Fujifilm G bayonet

G-bayonet mount of a Fujifilm GFX 50R camera

The G-bayonet is a lens mount system from the Japanese manufacturer Fujifilm . This digital camera system includes the GFX series medium format camera housing with a 43.8 mm × 32.9 mm sensor , which has been available since February 2017 . The format factor (English. Crop factor) related to the "full format" ( small picture format ) is approx. 0.79.

The flange focal length is 26.7 mm and the inside diameter is 65 mm. Information is transmitted purely electrically via 12 contacts.

Cameras (as of August 2020)

Fujifilm currently offers three cameras with the G bayonet:

Fujifilm GFX 50S
Fujifilm GFX 50R
Fujifilm GFX100

Lenses

Original lenses (as of August 2020)

Normal lens Fujinon GF 63 mm f / 2.8 R WR (50 mm 35mm equivalent)

Wide - zoom lens Fujinon GF 32-64 mm f / 4 R LM WR (26-51 mm film equivalent)

The following original lenses are available for the G bayonet:

GF 1.4 × TC WR teleconverter
GF 23 mm f / 4 R LM WR extreme wide-angle lens (corresponds to 18 mm small picture)
GF 30 mm f / 3.5 R WR wide-angle lens (equivalent to 24 mm small picture)
GF 32-64 mm f / 4 R LM WR wide-angle zoom (equivalent to 26-51 mm small picture)
GF 45 mm f / 2.8 R WR wide-angle lens (equivalent to 36 mm small picture)
GF 45-100 mm f / 4 R LM OIS WR (corresponds to 35.5-79 mm small picture)
GF 50 mm f / 3.5 R LM WR ("Pancake" in a particularly flat design; corresponds to 40 mm small picture)
GF 63 mm f / 2.8 R WR normal lens (corresponds to 50 mm small image)
GF 80 mm f / 1.7 R WR (equivalent to 63 mm small picture) announced for 2021
GF 110 mm f / 2 R LM WR portrait lens (equivalent to 88 mm small picture)
GF 120 mm f / 4 Macro R LM OIS WR macro lens (equivalent to 96 mm small picture); maximum reproduction ratio 1: 2; Close focus limit 45 cm.
GF 100-200 mm f / 5.6 R LM OIS WR Telezoom (corresponds to 79-158 mm small picture)
GF 250 mm f / 4 R LM OIS WR (corresponds to 198 mm small picture)

The manufacturer's abbreviations mean:

LM: linear motor
OIS: Image stabilization in the lens (English: optical image stabilizer)
R: aperture ring
WR: water repellent

GF lenses resolve up to 100 megapixels .

Third-party providers (as of August 2020)

The following third-party lenses are available for the G bayonet:

Venus Optics Laowa 17 mm f / 4 Ultra-Wide GFX Zero-D (rectilinear imaging, low distortion, focal length corresponds to 13.5 mm small image)
Mitakon Zhongyi Speedmaster 65 mm f / 1.4 (focal length corresponds to 51 mm small picture)
Mitakon Zhongyi Speedmaster 85 mm f / 1.2 (focal length corresponds to 67 mm small picture)
Kipon Iberit 75 mm f / 2.4 (focal length corresponds to 59 mm small picture)

Lens adapter

There are lens adapters available to use someone else to medium format lenses manufacturer of cameras with the Fujifilm G bayonet, for example for Hasselblad V , Pentax 67 or Mamiya 645. Also for the coupling of full-format system lenses such as Leica R or M , Canon FD or EF or Nikon F adapters are available. Because of the larger image circle of the medium format, however, vignetting can occur.

Special teleconverter adapters are available for some full-format bayonets , which allow use without vignetting. The focal length is extended by a factor of 1.4 in order to fully illuminate the larger medium format image circle; arithmetically the loss of a f-stop occurs .

They are all passive adapters, ie there is no electronic data transfer between the lens and the housing.

Individual evidence

↑ Format factor - ratio of the picture diagonal 35 mm format to the Fujifilm G sensor format: ${\ displaystyle {\ dfrac {\ sqrt {(24mm) ^ {2} + (36mm) ^ {2}}} {\ sqrt {(32 {,} 9mm) ^ {2} + (43 {,} 8mm) ^ {2}}}} \ approx 0 {,} 79}$
↑ Lenses for the GFX series
↑ Fuji.ch, abbreviation for Fujinon lenses from Fujifilm , accessed on December 26, 2019
↑ Mid-telephoto Macro Lens , accessed August 17, 2020
↑ Lars Theiss: Super wide angle for Fuji G: Laowa 4/17 mm Zero-D , fotoMagazin, August 2, 2019, accessed on October 21, 2019
↑ KIPON start to deliver 75 mm 2.4 lens for Fuji G mount medium format cameras , www.kipon.com, July 24, 2019, accessed October 21, 2019
↑ Justin Heyes: Laowa Magic Format Converter - Adapt Full Frame Lenses For The Fujifilm GFX Without Cropping , SLRLounge, 2017, accessed November 8, 2019

[1] Format factor - ratio of the picture diagonal 35 mm format to the Fujifilm G sensor format: ${\ displaystyle {\ dfrac {\ sqrt {(24mm) ^ {2} + (36mm) ^ {2}}} {\ sqrt {(32 {,} 9mm) ^ {2} + (43 {,} 8mm) ^ {2}}}} \ approx 0 {,} 79}$

[2] Lenses for the GFX series

[3] Fuji.ch, abbreviation for Fujinon lenses from Fujifilm , accessed on December 26, 2019

[4] Mid-telephoto Macro Lens , accessed August 17, 2020

[5] Lars Theiss: Super wide angle for Fuji G: Laowa 4/17 mm Zero-D , fotoMagazin, August 2, 2019, accessed on October 21, 2019

[6] KIPON start to deliver 75 mm 2.4 lens for Fuji G mount medium format cameras , www.kipon.com, July 24, 2019, accessed October 21, 2019

[7] Justin Heyes: Laowa Magic Format Converter - Adapt Full Frame Lenses For The Fujifilm GFX Without Cropping , SLRLounge, 2017, accessed November 8, 2019