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- Fellow Opus to 1Zpresso J-Ultra
Grinder conversion
Fellow Opus to 1Zpresso J-Ultra
A V60 grind of about 4.5 on a Fellow Opus is roughly 2.2.8 on a 1Zpresso J-Ultra. Both land near 560 µm, a medium-fine grind.
Settings by brew method
| Brew method | Fellow Opus | 1Zpresso J-Ultra |
|---|---|---|
| Espresso~250 µm | 1.25 | 1.0.2 |
| Moka pot~350 µm | 2.25 | 1.4.2 |
| AeroPress~450 µm | 3.25 | 1.8.3 |
| V60~560 µm | 4.5 | 2.2.8 |
| Chemex~700 µm | 6 | 2.8.5 |
| French press~900 µm | 8.25 | 3.6.6 |
| Kalita Wave~600 µm | 5 | 2.4.4 |
| Cold brew~1100 µm | 10.25 | 4.4.7 |
| Siphon~650 µm | 5.5 | 2.6.4 |
Both grinders are mapped to one particle-size scale, fitted from the Honest Coffee Guide's per-method charts. It is not manufacturer burr-gap data, so treat this as a starting point and adjust by taste.
Go the other way
More about these grinders
- Fellow OpusSettings for every brew method
- 1Zpresso J-UltraSettings for every brew method
- Compare themStep size and settings side by side
Questions
Is 4.5 on a Fellow Opus the same as 4.5 on a 1Zpresso J-Ultra?
No. The two grinders count in different steps, so the same number gives a different grind. 4.5 on the Fellow Opus matches about 2.2.8 on the 1Zpresso J-Ultra.
How accurate is this conversion?
It is a starting point. Both grinders are mapped to particle size in microns, fitted from the Honest Coffee Guide charts for each brew method, not from manufacturer burr-gap specs. Beans, roast and burr wear change the result, so adjust by taste.
The coffee tastes sour or bitter after converting. What should I change?
Sour and thin: grind finer by a step or two. Bitter and harsh: grind coarser. Change one thing at a time.
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