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| || medium || f1.8 || f2.8 || f3.5 || '''f2.0''' lenses established the available light photography with the [[Ernostar]] in 1924.<br/>The 2nd version of the Ernostar also set the benchmark already in 1925. | | || medium || f1.8 || f2.8 || f3.5 || '''f2.0''' lenses established the available light photography with the [[Ernostar]] in 1924.<br/>The 2nd version of the Ernostar also set the benchmark already in 1925. |
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− | || [[35mm]],<br/>full-frame|| f0.87 || f1.4 || f1.8 || '''f1.6''', because faster than f1.8.<br/>f/1.8 is a lens speed which is almost average for the [[SLR]] normal lenses, since the 1960s. Such [[normal lens]]es were also the kit lenses. Fast lenses for [[leaf shutter]] SLRs reach only f1.9 max. lens speed. The benchmark value here is taken from the Farrand Super-Farron 76 mm f/0.87, made for Leica/Visoflex fitting.<ref>[https://wlpa.auction2000.online/auk/w.Object?inC=WLPA&inA=20140812_1547&inO=544 Farrand New York, Super-Farron 76 mm f/0.87] offered for sale (but unsold) at the [https://wlpa.auction2000.online/auk/w.ObjectList?inSiteLang=&inC=WLPA&inA=20140812_1547 27th Camera Auction] by [https://www.leitz-auction.com/auction/en/home Westlicht Photographica Auction] (now Leitz Photographica Auction), in June 2015. The auction listing cites [https://worldwide.espacenet.com/patent/search?q=pn%3DUS2846923A US Patent 2846923], ''High speed objective lens with anastigmatically flattened field'' filed 25 February 1957 and granted 12 August 1958 to Albrecht W. Tronnier as assignee to Farrand Optical Co., Inc. - patent archived at [http://worldwide.espacenet.com/ Espacenet], the patent search facility of the European Patent Office.</ref> | + | || [[35mm]],<br/>full-frame|| f0.87 <br/>(or f/0.33?) || f1.4 || f1.8 || '''f1.6''', because faster than f1.8.<br/>f/1.8 is a lens speed which is almost average for the [[SLR]] normal lenses, since the 1960s. Such [[normal lens]]es were also the kit lenses. Fast lenses for [[leaf shutter]] SLRs reach only f1.9 max. lens speed. The 'benchmark' value here is taken from the Farrand Super-Farron 76 mm f/0.87, made for Leica/Visoflex fitting; rare, but made for sale.<ref>[https://www.leitz-auction.com/en/Farrand-New-York-Super-Farron-0.87-76mm/AI-27-31619 Farrand New York, Super-Farron 76 mm f/0.87] with a Leica bellows and [[Visoflex]] unit, offered for sale (but unsold) at the [https://www.leitz-auction.com/en/Cameras/Past-Auctions/Auction-27/ 27th Westlicht Photographica Auction] (now Leitz Photographica Auction), in June 2015; and [https://www.leitz-auction.com/en/Voigtlaender-Super-Farron-0.87-76mm/AI-25-30083 another 76/0.87 Super-Farron] in [[Compound]] shutter, and ''adapted'' for an [[Exakta]] body, sold at the [https://www.leitz-auction.com/en/Cameras/Past-Auctions/Auction-25/ 25th Westlicht Auction], in March 2014. The 2015 auction listing cites [https://worldwide.espacenet.com/patent/search?q=pn%3DUS2846923A US Patent 2846923], ''High speed objective lens with anastigmatically flattened field'' filed 25 February 1957 and granted 12 August 1958 to Albrecht W. Tronnier as assignee to Farrand Optical Co., Inc. - patent archived at [http://worldwide.espacenet.com/ Espacenet], the patent search facility of the European Patent Office.</ref> A non-functional 40mm f/0.33 joke lens was made by Carl Zeiss in 1965, purely as a publicity stunt.<ref>[https://www.leitz-auction.com/en/Carl-Zeiss-Super-Q-Gigantar-0-33-40mm/AI-19-12712 Carl Zeiss Super-Q-Gigantar 40mm f/0.33] serial no.124037 for [[Contarex]] Bullseye, sold at the [https://www.leitz-auction.com/en/Cameras/Past-Auctions/Auction-19/ nineteenth Westlicht Auction], in May 2011.</ref> |
− | This category was started by the Carl Zeiss Jena [[Sonnar 50mm]] f/1.5 in 1932 | + | This category was started by the Carl Zeiss Jena [[Sonnar 50mm]] f/1.5 in 1932. |
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| || 35mm<br>[[half-frame]]<br>and [[APS-C]] || f0.95 || f1.8 || f2.8 || '''f1.4''' because smaller format than 35mm requires faster lenses for achieving almost similar [[depth of field]] | | || 35mm<br>[[half-frame]]<br>and [[APS-C]] || f0.95 || f1.8 || f2.8 || '''f1.4''' because smaller format than 35mm requires faster lenses for achieving almost similar [[depth of field]] |