OM System M.Zuiko 100-400mm f/5-6.3 IS II vs Panasonic Lumix G 100-300mm f/4-5.6 II

Both are Micro Four Thirds mount zooms for sports & action and telephoto — here's how the specs differ and which to pick. Every spec is from the manufacturer's own catalog.

Last verified 2026-06-21 · Micro Four Thirds mount · prices change — check the retailer

Spec	OM System M.Zuiko 100-400mm f/5-6.3 IS II	Panasonic Lumix G 100-300mm f/4-5.6 II
Focal length	100-400mm	100-300mm
Max aperture	f/5-6.3	f/4-5.6
Type	zoom	zoom
Coverage	Micro Four Thirds	Micro Four Thirds
Mount	Micro Four Thirds	Micro Four Thirds

Which should you buy?

the Panasonic Lumix G 100-300mm f/4-5.6 II opens wider (f/4-5.6) — brighter in low light and more background blur
the OM System M.Zuiko 100-400mm f/5-6.3 IS II covers 100-400mm and the Panasonic Lumix G 100-300mm f/4-5.6 II covers 100-300mm — pick the range that matches what you shoot

Where to buy

OM SYSTEM M.Zuiko Digital ED 100-400mm F5.0-6.3 is II Compact Tripod Mount Design Lens with 5-Axis Sync-is (Micro Four T

OM System M.Zuiko 100-400mm f/5-6.3 IS IISee price on Amazon

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Panasonic Lumix G 100-300mm f/4-5.6 IISee price on Amazon We could not find this one on Amazon US in Micro Four Thirds — this button runs an Amazon search for it rather than opening a product page.

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FAQ

What's the difference between the OM System M.Zuiko 100-400mm f/5-6.3 IS II and the Panasonic Lumix G 100-300mm f/4-5.6 II?
The OM System M.Zuiko 100-400mm f/5-6.3 IS II is 100-400mm f/5-6.3 zoom, Micro Four Thirds; the Panasonic Lumix G 100-300mm f/4-5.6 II is 100-300mm f/4-5.6 zoom, Micro Four Thirds. Both fit the Micro Four Thirds mount.

Which is better in low light, the OM System M.Zuiko 100-400mm f/5-6.3 IS II or the Panasonic Lumix G 100-300mm f/4-5.6 II?
The Panasonic Lumix G 100-300mm f/4-5.6 II — its f/4-5.6 maximum aperture lets in more light and gives more background blur than the f/5-6.3 of the other.

Do the OM System M.Zuiko 100-400mm f/5-6.3 IS II and Panasonic Lumix G 100-300mm f/4-5.6 II fit the same camera?
Yes — both are Micro Four Thirds mount lenses, so they fit OM System (Olympus) and Panasonic Lumix G Micro Four Thirds bodies.

Citing these specs? Go ahead — manufacturer data, last verified 2026-06-21. Copy a ready-made reference:

More Micro Four Thirds comparisons: Panasonic Leica DG 15mm f/1.7 vs Panasonic Lumix G 20mm f/1.7 II · Panasonic Leica DG 25mm f/1.4 II vs OM System M.Zuiko 20mm f/1.4 PRO · OM System M.Zuiko 17mm f/1.8 vs Panasonic Leica DG 15mm f/1.7 · OM System M.Zuiko 40-150mm f/2.8 PRO vs OM System M.Zuiko 150-600mm f/5-6.3 IS · all Micro Four Thirds lenses · all comparisons

OM System M.Zuiko 100-400mm f/5-6.3 IS IIAffiliate linkSee price on Amazon