PATENT: Sigma’s Triple Threat! 28-105mm, 28-85mm, and 35-150mm F2.8 Found in P2025182227

By Louis Ferreira | Published: December 16, 2025


Sigma 28-105mm f/2.8 ART: B&H Photo / Amazon / Adorama

Sigma has just had a new patent published (JP 2025-182227) which appears to contain the optical formula for the recently released 28-105mm F2.8 DG DN | Art, along with a few other fascinating sibling lenses that haven’t hit the market—yet.

The patent, published on December 15, 2025, describes a “Variable Magnification Optical System” designed to be compact while maintaining a large aperture (F2.8) and high zoom ratio. While one example matches the specs of the 28-105mm F2.8 almost perfectly, the other examples hint at alternative “standard zoom” concepts Sigma was exploring, including a wider 28-85mm and a portrait-focused 35-150mm.

Here is the breakdown of the optical formulas found in the patent:

Example 1: 28-105mm F2.8 (The Real World Lens)

This appears to be the optical recipe for the shipping Sigma 28-105mm F2.8 DG DN Art.

  • Focal Length: 28.55 – 102.37 mm
  • F-Number: 2.91 (F2.8)
  • Half Angle of View: 77.11 – 22.75 degrees
  • Image Height: 21.63 mm (Full Frame)
  • Lens Length: 174.47 – 216.16 mm

Example 3: 28-85mm F2.8 (The Compact Alternative)

This is an interesting “what if” lens. Instead of reaching to 105mm, it trades telephoto reach for a more compact design. In the real world, this would likely be marketed as a 28-85mm F2.8. This would have been a direct competitor to classic standard zooms but with a unique range.

  • Focal Length: 28.72 – 84.45 mm
  • F-Number: 2.91 (F2.8)
  • Half Angle of View: 76.47 – 28.04 degrees
  • Lens Length: 161.89 – 206.15 mm

Example 6: 35-150mm F2.8 (The Portrait Specialist)

This looks like a direct competitor to the popular Tamron 35-150mm. It provides a highly versatile range for portrait and event photographers who want to avoid changing lenses, all while keeping that constant F2.8 aperture.

  • Focal Length: 36.05 – 148.94 mm
  • F-Number: 2.91 (F2.8)
  • Half Angle of View: 64.53 – 16.07 degrees
  • Lens Length: 199.15 – 249.15 mm

Takeaway It is common for manufacturers to patent multiple variations of a lens design during development. It seems Sigma decided the 28-105mm offered the best balance of size and versatility for the market, leaving the 28-85mm and 35-150mm on the drawing board—for now. Would you have preferred a 28-85mm F2.8 or a 35-150mm F2.8 over the 28-105mm? Let us know in the comments.

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Posted in 3rd Party Lens, Patents| Tagged , , | 20 Comments

Sony a7V Finally Listed On Amazon and More Hands-on Perspectives

By Louis Ferreira | Published: December 16, 2025


Sony a7V:
B&H Photo / Amazon / Adorama

The Sony a7V has finally been listed on Amazon, but there are currently only like new used camera listings and a few new cameras listed with markup.

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Posted in Sony a7V| 3 Comments

New 7Artisans 50mm f/1.2 Announced – A Fun Budget Option

By Louis Ferreira | Published: December 15, 2025


7Artisans 50mm f/1.2: B&H Photo

The 7Artisans 50mm f/1.2 has been announced, and it has an interesting built-in lens hood that reminds me of the Leica Summilux. The lens in no way will compete with the Summilux, but it could be a fun lens to own, thanks to its rich character. If you don’t have a cheap character centric 50mm lens, then this might be the lens for you.

Key Features

  • APS-C Format | f/1.2 to f/16
  • 75mm (35mm Equivalent)
  • Manual Focus Design
  • Minimum Focusing Distance: 2.3′
  • 11-Blade Diaphragm

Posted in 3rd Party Lens| Tagged , , | 12 Comments

Sony Savings Sunday Holiday Edition

By Louis Ferreira | Published: December 14, 2025


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Lenses
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Tamron Lenses
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Tamron 35mm F/2.8 Di III OSD M1:2 Save $50:
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Sigma Lenses
SIGMA 28-70mm f/2.8 DG DN Contemporary Save $50:
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20% Off Viltrox
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Viltrox AF 27mm f/1.2 Pro: B&H Photo / Amazon
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Viltrox AF 28mm f/1.8 FE: B&H Photo / Amazon

VILTROX 85mm f/1.8 II: B&H Photo / Amazon
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Viltrox 50mm f/1.8: B&H Photo / Amazon
Viltrox 35mm f/1.8: B&H Photo / Amazon
Viltrox 24mm f/1.8: B&H Photo / Amazon
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Viltrox 50mm f/1.4: B&H Photo / Amazon

Viltrox AF 50mm f/2: B&H Photo / Amazon

Viltrox AF 20mm f/2.8 FE:  B&H Photo / Amazon

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New Apple M2/M3 Ultra: B&H Photo / Amazon
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Posted in Deals| 23 Comments

Brightin Star AF 24mm f/1.8 Announced

By Louis Ferreira | Published: December 13, 2025


The Brightin Star AF 24mm f/1.8 was just announced and is now available via Amazon.

  • 24mm Full Frame Wide Angle Lens: You can take excellent photos in a variety of scenarios using the 24mm f/1.8 AF full-frame lens: landscapes, humanities, indoor portraits, and architectural photography.
  • F1.8 Large Aperture: The Brightin Star 24mm f/1.8 features a large aperture of f/1.8 combined with 14 aperture blades can display details and highlight the subject in low light environments.
  • 11 Group 14 Element Optical Structure: 2 high-precision aspherical elements, 3 ED low-dispersion elements, and 3 high-refractive-index elements. This effectively controls aberrations and distortion, effectively suppresses purple fringing, and enhances overall image sharpness and clarity.
  • High-Speed, Silent Autofocus: Experience fast, accurate, and silent autofocus with the STM stepping motor. The portrait focus system automatically detects faces and eyes for precision.
  • Professional Video Shooting: With a breathing effect rate as low as 0.5%, it virtually eliminates image jump, ensuring stable composition and making it suitable for various video shooting scenarios.


https://www.youtube.com/watch?v=aOb8wYl-1fo

Posted in 3rd Party Lens| Tagged , , , , | 12 Comments

TTArtisan 35mm/50mm/85mm T2.1 Dual Bokeh Cine Lenses

By Louis Ferreira | Published: December 12, 2025


TTArtisan announced three new cine lenses: the 35mm/50mm/85mm T2.1.

Focal length35mm50mm85mm
ColorBlack
Aperture rangeE / X / Z / RF / LE / Z / RF / L
MountT2.1 ~ T22（Declicked Aperture）
FrameFull Frame
Optical Design10 Elements in 7 Groups7 Elements in 6 Groups8 Elements in 7 Groups
Angle of View63°47°28.9°
Closest Focusing Distance (Soft）0.28m0.65m0.6m
Closest Focusing Distance (Bubble）0.55m0.45m0.67m
Diaphragm Blades11pcs
Filter Size82mm
Gear Pitch0.8 Mod
MaterialAviation-grade aluminum
WeightEAround 678gAround 727gAround 779g
XAround 669g
ZAround 735gAround 774gAround 820g
RFAround 709gAround 758gAround 806g
LAround 690gAround 744gAround 792g
35mm T2.1
ABC
E60mm25mm81mm
X58mm25mm81mm
Z62mm27mm83mm
RF66.5mm23mm79mm
L63.5mm23mm79mm
50mm T2.1
ABC
E59.5mm26.5mm92mm
Z65mm28.5mm94mm
RF64.5mm24mm89.5mm
L61.9mm24.5mm90mm
85mm T2.1
ABC
E59.5mm26.6mm101.1mm
Z65mm28.6mm103.1mm
RF64.5mm24.1mm98.6mm
L61.9mm24.6mm99.1mm

Posted in 3rd Party Lens| Tagged , , , , , , , , , | 13 Comments