The Front Desk Review

Paul C. Buff · Updated October 2026

Paul C. Buff Einstein E640 Flash Unit: price & specs

Paul C. Buff Einstein E640 Flash Unit. Every price and spec below is linked to its source and dated — no guesses.

Source: paulcbuff.com verified ✓ corroborated verify in ledger

PlatinumDeskmark98/100#1 of 12 in class

The Paul C. Buff Einstein E640 Flash Unit is listed at $529.95 on paulcbuff.com as of 2026-08-31, #3 cheapest of 8 studio strobes (median $749); other retailers may be lower. It earns a Platinum Deskmark — 98/100 pay-blind standing, #1 of 12 in class.

Verified Oct 8, 2026 · figures linked to their source in the table below

Cheapest studio strobes: Godox SK400II 400Ws Studio Flash Monolight — $329.77

Seen at

Each figure is what that seller's own page published on the day we read it — not our price of record, and not a live quote. Follow the link for what it costs right now.

See Paul C. Buff Einstein E640 Flash Unit on Amazon Live price at the store — may differ from the dated listed price above. As an Amazon Associate we earn from qualifying purchases.
Paul C. Buff Einstein E640 Flash Unit — Paul C. Buff
Image: www.manualslib.com (© Paul C. Buff)

Is the Paul C. Buff Einstein E640 Flash Unit a good buy?

At $530, the Paul C. Buff Einstein E640 Flash Unit is #3 cheapest of the 8 studio strobes we track, where the median is $749. On the spec sheet, its power output of 640 Ws is the highest of the 12.

Specifications

Price (US)$529.95 Manufacturer's own direct price. Paul C. Buff sells direct-to-consumer; the unit is listed as Einstein Flash Unit on its store.
BrandPaul C. Buff
Released—
Power output (Ws)640
Flash duration (t0.1)1/568 sec at full power (Constant Color mode, t0.5 1/1600 sec); as fast as ~1/2000 sec (t0.1) at half power in Action Mode
Recycle time (s)0-1.7
Ttl hss supportManual only — no TTL, no camera-side HSS. Fires via CyberSync radio triggers or optical slave; Action Mode shortens flash duration for motion-freezing rather than providing sync-pulse HSS.
Modeling lamp (W)—
Color temperature (K)5600
Power sourceAC only (100-240V, 3-wire grounded, auto-sensing with IEC connector); no battery option

Source: paulcbuff.com (read 2026-10-08) · corroborated by manualslib.com (read 2026-08-09).

How we checked

Paul C. Buff's legacy Einstein E640 spec page (http://s196259524.onlinehome.us/e640.php, read 2026-08-09 — the manufacturer's own content on its former host, and still the only page publishing these figures) confirms the 9 f-stop power range (640Ws full to 2.5Ws at 1/256, adjustable in 1/10-stop increments) and 1.7-second full-power recycle time that scales down proportionally at lower power. The Einstein's own hosted user manual (via ManualsLib) confirms color temperature is held to 5600K ±50K in Constant Color mode across the entire power range (rising to ~5750K at half power in Action Mode), full-power t.5 flash duration of 1/1600 sec and t.1 of 1/568 sec, ~1/2000 sec t.1 at half power in Action Mode, and AC-only 3-wire grounded power with no battery option. No fetched source publishes a modeling-lamp wattage rating (the manual describes adjustable Proportional/Manual/Off modeling-light modes without a watt figure), so modeling lamp (W) is left blank rather than guessed. Price $529.95 read from Paul C. Buff's own store on 2026-09-10; the legacy spec page still shows the superseded $499.95, which is why the price is cited to the store and not to it.

Is the Paul C. Buff Einstein E640 Flash Unit worth it vs cheaper studio strobes?

Paul C. Buff Einstein E640 Flash Unit against its closest cheaper and pricier studio strobes on the specs that matter — every value sourced. See all 8 ranked

ProductPricePower output (Ws)Flash duration (t0.1)Recycle time (s)Ttl hss supportColor temperature (K)
Paul C. Buff Einstein E640 Flash Unit this$529.956401/568 sec at full power (Constant Color mode, t0.5 1/1600 sec); as fast as ~1/2000 sec (t0.1) at half power in Action Mode0-1.7Manual only — no TTL, no camera-side HSS. Fires via CyberSync radio triggers or optical slave; Action Mode shortens flash duration for motion-freezing rather than providing sync-pulse HSS.5600
Westcott FJ400 Strobe 400Ws with AC/DC Battery$349.45400Normal mode 1/280-1/3000 sec; Freeze mode 1/280-1/7000 sec0.05-0.9TTL; HSS to 1/8000s; Rear Curtain Sync5500
Godox AD400Pro 400Ws TTL Outdoor Flash$5994001/240 to 1/12820 sec0.01-0.9TTL (Canon, Nikon, Sony, Fujifilm, Olympus); HSS to 1/8000s4800

Frequently asked questions

How much does the Paul C. Buff Einstein E640 Flash Unit cost?

The Paul C. Buff Einstein E640 Flash Unit has a US price of $529.95 (Manufacturer's own direct price. Paul C. Buff sells direct-to-consumer; the unit is listed as Einstein Flash Unit on its store.), as of 2026-10-08.

How does the Paul C. Buff Einstein E640 Flash Unit compare on price?

At $530, the Paul C. Buff Einstein E640 Flash Unit is #3 cheapest of the 8 studio strobes we track, where the median is $749.

What are the Paul C. Buff Einstein E640 Flash Unit's key specs?

Paul C. Buff Einstein E640 Flash Unit (Paul C. Buff): Power output (Ws) 640, Flash duration (t0.1) 1/568 sec at full power (Constant Color mode, t0.5 1/1600 sec); as fast as ~1/2000 sec (t0.1) at half power in Action Mode, Recycle time (s) 0-1.7, Ttl hss support Manual only — no TTL, no camera-side HSS. Fires via CyberSync radio triggers or optical slave; Action Mode shortens flash duration for motion-freezing rather than providing sync-pulse HSS., Color temperature (K) 5600. Full sourced spec sheet verified 2026-10-08.

Price of record: $529.95 at paulcbuff.com, 2026-08-31. Other retailers may be lower — check the current price:

See Paul C. Buff Einstein E640 Flash Unit on Amazon As an Amazon Associate we earn from qualifying purchases.

Similar studio strobes

Nearest in price — swipe to browse. Every pick sourced and dated.

All studio strobes ranked · Open data & methodology · Queryable via MCP

Compare with

Head-to-head

Cheaper studio strobes

Step up

Related categories