Sigma Patent for 24-105mm f/2.8-4 DG OS HSM Art Lens

Sigma has filed a new patent in Japan. The new patent refers to a Sigma 24-105mm f/2.8-4 DG OS HSM Art lens designed for DSLR cameras with full-frame image sensors.

Sigma announced and added the 24-105mm f/4 DG OS HSM Art full frame lens to their lineup in late 2013.

Now a more bright aperture at 24mm focal length version appeared in a filed patent.

See below for patent details.

Sigma 24-105mm f/2.8-4 DG OS HSM Art Lens Patent

This is the current Sigma 24-105mm f/4 DG OS HSM full-frame standard zoom lens with optical image stabilisation and a quiet “hypersonic” focus motor.

Explanation self interpretation of patent literature

• Patent Publication No. 2015-55858
  • Published 2015.3.23
  • A willing Day 2013.9.13
• Example
  

  embodiment

  Example	Focus distance	Fno.	Picture angle	Full length	BF	Lens constitution	Aspheric	FLD	ELD	SLD
  1	24.85 52.75 117.06	4.06 4.00 4.07	83.81 42.94 20.24	152.73 172.00 199.28	38.6526 54.4039 68.5866	15 20 sheets group	Four faces three	1	1	0
  2	24.86 50.58 101.70	4.06 4.11 4.07	84.59 45.20 23.15	151.90 170.47 198.20	39.4591 59.1232 66.9314	14 group 19 sheets	Four faces three	2	0	2
  3	24.85 50.00 101.49	2.83 3.38 4.13	83.87 45.17 23.38	160.47 178.12 205.44	40.1490 53.3326 73.3220	13 group 17 sheets	Four faces three	1	4	0
  4	24.53 50.54 103.51	4.06 4.07 4.09	84.70 45.20 23.12	147.52 168.19 195.53	38.6549 67.5706 55.1266	14 group 18 sheets	Four faces three	1	2	0

  Like high Y = 21.63mm

• Sigma patents
  • Positive and negative positive and negative positive 5-group zoom
  • Anti-vibration (part of group 4)
  • Inner focus (the second group)

via Egami