A Leica R 90mm f/2 gathers about one stop more light than an f/2.8 version, and it is usually larger and heavier. Both are manual-focus short telephoto lenses well suited to portraits and details. Choose the f/2 for low light and a softer background, and the f/2.8 for easier carry.
What Each Lens Is
In the R system, the 90mm focal length appeared as the Summicron-R at f/2 and the Elmarit-R at f/2.8. Each was made in more than one generation, so details such as size and optical layout vary by version. We have not used these lenses ourselves, so confirm specifics with a Leica R reference.
Side by Side
| Trait | 90mm f/2 | 90mm f/2.8 |
|---|---|---|
| Light gathering | Greater | Moderate |
| Size and weight | Bigger, heavier | Lighter, more compact |
| Background blur wide open | Smoother, more pronounced | Gentler |
| Best suited to | Portraits, dim rooms | Travel, daylight portraits |
Choosing for Portraits
At 90mm, faces look natural and background separation is easy. The f/2 lens makes the subject stand out more at a given distance and lets you keep shutter speeds up indoors. The f/2.8 lens still separates a subject well, and at f/4 to f/5.6 both lenses are often at their crispest as a general guide.
- Choose the f/2 for evening, indoor or event portraits.
- Choose the f/2.8 if you travel light or shoot mostly outdoors.
- Choose either for detail shots, since both focus relatively close for their class.
Shooting Tips
- Use a shutter speed of roughly 1/125 or faster for handheld portraits as a rough guide for a 90mm lens, and go faster if your subject moves.
- Turn on focus peaking or magnified view when using an adapter, since focus is manual.
- Focus on the nearest eye and shoot a few frames, because depth of field is thin at close range.
- Use a lens hood to reduce flare when shooting toward the light.
Condition Checks
Look for clear glass without haze, a smooth focus helicoid and clean aperture blades. Ask for sample photos from the exact copy and compare them with samples of the same version. Check the adapter you plan to use as well, since barrel shape and mount type can affect fit.
FAQ
Is the f/2 lens much bigger than the f/2.8?
Usually it is larger and heavier, though the exact difference depends on the version. Check dimensions for the specific lens.
Which is better for video?
Either can work with manual focus. The f/2 allows lower light use, while the f/2.8 is lighter on a gimbal or small rig.
The Short Version
Choose the f/2 for low light and stronger subject separation, and the f/2.8 for a lighter, more portable lens. Confirm exact versions and details using the maker’s archive or a respected Leica R guide.
