Sony’s New 400mm and 600mm GM E-Mount Primes: Which One for Wildlife?

Le contenu de mon articleThe confirmed specifications

Sony announced two unusual full-frame E-mount primes on 15 September 2026: the FE 400mm F4.5 GM OSS and the FE 600mm F6.3 GM OSS. The headline is not only the focal length. Sony lists both lenses at approximately one kilogram, excluding the tripod foot, which changes the practical question from “Can I carry a 600mm?” to “Which focal length fits my subjects and working distance?”

• FE 400mm F4.5 GM OSS: approximately 994g; a useful starting point for larger wildlife, field sports and scenes where some environment matters.

• FE 600mm F6.3 GM OSS: approximately 995g; more specialised for birds, smaller subjects and greater working distance.

• Both lenses include optical stabilisation, XD linear motors, dust- and moisture-resistant construction and support Sony’s 1.4x and 2x teleconverters.

Sony lists approximate European prices of €2,800 for the 400mm and €3,900 for the 600mm. Prices vary by country and retailer, so check them before buying.

What the hands-on reports add

Official specifications do not show how a lens behaves after several hours outside. DPReview handled and used both lenses for wildlife, noting that only 1g and 21mm separate them physically. The choice is therefore less about portability and more about framing, working distance and available light.

TechRadar reports carrying both lenses during several-hour sessions at a wetland reserve and a deer park, in bright daylight, light rain and fading light. Its practical conclusion is useful: the 400mm feels more natural for larger wildlife and environmental context, while the 600mm offers more reach for smaller or more distant subjects. That is a field observation, not a universal rule.

Digital Camera World also presents the pair as a portability-first alternative to Sony’s heavier professional primes. Its 600mm review highlights the value of the focal length and the lower carrying burden, while noting that a fixed focal length remains less flexible than a zoom.

400mm or 600mm?

The 400mm is the more forgiving option when a subject can approach, when the background is part of the composition or when tracking a moving subject matters more than maximum reach. It also gives more room for sports and wildlife whose distance changes quickly.

The 600mm is more specialised. It makes sense when the subject is small, distant or sensitive to the photographer’s presence. The trade-off is practical: framing is tighter, finding a moving subject requires more anticipation and the fixed focal length leaves less room when the subject suddenly comes closer.

Teleconverters add reach, but they do not turn either prime into a zoom. A 400mm with a 1.4x converter becomes a 560mm f/6.3 combination; a 600mm with the same converter becomes an 840mm f/9 combination. Autofocus and image quality will still depend on the camera body, light and subject.

Limits of the launch reviews

These are early hands-on reports, generally made with loan equipment before or around launch. They are useful for handling, autofocus impressions and sample images, but they do not replace a long-term reliability test or a controlled laboratory comparison. Sony’s “lightest in class” claim is a manufacturer claim based on its own September 2026 survey.

Sony’s dust- and moisture-resistance wording also matters: the lenses are designed for demanding outdoor use, but they are not completely immune to dust or water. Protect the equipment during sustained rain.

Bottom line

These lenses are not interchangeable in practice, even though they weigh almost the same. Choose the 400mm when framing flexibility and larger subjects matter most. Choose the 600mm when distance and subject isolation justify a tighter field of view. The notable change for Sony E-mount photographers is the lower carrying burden, not the disappearance of the usual trade-offs between reach, aperture, price and flexibility.

Sources

• Sony Europe — FE 400mm F4.5 GM OSS and FE 600mm F6.3 GM OSS announcement

• DPReview — hands-on comparison of the 400mm and 600mm GM lenses

• TechRadar — field test of the two Sony super-telephoto primes

• Digital Camera World — review of the Sony FE 600mm F6.3 GM OSS

Method note: official specifications come from Sony. Practical observations are attributed to the independent hands-on reports above. Eclat Photography has not tested these lenses.