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Reference no. OM-SYSTEM-100-400MM-F-5-6-GM-77
OM System

100-400mm f/5.6 GM

MFT mount · 100–400 mm · f/5.6

01
Mount
MFT
02
Focal length
100–400 mm
03
Max aperture
f/5.6
04
Weight
1296 g
05
Filter thread
77 mm
06
Stabilisation
Yes
07
Weather sealed
Yes
Live pricing
opens at retailer

Prices vary daily. Check current cost for OM System 100-400mm f/5.6 GM directly at each retailer.

Check price at Amazon →Check price at B&H Photo →Check price at Rent (LensRentals) →
05 — Chapter

Performance by subject

04 — Chapter

Reference notes

I

Overview

The OM System 100-400mm f/5.6 GM is a 100–400mm zoom for MFT mount at f/5.6, weighing 1296g. It includes optical stabilization. The body is weather-sealed for outdoor use.

II

Intended user

  • — Center sharpness enthusiasts
  • — Build quality enthusiasts
  • — Sports shooters
  • — Fans of professional
III

Advantages

  • Center sharpness — 95/100
  • Build quality — 95/100
  • Sports — 90/100
IV

Trade-offs

  • Low-light performance — 10/100
  • Astrophotography — 20/100
  • Heavy at 1296g — noticeable on long handheld sessions.
  • Premium price at $4,579 new.
V

Field use

  • 01Freezing action at a match, a race, or wildlife at the edge of a park.
VI

Buying advice

New price sits around $4,579. Rentals run about $173/day. Buying breaks even after roughly 26 rental days — try it before you commit if you're unsure. The used market for this lens is usually healthy — a lightly-used copy can save 20–30%.

VII

Alternative options

06 — Chapter

Reviewer consensus

Aggregate up to 20 independent YouTube reviews into a single consensus profile: score, confidence, pros, cons, and best use cases.

08 — Chapter

Same mount, related

09 — Appendix

Further viewing

Independent reviews and field tests for OM System 100-400mm f/5.6 GM, opened on YouTube.