Rapid Box Switch Octa-L vs Octa-M: Which Size Fits?
By Westcott | Published: 2026-10-29
Category: Comparisons
Compare the Westcott Rapid Box Switch Octa-L (48") and Octa-M (36") collapsible softboxes. Find out which size suits your portrait, product, or on-location work.
Quick answer
Choose the Octa-L (48") for broader, softer light on groups or full-length portraits; pick the Octa-M (36") for a more portable kit that still delivers a classic octagonal catchlight on headshots and three-quarter frames.
Why size matters for light quality and portability
A larger modifier spreads light over a wider area and produces softer shadows because the light source is bigger relative to the subject. The Octa-L’s 48-inch diameter gives you that expansive, wrap-around quality, while the Octa-M’s 36-inch face is still generous but keeps the kit lighter and easier to pack.
Both use the same Rapid Box Switch framework, so you can swap light sources in seconds with a compatible Switch Insert. The trade-off is purely physical: the larger panel needs more bag space and a stouter stand, whereas the smaller one fits tighter travel kits.
Octa-L vs Octa-M: trade-offs at a glance
- Light spread and softness: Octa-L (48") gives a broader, softer light that works well for groups, full-length portraits, and product shots where you want gentle falloff. Octa-M (36") still delivers a soft, flattering light but with slightly more contrast and a tighter beam, which can help separate a single subject from the background.
- Portability and setup: Both collapse quickly thanks to the Rapid Box Switch design, but the Octa-M’s smaller folded size fits more easily into a carry-on or small gear bag. The Octa-L requires a larger case and a sturdier light stand to support its wider frame. If you fly frequently or shoot in tight spaces, the Octa-M saves noticeable room and weight.
- Compatibility and future-proofing: Both accept the same Switch Inserts, so you can use the same speedlight, strobe, or LED adapter on either modifier. The Octa-L includes a Round Head Speedlight Insert in the box; the Octa-M requires a separate Switch Insert purchase for most light sources. Factor in the cost of an extra Insert if you choose the Octa-M and don’t already own one.
Product facts at a glance
- Rapid Box Switch Octa-L with Round Head Speedlight Insert: 48" nominal diameter with taut silver interior and neutral diffusion fabric. The larger surface area produces a softer, more even light that wraps around subjects, ideal for group portraits or full-body fashion shots.
Rapid Box Switch Octa-L with Round Head Speedlight Insert - Rapid Box Switch Octa-M: 36" nominal diameter with the same collapsible framework and fabric quality. The smaller size is noticeably lighter and packs smaller, making it a practical choice for location photographers who need a reliable octa without the bulk.
Rapid Box Switch Octa-M
Which one fits your work?
Best for
- Studio or location photographers who need the softest possible light for groups or full-length portraits and have the space to carry a 48-inch modifier.
- Shooters who want a ready-to-go kit with the included Round Head Speedlight Insert.
Not ideal for
- Photographers who prioritize a compact travel kit and shoot mostly headshots or three-quarter portraits where a 36-inch octa already provides plenty of softness.
- Budget-conscious buyers who don’t want to purchase an additional Switch Insert separately.
