According to the recent patent surfaced, Sigma is working on a brand new lens with a focal length of 28 to 85mm f2.8, and not only this lens in the same patent document you will also find the 24 to 70 mm F2.8 as well as the 28 to 70 mm F2.8.
As we all know there is a huge market for 24 to 70 mm focal range with a 2.8 aperture and the biggest problem is native lenses of Sony’s are costly or either you have to buy an F4 aperture or variable aperture based native kit lens, and so these third-party lens makers aggressively working in this particular focal range to offer multiple solutions to consumers at an affordable price tag to gain maximum market share possible.
Popular Sony Lenses among photographers and cinematographers
- Tamron 28-75mm F2.8 G2
- Tamron 35-150 F2-2.8
- Sigma 24-70mm F2.8
- Samyang 24-70mm F2.8
- Sigma 28-70mm F2.8
A long time ago, Tokina had a zoom called AT-X28-80mm f2.8. At that time, everyone was surprised at the brightness and the low price. I think Sigma wants to create the same lens again.
Patent Details
- Applicant: Sigma Co., Ltd.
Publication number: P2022067732
Application number: P 2020176481
Publication date: 2022-05-09 Title
of invention: Large-diameter zoom lens
More patent details here
- Example 1 (24-70mm F2.8)
Zoom ratio 2.75 Wide-
angle intermediate telephoto
focal length 24.72 39.76 67.98
F number 2.92 2.92 2.92
Full angle of view 2ω 85.24 56.96 34.33
Image height Y 21.63 21.63 21.63
Lens total length 135.00 145.60 171.09
Back focus 17.6206 17.6036 17.5749
- Example 3 (28-70mm F2.8)
Zoom ratio 2.35 Wide-
angle intermediate telephoto
focal length 28.81 40.01 67.69
F number 2.92 2.92 2.92
Full angle of view 2ω 75.92 56.06 33.85
Image height Y 21.63 21.63 21.63
Lens total length 120.04 126.08 142.66
Back focus 19.6292 19.5884 19.6020 - Example 4 (28-85mm F2.8)
Zoom ratio 2.90 Wide-
angle intermediate telephoto
focal length 28.79 49.98 83.51
F number 2.92 2.92 2.92
Full angle of view 2ω 75.61 45.42 27.77
Image height Y 21.63 21.63 21.63
Lens total length 135.02 146.97 164.94
Back focus 17.6146 17.5433 17.5817
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