The 23-33 mm middle frames closest to how you naturally see, and it is optically strong. This is your street, travel, documentary and group-photograph range — and the range where you should stop thinking about the lens at all.
35-50 mm equiv. approx. f/4.5 wide open at 28 mm f/5.6-f/8 for peak
Why this range is the workhorse
At 23 mm you are at the classic 35 mm-equivalent reportage view: wide enough to include context, narrow enough that the frame is about one subject. At 33 mm you are at 50 mm equivalent, the “normal” view. Optically the lens is still strong here — good in the centre, sensible at the edges even wide open — and stopping down to f/5.6 or f/8 makes it better still.
| Use | Focal length | Aperture | Note |
|---|---|---|---|
| Street, one subject in a scene | 23 mm | f/8 | Deep enough that focus errors forgive you |
| Travel, general walking around | 23-27 mm | f/5.6 | The range to leave the lens at |
| Group of three or four | 23-27 mm | f/8 | Step back rather than going wider, or the end faces stretch |
| Food, one dish from above | 27-33 mm | f/5.6 | Less distortion of the plate’s shape than at 15 mm |
| Documentary detail | 33 mm | f/5.6-f/8 | Natural perspective, honest scale |
A single-focal-length exercise worth a month
Set the lens to 23 mm and leave it there for a whole week of photographs. Move your feet instead of the ring. You will learn framing faster than any zoom lens will teach you, and you will discover which of your photographs actually needed a different focal length.
Assignment: the same story twice
Photograph a single scene — a market stall, a kitchen, a shopfront — as a set of five frames at 23 mm only. Then repeat the same five frames at 15 mm and at 45 mm. Lay all fifteen out together. The middle set will feel the most like what it was like to be there, and that is the thing worth knowing about this range.