DF54 vs Fellow Opus 2

The DF54. Its 54mm stainless flat burrs and fully stepless dial are built around espresso first — Turin pitches its stepless collar at fine shot-to-shot adjustment — and it scores 86 for espresso range here against the Opus 2's 78. The Opus 2 does grind fine enough for espresso, and its espresso catch cup fits both 54mm and 58mm portafilters, but its 48 settings plus a stepless side dial are spread across the whole espresso-to-cold-brew range, so there is less room to fine-tune at the espresso end. If you pull shots every day, buy the DF54; if espresso is occasional, the Opus 2 covers it.

It is closer than for espresso — both score 86 for brew range here. The DF54's flat burrs are the choice if you brew light roasts and want the most clarity in the cup, which is how Turin pitches it. The Opus 2 is the easier daily filter grinder: it takes a 100 g load, so you can grind for a full carafe in one go, and it stops itself when the beans run out. The DF54 is single-dose, with a 20 g hopper (50 g with the bellows), so grinding for a big batch means several loads.

Both makers claim very little. Turin designs the DF54 for single dosing and includes a bellows to blow out whatever is left in the chute, though it says it does not promise exactly zero retention. Fellow describes the Opus 2 as near-zero retention, using an internal impeller and anti-static design to clear the grind path. The DF54 scores higher on retention here, 84 against 72, because a single-dose flat-burr grinder with a bellows is purpose-built for it, while owner reviews of the Opus 2 still mention some static and grounds clinging in the chute.

The Opus 2 — it scores 78 for noise here against the DF54's 72. Neither Fellow nor Turin publishes a decibel figure, so this rests on owner reports rather than a spec sheet, and neither is a silent grinder. If a quiet kitchen at 6am is a priority, that tips toward the Opus 2; if the grind is the priority, the difference is small enough to live with.

The Opus 2 has 48 numbered settings plus a stepless side dial for fine-tuning between them, per Fellow, so it is easy to switch between espresso and filter and land back on a known number. The DF54 is fully stepless with no clicks at all: Turin's stepless collar adjusts between its marked positions, and Turin says there is no universal espresso dial number. Stepless gives you infinite adjustment for dialling in shots, but you need to note the dial position yourself if you swap between brew methods.

It can go coarse, but it is not its strength. Turin says its espresso burrs can also grind for French press, but it recommends a dedicated brew burr set when filter is your main method, and the grinder is designed espresso-first. Fellow explicitly lists French press and cold brew for the Opus 2, which also takes a 100 g load for a big cold-brew batch in one go. If coarse brewing is a big part of your week, the Opus 2 is the safer fit.

The Opus 2, the second-generation model and the one currently sold. Fellow's update moved to 48mm stainless conical burrs, added the stepless side dial alongside 48 settings, an auto-stop that senses when the beans are done, and an espresso catch cup that fits 54mm and 58mm portafilters. If you are weighing the DF54 against an original Opus bought second hand, note that every spec on this page is the Opus 2's.

The Opus 2 is the smaller and lighter of the two: Fellow lists it at about 10.5 inches tall, 5.1 wide and 8.1 deep, weighing 5.1 lb. Turin lists the DF54 at about 12 inches tall, 4.5 wide and 7 deep, weighing 10 lb. Both fit under most wall cabinets, but measure if yours are low, and remember the DF54's bellows sits on top of the hopper when fitted.