Head-to-head · Best Wide-Angle Lenses for Sony E-Mount

Sony FE 20mm F1.8 G vs Tamron 17-28mm F2.8 Di III RXD

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

Sony FE 20mm F1.8 G and Tamron 17-28mm F2.8 Di III RXD score essentially the same (4.7 vs 4.7). Pick the one whose trade-offs match your priorities — the strengths and watch-outs below are where they actually differ.

Sony FE 20mm F1.8 G

Ranked #5 in Best Wide-Angle Lenses for Sony E-Mount

Sony FE 20mm F1.8 G

4.7

$898

The 20mm f/1.8 G is the versatile wide prime. Bright enough for astro and low light, wide enough for landscapes and architecture, but tighter than the 14mm GM so it pulls double-duty for environmental portraits. 373g makes it the lightest wide lens in this lineup — easy to carry all day. For travel and walkabout shooters who want one wide prime that handles everything from indoor low-light to night sky to landscapes, this is the right pick.

Strengths

— Bright f/1.8 aperture at 20mm — versatile for astro, low-light landscape, and environmental portraits
— Lightweight 373g — easiest wide lens here to carry all day
— Dual XD Linear Motors deliver fast, silent autofocus

Watch-outs

— 20mm is wide but not ultra-wide — less dramatic than the Sony FE 14mm GM
— Prime lens — single focal length
— Not as bright as the Sony FE 14mm f/1.8 GM (same aperture, narrower angle)

$898 · Check Price on Amazon Full review →

Ranked #3 in Best Wide-Angle Lenses for Sony E-Mount

Tamron 17-28mm F2.8 Di III RXD

4.7

$899

The Tamron 17-28mm is the value champion. At $899 it's less than half the Sony FE 16-35mm GM II's price, with image quality that holds up at every focal length except the missing 28-35mm range. For landscape, astro, and architecture shooters who don't need the GM II's edge-case features, this is the right Sony E-mount wide zoom buy. Lighter than the Sony GM II by 127g and far cheaper than every other pick in this lineup.

Strengths

— 420g — 23% lighter than the Sony FE 16-35mm GM II at less than half the price
— 67mm filter size accepts standard filter kits (vs Sony GM II's 82mm)
— Excellent corner-to-corner sharpness with virtually no color fringing

Watch-outs

— 17-28mm range is narrower than the Sony GM II's 16-35mm
— RXD motor is slower-focusing than Sony's XD Linear motors in the GM II
— Build quality feels less premium than the Sony GM lenses

$899 · Check Price on Amazon Full review →

How they stack up

Sony FE 20mm F1.8 G

Best all-purpose wide prime. Narrower angle than the Sony FE 14mm GM (20mm vs 14mm) but at less than half the price. Brighter aperture than the Sony FE 16-35mm GM II, Tamron 17-28mm, and Sigma 16-28mm (f/1.8 vs f/2.8). Lightest wide lens in this lineup at 373g.

Tamron 17-28mm F2.8 Di III RXD

Best value pick. Narrower zoom range than the Sony FE 16-35mm GM II (17-28 vs 16-35) but at less than half the price. Compared to the Sigma 16-28mm, slightly less wide on the short end but similar pricing and build philosophy. Less focal flexibility than the Sony GM II but lighter and cheaper.

Specs side-by-side

Spec	Sony FE 20mm F1.8 G	Tamron 17-28mm F2.8 Di III RXD
Focal Length	20mm	17-28mm
Max Aperture	f/1.8	f/2.8 constant
Weight	373g	420g
Min Focus Distance	0.19m	0.19 m
AF Motor	Dual XD Linear	RXD
Filter Size	67mm	67mm
Mount	Sony FE (full-frame)	Sony FE (full-frame)
Length	—	99mm

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