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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 || 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://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] 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. 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> |
| 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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