Question 1

How does the Sony FE 400mm f4.5 GM differ from the Sony FE 400mm f2.8 GM?

Accepted Answer

The main differences are maximum aperture, size and weight. The 400mm f4.5 GM measures 108 x 242mm and weighs 994g excluding the tripod foot, compared with 158.1 x 359mm and 2,895g for the 400mm f2.8 GM. The f2.8 provides the brighter maximum aperture, whereas the f4.5 reduces the weight by almost 2kg and is considerably shorter and narrower. Both are G Master super-telephoto lenses, but the f4.5 is the more manageable option for photographers shooting handheld for longer periods or carrying their equipment.

Question 2

Are there any other lenses in Sony’s lightweight super-telephoto range?

Accepted Answer

Yes. The 400mm f4.5 GM launches alongside the 600mm f6.3 GM, giving photographers a longer option with the same emphasis on low weight. Both weigh less than 1kg excluding their tripod feet and share XD Linear Motor autofocus, Optical SteadyShot and teleconverter support. The 400mm offers a brighter f4.5 aperture, while the 600mm extends native reach to 600mm with a maximum aperture of f6.3.

Question 3

Is the Sony FE 400mm f4.5 GM compatible with teleconverters?

Accepted Answer

Yes. The lens is compatible with the SEL14TC 1.4x and SEL20TC 2x teleconverters. The 1.4x converter changes the combination to 560mm f6.3, while the 2.0x converter extends it to 800mm f9. This gives wildlife photographers additional reach for smaller or more distant subjects without changing to a longer lens.

Question 4

Is the Sony FE 400mm f4.5 GM weather sealed?

Accepted Answer

Yes. The lens features a dust- and moisture-resistant design, with sealed seams, silicone-rubber gaskets around the buttons and switches, and a rubber seal around the lens mount. However, the design is not guaranteed to be completely dust- or moisture-proof. A fluorine coating on the front element also repels water, oil and other contaminants, making the surface easier to clean.

Question 5

Is the Sony FE 400mm f4.5 GM compatible with filters?

Accepted Answer

Yes, the lens has a 95mm front filter thread. You can attach compatible screw-in filters directly to the lens. This includes commonly used options such as polarising and protective filters, without requiring a dedicated drop-in filter system.

Question 6

Can I use the Sony FE 400mm f4.5 GM on an APS-C camera?

Accepted Answer

Yes. As a Sony E-mount lens, the FE 400mm f4.5 GM can be used on compatible APS-C cameras as well as full-frame models. On an APS-C camera, it provides a 35mm-equivalent focal length of 600mm, giving wildlife and sports photographers a narrower field of view without using a teleconverter.

Sony FE 400mm f4.5 GM OSS Lens

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