfaces and using a long-drawn out optical path. I've read users complain that the Nikkor 50/1.4 "G" series lens suffers from focus shift. The 55/1.2 certainly does: at 3ft, the focus shift is greater than 1" when stopping down from f1.2 to F4. The "Fabulous Fifties"... Most of my cameras have 50s on them, used for informal portraits, night photography, museum shots, most of my general photography. I need to upload more shots to the gallery here. Most taken with Digital will be Nikon RF lenses, now that I have the Df- will be shooting more with the SLR. And 1 example shot- Informal existing Light Portrait at Night....of my daughter. This is with a 1934 Carl Zeiss Jena 5cm F1.5 Sonnar, I converted this lens to Leica mount. It's one of the oldest "Super-Speed" lenses ever made. [/QUOTE]

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