Panasonic Lumix G VARIO H-FSA100300 100-300mm

The Panasonic 100-300mm f/4.0-5.6 II has autofocus in the 98th percentile and stabilization in the 97th percentile, which is frankly ridiculous for a lens this cheap. It's sharp, lightweight at 522g, and weather-sealed. But the f/4.0-5.6 aperture is slow and the bokeh is weak, so it's a daylight wildlife lens, not an all-rounder.

The headline here is the 240 fps linear motor driving the autofocus. That's the kind of speed you'd expect from a much more expensive lens, and it shows in our 98th percentile AF ranking. In practice, that means the lens can track a moving subject with impressive tenacity, which is exactly what you want for wildlife and sports. The stabilization is nearly as impressive at the 97th percentile, with Panasonic claiming 5 stops of correction. Pair it with a Lumix body that has in-body stabilization and you get dual IS, which owners consistently mention as a real-world game changer for handheld shooting at 300mm.

Optically, the lens is solid but not spectacular. It's in the 79th percentile overall, with 17 elements in 12 groups and one ED element to control chromatic aberration. Sharpness is good across most of the range, though it softens a bit at the long end, which is typical for budget telephotos. The 7-blade diaphragm is fine, but the f/4.0-5.6 maximum aperture means you'll be cranking ISO or dropping shutter speed in anything less than bright daylight. The 0.21x magnification puts it in the 29th percentile for macro, so don't expect to fill the frame with a butterfly.

Against the Tamron Di III VC 28-300mm f/4-7.1, the Panasonic offers better stabilization and a faster aperture at the long end, but the Tamron covers a much wider range. The Sigma Contemporary 18-50mm f/2.8 is a completely different beast, a fast standard zoom that will crush the Panasonic in low light and bokeh but can't touch it for reach. The Sony E 18-135mm f/3.5-5.6 OSS is the closest competitor in spirit, a versatile all-rounder, but it tops out at 135mm while the Panasonic goes to 300mm. For pure telephoto reach on Micro Four Thirds, the Panasonic's effective 200-600mm full-frame equivalent field of view is hard to beat at this price. The Viltrox AF 13mm F1.4 and Nikon NIKKOR Z 17-28mm f/2.8 aren't even in the same conversation, they're wide-angle lenses for completely different jobs.

This is where the lens gets interesting. US prices range from USD 377 to USD 748 across 9 listings, which is a massive spread for the same piece of glass. At the low end, you're getting a weather-sealed telephoto with best-in-class AF and stabilization for less than the cost of a decent prime. At the high end, you're paying nearly double for the same optics, which makes a lot less sense. The budget score of 74.5/100 reflects that tension. If you can find it near the USD 377 mark, it's a steal. If you're looking at the USD 748 listing, you should probably keep scrolling. The CAD 700 listing from Canada is a single data point, but it suggests international buyers may not get the same bargain pricing.

The Panasonic Lumix G VARIO 100-300mm f/4.0-5.6 II is a telephoto zoom that punches way above its weight class in two areas: autofocus and stabilization. Our database puts its AF system in the 98th percentile and its Power O.I.S. in the 97th percentile, which means this lens is essentially best-in-class for tracking moving subjects and keeping shots steady. That's a big deal for a lens that weighs just 522g and costs well under a grand on the used market.

But the numbers also tell a more complicated story. The aperture sits in the 21st percentile, which is polite database-speak for "slow." At f/4.0-5.6, you're not getting much light through this thing, and the bokeh ranking lands in the 14th percentile. So while it's a fantastic wildlife and sports lens on paper, it's not going to give you creamy backgrounds or low-light heroics. The user sentiment score of 82/100 backs up the mixed picture: owners love the reach and sharpness, but a few have hit real autofocus frustrations with birds in flight.

If you shoot in low light, skip this lens. The f/4.0-5.6 aperture sits in the 21st percentile, which means you'll be fighting for light the moment the sun dips below the horizon. Portrait shooters should also look elsewhere, the 14th percentile bokeh ranking means backgrounds will look busy and distracting rather than creamy. And if you're primarily interested in macro work, the 0.21x magnification and 29th percentile macro score won't get you close enough. The 1500mm minimum focus distance is also a real limitation for anything smaller than a large bird or mammal. Finally, if you shoot birds in flight specifically, the mixed autofocus reports from owners suggest you might want to test this lens before committing.

The Panasonic Lumix G VARIO 100-300mm f/4.0-5.6 II is a specialist's lens that happens to be cheap enough for casual shooters. The 98th percentile AF and 97th percentile stabilization are genuinely exceptional, and the 522g weight makes it a joy to carry on long hikes. But the slow aperture and weak bokeh mean it's a daylight lens, full stop. The 82/100 user sentiment score and 4.5/5 rating from 399 reviews suggest most owners are happy, but the recurring autofocus complaints with birds are worth taking seriously. If you shoot wildlife in good light and want maximum reach per dollar, this is one of the best options on Micro Four Thirds. If you need low-light performance or creamy backgrounds, look elsewhere.