Quick answer

Start by deciding whether you need an ultra-wide constant aperture for low-light work or a compact prime with a classic field of view. The Panasonic 10-25mm f1.7 Leica and the Olympus 17mm F1.8 II serve very different shooting styles.

Focal length range vs. speed trade-off

A zoom like the Panasonic 10-25mm f1.7 covers a versatile ultra-wide to normal range with a constant f/1.7 aperture, making it excellent for video and indoor work where you need both wide angle and low-light performance. The trade-off is size and weight — it's a larger lens that may feel front-heavy on smaller MFT bodies.

In contrast, a compact prime such as the Olympus 17mm F1.8 II gives you a classic 34mm equivalent field of view in a much lighter package. The fixed focal length means you can't zoom, but the lens is pocket-friendly and less intimidating for street or travel photography.

When a prime makes more sense than a zoom

If your main use is walkaround street photography or casual travel, the Olympus 17mm F1.8 II provides excellent image quality and a fast f/1.8 aperture in a lens you can carry all day. The prime is also less expensive, freeing budget for other gear like filters or a second body.

For event or video work where you need to frame shots quickly without swapping lenses, the Panasonic 10-25mm f1.7 zoom is more practical despite its higher cost and weight.

Decision rules for choosing a wide-angle zoom

  • Need ultra-wide zoom and low-light speed?: Choose the Panasonic 10-25mm f1.7 if you want a single lens that covers 20-50mm equivalent with a constant f/1.7. Great for video, indoor events, and landscape work where you can't change lenses.

  • Prefer compact size and classic field of view?: Choose the Olympus 17mm F1.8 II if you value portability and a 34mm equivalent prime for street, travel, or everyday shooting. It's lighter, cheaper, and still fast.

  • Prioritize versatility over maximum speed?: If you shoot mostly in good light and want a wide zoom without paying for f/1.7, consider other MFT zooms like the Olympus 7-14mm f/2.8 or Panasonic 7-14mm f/4. They offer a wider field of view at a lower price point. Check the Olympus ED 150-600mm F5.0-6.3 IS or Olympus ED 300mm f/4 IS PRO if you need telephoto reach instead of wide angle.

    Olympus ED 150-600mm F5.0-6.3 IS

    Olympus ED 150-600mm F5.0-6.3 IS

    Olympus ED 300mm f/4 IS PRO

    Olympus ED 300mm f/4 IS PRO

Product facts

  • Panasonic 10-25mm f1.7 Leica DG ASPH. Lens: In stock – 1 Year Warranty, FREE UK Delivery. Catalog price $1053.38 (was $1699.00). The Panasonic 10-25mm f1.7 gives you a constant fast aperture across an ultra-wide zoom range, ideal for low-light landscapes and video.
  • Olympus 17mm F1.8 II ED Lens: In stock – 1 Year Warranty, FREE UK Delivery. Catalog price $316.14 (was $479.00). The Olympus 17mm F1.8 II is a compact, fast prime that's easy to carry daily and delivers a natural perspective for street and travel.

Which lens fits you?

Best for

  • Travelers and street photographers who want a compact, fast prime
  • Video creators and event shooters who need a wide zoom with constant aperture

Not for

  • Budget-focused buyers who need the widest possible field of view at the lowest cost
  • Wildlife or sports shooters who require long telephoto reach