Canon Speedlite 420EX

Name: Canon Speedlite 420EX
Brand: Canon

At a guide number of 42 meters, this compact flash packs a punch that still surprises in the right hands

Overview

The Canon Speedlite 420EX isn't the flash that changed the game, and it wasn't meant to. Canon positioned it as a mid-tier option during the shift from film to early digital SLRs. It was built for photographers who needed reliable E-TTL compatibility without the bulk or price of Canon's flagship units. It's designed for the Canon EOS system and mounts to the hot shoe of EOS film and early digital SLR cameras. The EF mount's electrical communication handles exposure. It lacks the high-output power of its bigger siblings, but owners report consistent performance for general-purpose use, especially where portability matters more than raw power.

The head tilts and swivels, so basic bounce lighting works. That's not always a given at this level. It also supports wireless slave use, so another flash in Canon's optical system can trigger it off-camera. That gives you a modest way to expand a lighting setup without radio triggers or third-party systems. According to available documentation, it runs on standard AA batteries, which makes it easy to power in the field. Recycling times and shot count per set aren't documented in the available sources. The zoom head adjusts automatically based on lens focal length, but collectors note the range is fairly limited compared to higher-end models. That may restrict it with ultra-wide or extreme telephoto lenses.

Despite its age, sources suggest the 420EX is still capable in controlled scenarios. One photographer described it as "ancient," yet still useful, particularly as a secondary unit or slave flash in multi-light setups. It's not fast or feature-laden by modern standards, and it was never meant to be.

Specifications

Manufacturer	Canon
Product Type	Speedlite flash
Target Cameras	Designed for Canon EOS film and early digital SLR cameras
Lens mount	Canon EF mount
Guide Number	42 meters (ISO 100 at 105mm)
Zoom range	Relatively limited zoom range
Power source	Uses AA batteries
Features	Compatible with E-TTL
Features	Has wireless "slave" capability
Head movement	Head tilts and swivels

Collectibility & Value

Current market prices vary a lot by region and condition. One European retailer lists it at a sale price of €30.98, while another vendor in the U.S. offers it for $79.00. Common failures include units that won't power on or act "totally dead," according to user reports on technical forums. A recurring hardware issue is a pushed-down pin in the foot connection. It can disrupt communication with the camera and mimic more serious internal faults. When evaluating used units, the recommended check is simple: verify that the flash fires consistently, the head tilts and swivels smoothly, and all mechanical locks engage properly. No original MSRP or production years are documented in available sources. Its position in the lineup appears to have been below the 580EX series, as a practical step up from entry-level units.