Film comparison
Rollei/Maco Ortho 25 Plus vs Silberra Orta 50
- Orta 50 is a stop faster (ISO 50 vs 25).
- Orta 50 is harder to find.
Side by side
| Ortho 25 Plus | Orta 50 | |
|---|---|---|
| Manufacturer | Rollei/Maco | Silberra |
| Type | Black & white | Black & white |
| Box speed | ISO 25 | ISO 50 |
| Process | B&W | B&W |
| Formats | 35mm, 120, 4x5 | 35mm |
| Grain | Very fine | — |
| Contrast | — | — |
| Latitude | — | — |
| Saturation | — | — |
| Price, 35mm | — | — |
| Price, 120 | — | — |
| Availability | Current | Limited |
Rows that differ are in bold. Prices are typical UK prices and change often.
How they look
- Ortho 25 Plus
- Very fine grained, high-resolution orthochromatic film; replaced Rollei Ortho 25 in 2017.
- Orta 50
- Orthochromatic (red-blind) film with high resolution and high contrast.
Which suits what
Better pick: Ortho 25 Plus
Architecture, Copy work, Portraits
Both work well
—
Better pick: Orta 50
General
Long exposures (reciprocity)
| Metered | Ortho 25 Plus | Orta 50 |
|---|---|---|
| 1s | 1s | No data |
| 10s | 20s | No data |
| 30s | 1m 15s | No data |
| 2m | 6m | No data |
Corrected exposure from each film’s published reciprocity data. Reciprocity calculator