Nifty forties

Canon EF 40mm F/2.8 STM ⌀52Pancake lens 2012 
Canon TS-E 45mm F/2.8 ⌀72Pro 1991 
Carl Zeiss Planar T* 45mm F/2 E46 1994 
Carl Zeiss Jena Biotar 40mm F/2 E40.5 1933 
Carl Zeiss Tessar T* 45mm F/2.8 [AE, MM] E49Pancake lens 1982 
Cosina Cosinon Auto 45mm F/2.8 MC ⌀49
akaAuto Chinon 45mm F/2.8
akaRevuenon Auto 45mm F/2.8
1979 
Cosina Cosinon Auto 40mm F/2.5 MC ⌀49Pancake lens
akaBauer Neovaron 40mm F/2.5 Multicoated
akaPorst Color Reflex Auto 40mm F/2.5 MC
akaVivitar Auto 40mm F/2.5 VMC
1978 
Konica Hexanon AR 40mm F/1.8 ⌀55Pancake lens 1978 
Leitz Wetzlar Elmarit-C 40mm F/2.8 [11541] S.5.5 1973 
Leitz Wetzlar Summicron-C 40mm F/2 [11542] S.5.5Pancake lens 1973 
Minolta M-Rokkor 40mm F/2 for CL ⌀40.5Pancake lens 1973 
Sigma 40mm F/1.4 DG HSM | A ⌀82Pro 2018 
Sigma 45mm F/2.8 DG [DN] | C ⌀55 2019 
Minolta M-Rokkor 40mm F/2 for CLE ⌀40.5Pancake lens 1981 
Minolta Rokkor-TD 45mm F/2.8 ⌀46Pancake lens 1964 
Minolta MD Rokkor 45mm F/2 ⌀49 1978 
Chiyoko Super Rokkor 45mm F/2.8 [C] LSM 1947 
Multi-system lenses (3)
Carl Zeiss Jena DDR Tessar 40mm F/4.5 T Type 1 E30.5
Carl Zeiss Jena DDR Tessar 40mm F/4.5 [T] Type 2 E49
Meyer-Optik Gorlitz Helioplan 40mm F/4.5 V 1952 
Nippon Kogaku / Nikon GN Nikkor[·C] Auto 45mm F/2.8 ⌀52Pancake lens 1968 
Nikon AI-S Nikkor 45mm F/2.8P ⌀52Pancake lens 2001 
Nikon PC-E Micro Nikkor 45mm F/2.8D ED ⌀77Pro 2008 
Nikon Nikkor Z 40mm F/2 ⌀52 2021 
Nikon Nikkor Z 40mm F/2 SE ⌀52 2022 
Olympus OM Zuiko Auto-S 40mm F/2 ⌀49Pancake lens 1983 
smc Pentax-M 40mm F/2.8 ⌀49Pancake lens 1976 
smc Pentax-FA 43mm F/1.9 Limited ⌀49Pancake lens 1997 
HD Pentax-FA 43mm F/1.9 Limited ⌀49Pancake lens 2021 
Ricoh XR Rikenon 45mm F/2.8 ⌀52Pancake lens 1994 
Sony FE 40mm F/2.5 G [SEL40F25G] ⌀49 2021 
Third party 35mm full frame lenses (41)
MS Optics H-Protar 40mm F/6.3 MC Macro ⌀22.5 @ 0.60mPancake lens 2017 
MS Optics H-Dagonar 40mm F/6.3 MC Macro ⌀22.5 @ 0.60mPancake lens 2018 
Rockstar 40mm F/5.6 M ⌀46 2022 
Schneider-Kreuznach Isogon 40mm F/4.5 ⌀49 1951 
Hartblei Zeiss Super-Rotator 40mm F/4 IF TS E86Pro 2008 
Steinheil Munchen Cassaron 40mm F/3.5 VL ⌀34 1952 
Kamerabau-Anstalt-Vaduz Kilfitt-Makro-Kilar D 40mm F/3.5 C ⌀491:1 1955 
Kamerabau-Anstalt-Vaduz Kilfitt-Makro-Kilar E 40mm F/3.5 C ⌀491:2 1955 
Olympus Zuiko C. 40mm F/2.8 LSM 1950 
Kamerabau-Anstalt-Vaduz Kilfitt-Makro-Kilar D 40mm F/2.81:1
akaHeinz Kilfitt Munchen Makro-Kilar D 40mm F/2.8
akaZoomar Muenchen Zoomatar D 40mm F/2.8 Macro
1956 
Kamerabau-Anstalt-Vaduz Kilfitt-Makro-Kilar E 40mm F/2.81:2
akaHeinz Kilfitt Munchen Makro-Kilar E 40mm F/2.8
akaZoomar Muenchen Zoomatar E 40mm F/2.8 Macro
1956 
Rollei HFT Sonnar 40mm F/2.8 LSM (430 units) ⌀39 2002 
Yongnuo 40mm F/2.8 F ⌀58 2017 
Cosina Voigtlander Heliar 40mm F/2.8 Aspherical VM ⌀34Pancake lens 2022 
Cosina Voigtlander Heliar 40mm F/2.8 Aspherical LSM ⌀34Pancake lens 2022 
Viltrox Air AF 40mm F/2.5 ASPH ED IF STM ⌀52 2024 
Kinoshita Kistar 40mm F/2.4 ⌀49 2020 
Kinoshita Kistar 40mm F/2.4 M ⌀43 2022 
Cosina Voigtlander Ultron 40mm F/2 Aspherical SL ⌀52 2002 
Cosina Voigtlander Ultron 40mm F/2 Aspherical SL II ⌀52Pancake lens 2007 
Cosina Voigtlander Ultron 40mm F/2 Aspherical SL II N ⌀52Pancake lens 2012 
Cosina Voigtlander Ultron 40mm F/2 Aspherical SL II S ⌀52 2017 
ZEISS Batis Distagon T* 40mm F/2 CF E67 2018 
Cosina Voigtlander Nokton 40mm F/1.4 Classic Line VM ⌀43 2004 
Sigma 40mm F/1.4 DG HSM | A ⌀82Pro 2018 
Cosina Voigtlander Nokton 40mm F/1.2 Aspherical E ⌀58 2017 
Cosina Voigtlander Nokton 40mm F/1.2 Aspherical VM ⌀52 2017 
Cosina Voigtlander Nokton 40mm F/1.2 Aspherical SE ⌀58 2020 
Cosina Voigtlander Nokton 40mm F/1.2 Aspherical Z ⌀58 2022 
Cosina Voigtlander Nokton 40mm F/1.2 Aspherical RF ⌀58 2023 
Cosina Voigtlander Nokton 40mm F/1.2 Aspherical II VM ⌀52 2025 
Yasuhara MoMo100 43mm F/6.4 Soft Focus ⌀37Pancake lens 2016 
smc Pentax-L 43mm F/1.9 Special (2000 units) ⌀40.5 2000 
Kenko 45mm F/4.5 Soft MC [T] ⌀52 1995 
Lensbaby Sol 45mm F/3.5 SLR ⌀46 2018 
Lensbaby Sol 45mm F/3.5 ⌀46 2018 
Petri C.C Auto 45mm F/2.8 ⌀49 1976 
Tamron SP 45mm F/1.8 Di [VC] USD F013 ⌀67 2015 
Samyang AF 45mm F/1.8 FE ⌀49
akaRokinon AF 45mm F/1.8 FE
2019 
Irix 45mm F/1.4 SLR ⌀77 2020 
Venus Optics Laowa Argus 45mm F/0.95 FF II ⌀72 2021