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Sigma Patent for compact full frame primes
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Sigma Patent for compact full frame primes
MirrorlessReports Admin
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Sigma Patent for compact full frame primes

It seems like Sigma is not done with small FE and L mount primes. A discovered patent application contains not only the released 45mm F2.8, but others as well.

Keep in mind that the lens length is all the way to the sensor, the lens mount, so these lenses are at least 18mm less in length - making them quite compact.

This patent application contains;

Sigma 40mm F2.8​

                      Infinity      Close Focus  
Focal Length          40.00         34.53
F-Number               2.90          3.08
half-field angle      55.84         53.58
Image height          21.63         21.63
total lens length     63.57         63.57
Sigma 50mm F2.8

                      Infinity      Close Focus 
Focal Length          50.72         34.65
F-Number               2.90          2.98
half-field angle      44.98         44.39
Image height          21.63         21.63
total lens length     64.52         64.52

Sigma 60mm F2.8

                      Infinity     Close Focus
Focal Length          58.00        44.21
F-Number               2.90        2.95
half-field angle      39.82       39.34
Image height          21.63       21.63
total lens length     64.57       64.57

Japan Patent Application 2019-211703

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