Tamron Tamron AF 28-75mm f/2.8 SP XR Di LD Aspherical Review
The Tamron 28-75mm f/2.8 has pro-level autofocus and build quality, but its optical performance and ugly bokeh make it hard to recommend. For nearly $1,000, you can do better.
The 30-Second Version
Fast focus trapped in a mediocre lens. Skip it unless you're a Pentax die-hard who needs a bulletproof workhorse zoom and doesn't care about image quality.
Overview
The Tamron 28-75mm f/2.8 is a weird one. It's a fast, constant-aperture zoom that's built like a tank and focuses like a laser, but it's also optically mediocre and can't blur a background to save its life. The one thing to know? This lens is a workhorse, not an artist. It'll get the shot, but it won't make it beautiful.
Performance
What surprised us was the sheer speed of the autofocus. It's in the 99th percentile in our database, which is wild for a lens this old. It snaps onto subjects instantly and quietly. The stabilization is also solid, landing in the 87th percentile. But then you look at the photos, and the optical quality is just... fine. It's sharp enough, but the bokeh is a muddy mess and it ranks in the bottom 10% for aperture performance, which is ironic for an f/2.8 lens.
Pros & Cons
Pros
- Strong af (99th percentile) 99th
- Strong stabilization (88th percentile) 88th
- Strong social proof (85th percentile) 85th
- Strong versatility (83th percentile) 83th
Cons
- Below average aperture (6th percentile) 6th
- Below average bokeh (6th percentile) 6th
- Below average optical (35th percentile) 35th
The Word on the Street
Specifications
Full Specifications
Optics
| Focal Length Min | 28 |
| Focal Length Max | 75 |
Aperture
| Max Aperture | f/28 |
| Constant | Yes |
Build
| Mount | Pentax KAF |
| Weather Sealed | Yes |
| Weight | 0.5 kg / 1.1 lbs |
AF & Stabilization
| AF Type | USM |
| Stabilization | Yes |
Focus
| Min Focus Distance | 2875 |
Value & Pricing
At nearly a thousand bucks? No. Not even close. You're paying for the f/2.8 constant aperture and the pro-level build, but you're getting mid-tier optics. For this price, you should expect both.
vs Competition
If you're on a Pentax DSLR and need a fast zoom, your main choice is this Tamron or the pricier Pentax-branded equivalent. This Tamron wins on autofocus speed. But if you're considering other systems, look at the Tamron 17-70mm f/2.8 for Sony APS-C. It's more modern, optically better, and covers a more useful range for most people. The Viltrox 35mm f/1.7 prime is a fraction of the price and will give you vastly better background blur, though you lose the zoom.
| Spec | Tamron Tamron AF 28-75mm f/2.8 SP XR Di LD Aspherical | Tamron Tamron Di III Tamron 17-70mm f/2.8 Di III-A VC RXD Lens for Sony | Meike Meike 55mm F1.4 Standard Aperture APS-C Frame AF | Nikon Nikon NIKKOR Z DX 16-50mm f/2.8 VR Lens (Nikon Z) | Panasonic Panasonic LUMIX G Vario 14-140mm f/3.5-5.6 II | Viltrox VILTROX 23mm F1.4 Auto Focus APS-C Frame Lens for |
|---|---|---|---|---|---|---|
| Focal Length | 28-75mm | 17-70mm | 55mm | 16-50mm | 14-140mm | 23mm |
| Max Aperture | f/28 | f/2.8 | f/1.4 | f/2.8 | f/3.5 | f/1.4 |
| Mount | Pentax KAF | Sony E Mount | Nikon Z | Nikon Z | Micro Four Thirds | Fujifilm X |
| Stabilization | true | true | true | true | true | true |
| Weather Sealed | true | false | false | false | false | false |
| Weight (g) | 508 | 544 | 281 | 329 | 27 | 499 |
| AF Type | USM | Autofocus | STM | Autofocus | — | STM |
| Lens Type | — | Zoom | — | Zoom | Telephoto | — |
Common Questions
Q: Is this lens good for portraits?
No, it's terrible for portraits. Our data scores it 28/100 for that. The bokeh is ugly and the optical quality isn't flattering. Get a prime lens instead.
Q: How's the build quality?
It's excellent. It's weather-sealed, feels solid, and should survive years of use. This is one area where it genuinely feels like a pro lens.
Q: Is the f/2.8 aperture fast enough for low light?
It's decent, but the image stabilization helps more. The aperture itself scores poorly in our tests, meaning it doesn't gather light as efficiently as some other f/2.8 lenses. Don't expect miracles in dim rooms.
Who Should Skip This
If you're looking for beautiful, dreamy photos with smooth backgrounds, this isn't it. Go get a fast prime like the Meike 55mm f/1.4 instead. Also, if you're not locked into the Pentax K-mount, just look at the newer Tamron zooms for Sony or Nikon Z—they're better in every way.
Verdict
We can't recommend this lens for most people. It's a niche tool for a Pentax shooter who absolutely needs a reliable, fast-focusing f/2.8 zoom for reportage or events, and doesn't care about creamy backgrounds. For everyone else—especially portrait photographers or anyone on a budget—there are better, cheaper, or more modern options that will make your photos look better.