Quick Answer: The Fellow Opus ($199.95) is the all-purpose grinder that genuinely reaches espresso fineness without giving up drip, pour-over, or French press range — its 41mm C6-40 conical burrs span 41 stepped settings plus a micro-adjustment ring, and independent Kruve sifter testing by The Coffee Locator measured 85-90% particle uniformity at filter settings across 500-plus grinds. Retention runs 0.2-0.3g per dose, and a full 18-gram espresso dose grinds in 15-18 seconds, per that same testing. It’s not a dedicated espresso grinder, but for one machine that covers everything, it’s the pick.
Most all-purpose grinders make you choose: fine enough for espresso, or wide-ranging enough for drip and French press, rarely both. The Opus was built specifically to close that gap, and it’s become Fellow’s answer for anyone who doesn’t want two grinders taking up counter space. Below is the full rundown on what it costs, how it performs by independent test data, and how it stacks up against the Baratza Encore and Breville Smart Grinder Pro. (Shopping the whole all-purpose category first? See our best coffee grinder guide, or if espresso is your only use case, our dedicated best espresso grinder roundup.)
Fellow Opus, by the numbers
| Spec | Fellow Opus |
|---|---|
| Price | $199.95 |
| Burrs | 41mm conical steel, "C6-40 Burly Burrs" |
| Motor | 140W, burrs spin at 350 RPM |
| Grind range | Cold-brew coarse to espresso-fine (under 200 microns) |
| Adjustment | 41 stepped settings plus a micro-adjustment ring |
| Hopper | Removable 110g single-dose hopper |
| Timed cycles | 30, 60, 90, 120 seconds with auto-shutoff |
| Includes | Grounds catch bin with interchangeable brew/espresso lids, portafilter attachment |
| Warranty | 2 years, per Fellow |
The number worth anchoring on is 85-90% — that’s the particle uniformity The Coffee Locator’s SCA-certified testing measured on a Kruve sifter at filter-brew settings, across more than 500 individual grinds over 60 days of daily use. At espresso settings, that consistency dropped to a still-respectable 80-85%, with what the review called “manageable fines” — the tradeoff every all-purpose grinder makes for also covering the coarse end of the range.
The Opus, tested
Fellow Opus
- 41mm conical burrs grind fine enough for true espresso, coarse enough for French press.
- Independent testing measured 0.2-0.3g retention — under 2% of an 18g espresso dose.
- 41 stepped settings plus a micro-adjustment ring for fine-tuning a specific shot.
- Programmable 30/60/90/120-second timed cycles with auto-shutoff.
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In daily use, the Opus earns its “all-purpose” label by actually delivering on both ends of the grind spectrum instead of compromising toward the middle. The 41mm C6-40 burrs — Fellow’s own name for the conical steel set — spin at 350 RPM off a 140-watt motor, and the 41-position stepped dial plus a separate micro-adjustment ring gives enough resolution to land a genuinely dialed-in espresso setting, not just a rough approximation. The removable 110g hopper is sized for single-dosing rather than sitting full for days, which keeps beans fresher between grinds than a large gravity-fed hopper.
Retention is where independent testing found the most concrete improvement over a typical hopper-fed grinder: The Coffee Locator measured 0.2-0.3g retained per dose, alongside anti-static scatter of just 0.15-0.2g versus 0.5-1.0g on comparable grinders in the same test. Neither number touches a true single-dose grinder like the Niche Zero, but for a $200 all-purpose machine, it’s a meaningful step up from grinders that leave a noticeable pile of stale grounds behind the burr chamber. Grind speed clocked in at 15-18 seconds for a full 18-gram espresso dose and 25-30 seconds for a 30-gram filter dose — quick enough that timing your grind isn’t a daily annoyance. The one tradeoff of that speed and range: at 70-75 dB, it isn’t a quiet grinder, so early-morning grinding in a shared house is worth planning around.
Fellow has since released an Opus 2 with larger 48mm burrs and a redesigned stepless adjustment, aimed squarely at static and retention complaints some early Opus buyers raised. The original Opus reviewed here is still widely sold at its original price and remains the better value if those specific fixes aren’t dealbreakers for you.
How it compares
| Fellow Opus | Baratza Encore | Breville Smart Grinder Pro | |
|---|---|---|---|
| Price | $199.95 | ~$150 | ~$200 |
| Burrs | 41mm conical steel | 40mm conical steel | 40mm conical steel |
| Settings | 41 + micro-adjust ring | 40 | 60 |
| Reaches espresso fineness | Yes | No | Yes |
| Hopper style | 110g single-dose | Standing hopper | Standing hopper with digital dosing |
| Best for | Widest range in one grinder | Drip/pour-over/French press only | Digital timed dosing |
- Get the Fellow Opus if you want the widest genuine grind range in a single $200 grinder, including real espresso fineness — see our full best coffee grinder roundup for how it stacks up against every all-purpose pick.
- Get the Baratza Encore instead if espresso is rare in your routine and you’d rather save roughly $50 on a simpler, standing-hopper grinder.
- Consider the Breville Smart Grinder Pro if repeatable digital timed dosing matters more to you than the Opus’s single-dose hopper design.
Who should buy it
Buy the Fellow Opus if you want one grinder for everything — dialed-in espresso most mornings, French press on the weekend — and don’t want to own two separate machines to cover that range. It’s also the pick if you’ve outgrown a blade grinder or an entry-level burr grinder and espresso is now part of the routine, since the Opus is one of the few all-purpose grinders that actually gets fine enough to matter for a shot.
Skip it if espresso will never be part of your setup — the Baratza Encore covers drip, pour-over, and French press for about $50 less without the extra range you wouldn’t use. And if espresso is your primary or only brew method, a dedicated pick from our best espresso grinder guide, like the DF64 Gen 2 or Eureka Mignon Specialita, will out-perform any all-purpose grinder at the fine end.
The bottom line
The Fellow Opus is the grinder to buy when you need one machine that genuinely covers espresso through French press, not just a compromise that does neither particularly well. Independent testing backs that up: 85-90% particle uniformity at filter settings, 80-85% at espresso settings, and retention low enough that it doesn’t dominate the conversation the way it does on cheaper hopper-fed grinders. Pair it with a machine from our best espresso machine guide, or see the complete all-purpose field in our best coffee grinder roundup. If espresso ends up being your only real use case, our best espresso grinder guide covers the dedicated picks that will out-grind it at the fine end.