SG-image MF 75mm F1.2

Focal length: 75 mm
Aperture: f/1.2
Weight: 642 g
Filter diameter: 72 mm
Min. focus distance: 60 cm
Length: 83 mm

Overview

The SG-image MF 75mm F1.2 is a manual focus prime for medium format cameras. SG-image designed it for the Fujifilm G mount (GFX) and also for the Hasselblad X mount (XCD). Its headline feature is the F1.2 aperture, which SG-image describes as rare in medium format and says gives a depth-of-field blur equivalent to better than f/0.95 on full frame. The 75mm focal length and 35 degree angle of view make it a portrait and general short-telephoto lens on these large sensors.

Optical design

According to SG-image the lens has 7 elements in 6 groups, and the diagram marks several elements as high refractive index glass. The diaphragm has 12 blades and covers F1.2 to F16 on a graded aperture ring. The minimum focus distance is 0.6 m with a maximum magnification of 1:6.5. SG-image describes a painterly rendering with oil-painting-like out-of-focus transitions and says the lens is fully usable wide open. These are the manufacturer's statements and have not been tested here.

Focusing and handling

Focusing is manual, with what the manufacturer calls precise mechanical damping for smooth focus travel. The lens is not designed for autofocus, and the aperture is set on the lens ring. The product page shows a distance scale in feet and metres and an aperture scale from 1.2 to 16 on the barrel.

Build and size

The lens is all metal and weighs about 642 g, which SG-image presents as light for a medium format lens of this speed. It takes 72 mm filters. The dimension drawing shows 77 mm diameter and 83 mm length, but it is explicitly based on the XCD mount, so the GFX version may differ slightly.

Where it fits

Fujifilm's own GF 80mm F1.7 R WR in the database is the closest native option for the G mount, with autofocus, while the GF 63mm F2.8 R WR is a shorter and slower alternative. The SG-image trades autofocus for a very fast aperture. SG-image presents it as good value and states an official launch price of 499 US dollars, which can change.

Pros and cons

Pros

F1.2 aperture, very fast for medium format
12-blade diaphragm
Metal construction at a stated 642 g
Mechanical damping on the focus ring
Available for GFX and XCD

Cons

Manual focus only
72 mm filters and 83 mm length make it a sizeable lens
Length and diameter are given for XCD, GFX values are not separately stated
Quality claims come from the manufacturer only
No weather sealing mentioned

Verdict

The SG-image MF 75mm F1.2 offers a very bright manual portrait lens for GFX shooters who accept manual focus. It is an unusual option in medium format, and the right choice for photographers who value the look of a fast aperture over autofocus.

Technical Specifications

min focal length: 75 mm
max focal length: 75 mm
max f (min zoom): f/1.2
max f (max zoom): f/1.2
min. aperture: f/16
Elements: 7
Groups: 6
Weight: 642 g (1.42 lb)
Filter diameter: 72 mm
min focus distance: 60 cm (23.62 in)
Length: 83 mm (3.27 in)
Diameter: 77 mm (3.03 in)

Simulate depth of field and angle of view

Which cameras does the SG-image MF 75mm F1.2 fit?

The SG-image MF 75mm F1.2 fits all Fujifilm GFX cameras. There its field of view equals 59 mm in full-frame terms (crop factor 0.79).

Fujifilm GFX cameras

Medium format:: Fujifilm GFX ETERNA 55, Fujifilm GFX100S II, Fujifilm GFX100 II, Fujifilm GFX50S II, Fujifilm GFX100S, Fujifilm GFX100, Fujifilm GFX50R, Fujifilm GFX50S