Best Flash for OM SYSTEM PEN
The OM SYSTEM PEN ships with a hot shoe cover and no flash. Its X-sync is 1/250 second, and the body weighs 393 g with a battery and card. The September 9, 2026 compatibility table marks the radio flash with a maximum guide number of 42 as compatible. That flash is the FL-700WR Electronic Flash. Check FL-700WR Electronic Flash on Amazon.
Our Top Picks at a Glance
Reviewed October 2026 · Hot shoe · X-sync 1/250 · No flash in the box · PEN row on the Sep. 9, 2026 table
Guide number 42, radio commander and receiver, dust, splash, and freeze sealing to −10°C. OM SYSTEM lists $439.99, and that US page was out of stock.
Check Price at Amazon Read full review ↓Maximum guide number 58, also sealed to −10°C, and the US store offer is $440.99 in stock. That is $1.00 above the FL-700WR list price, on clearance.
Check Price at Amazon Read full review ↓Guide number 36 at 105mm, 200 g without batteries. Godox’s US page lists $76 and in stock. It is not on OM’s compatibility table.
Check Price at Amazon Read full review ↓This page contains affiliate links. A purchase through those links may earn Cameraegg a commission at no extra cost to you.
| Flash | On this PEN | Output and price | Buy |
|---|---|---|---|
| FL-700WR Electronic Flash | Compatible. Radio commander and receiver | GN 42, $439.99, US store out of stock | Check price |
| Olympus FL-900R Electronic Flash | Compatible. Clearance, in stock at OM SYSTEM | GN 58 max, offer $440.99 | Check price |
| Godox TT350O | Not on the OM table. Godox 2.4 GHz radio | GN 36 at 105mm, $76 | Check price |
| FL-LM3 | Marked incompatible for the PEN row | Clip-on flash for other bodies | Check price |
How We Picked
Three sourced facts: the PEN’s shoe and sync line, the September 9, 2026 compatibility row, and which of those flashes the US store still prices.
- The body has a shoe and a 1/250 sync. OM SYSTEM’s PEN specifications: hot shoe equipped, X-sync 1/250 second, and with the electronic shutter 1/50 second up to ISO 6400, or 1/20 second at ISO 8000 and above or when ISO bracketing. Flash intensity is ±3 EV in 1/3, 1/2, or 1 EV steps. Wireless flash control is listed as available. The box list is the body, a cap, a hot shoe cover, a strap, a manual, and a battery. Body weight is 393 g with battery and card. Weather sealing is IPX1 when the body is used with an OM SYSTEM splashproof lens. Live ND says flash is unavailable.
- The PEN row is a clean X for two current shoe flashes. OM Digital Solutions compatibility table, modified September 9, 2026: the row named PEN marks FL-700WR and FL-900R compatible, with no footnote. FL-LM3 is marked incompatible. The same table’s footnotes for other cameras restrict MULTI mode or wireless TTL. Those footnotes are not on the PEN row.
- Price and stock decide the order under that table. The FL-700WR US offer is $439.99 and schema availability is out of stock. Maximum guide number 42, about 303 g for the body, coverage 24–150 mm in 35mm terms, radio to 30 m, dust, splash, and freezeproof to −10°C. The FL-900R product-page offer is $440.99 and in stock, in the clearance category, with a maximum guide number of 58. The Godox TT350O US page lists $76 and in stock. Its manual prints guide number 36 at ISO 100 and 105 mm. It does not appear on the OM table.
Detailed Reviews
FL-700WR Electronic Flash View on Amazon View on B&H
| OM SYSTEM US price | $439.99, listed out of stock |
|---|---|
| Guide number | 42 maximum |
| Coverage | 24–150 mm, 35mm equivalent |
| Wireless | Radio, up to 30 m, commander and receiver, up to 3 groups |
| Sealing | Dust, splash, freezeproof to −10°C |
| Weight | About 303 g, body only |
| Also on the flash | TTL, first and second curtain, LED for video, Super FP on the flash page |
Why it fits the OM SYSTEM PEN. The compatibility row is an X with no footnote, so this is the radio flash OM still lists for the new PEN. Guide number 42 and a 303 g body sit on a camera that weighs 393 g with a battery and card. Coverage runs to 150 mm in 35mm terms, which is the long end of a Micro Four Thirds zoom. Radio works as commander or receiver out to 30 m, in up to three groups. Dust, splash, and freeze sealing to −10°C is the match for a body rated IPX1 with a splashproof lens. The US offer is $439.99. Schema availability on that page is out of stock.
The flash page also lists Super FP, including a 1/8000 second line in the short feature list. The PEN specifications page does not. It prints X-sync at 1/250 second, and a slower ceiling on the electronic shutter. Buy this flash for TTL, bounce, and radio on the shoe. The FL-900R is the in-stock unit with guide number 58. The box includes the flash, a stand, a soft case, a wireless flash adapter, and a manual.
Check Price on Amazon US, UK, CA, DE → Check Price on B&H
Olympus FL-900R Electronic Flash View on Amazon View on B&H
| Product-page offer | $440.99, in stock |
|---|---|
| Crossed price on that page | $629.99 |
| Guide number | 58 maximum |
| Sealing | Dust, splash, freezeproof to −10°C |
| Store category | Clearance |
| On the PEN table | Compatible, no footnote |
Why it fits the OM SYSTEM PEN. The same September 9, 2026 row marks the FL-900R compatible, again with no footnote. OM’s product page calls it a high-power flash with a maximum guide number of 58, dustproof, splashproof, and freezeproof to −10°C, with a commander function and support for Multi mode, High Res Shot, Focus Stacking, and Focus Bracketing. The PEN’s own creative modes include High Res Shot and Focus Stacking. The product-page offer is $440.99 and the schema says in stock. That is $1.00 above the FL-700WR’s $439.99 list price. The page also shows $629.99. A clearance index on the same store listed $503.99. Those two sale figures stay separate. The offer used here is the product page’s $440.99.
This is the unit the US store will sell now. It is filed under clearance, so it is the remaining stock of the higher-output flash, not a new compact model. The page describes a commander for wireless flash units and does not print the FL-700WR’s radio distance or built-in receiver. Use the FL-700WR when the radio set is the point. Use this one when guide number 58 and a live add-to-cart are the point.
Check Price on Amazon US, UK, CA, DE → Check Price on B&H
Godox TT350O View on Amazon View on B&H
| Godox US price | $76, in stock |
|---|---|
| Guide number | 36 m at ISO 100, at 105 mm |
| Coverage | 24–105 mm, auto or manual zoom |
| Head | 0–270° horizontal, −7° to 90° vertical |
| Power | 2 AA. About 210 full-power flashes on 2500 mAh Ni-MH |
| Size and weight | 140 × 62 × 38 mm, 200 g without batteries |
| Radio | Godox 2.4 GHz, master or slave, about 30 m, 3 groups |
Why it fits the OM SYSTEM PEN. The manual prints guide number 36 at ISO 100 and 105 mm, on a head that weighs 200 g without batteries. That is the small flash for a 393 g body. Godox’s US page lists $76 and in stock, which is $363.99 under the FL-700WR’s $439.99 and $364.99 under the FL-900R offer. Recycle time is about 0.1–2.2 seconds on the Ni-MH cells in the manual. The head swings 0–270° and tilts from −7° to 90°. Two AA cells power it.
The manual says the TT350O is for Olympus and Panasonic TTL, with its own 2.4 GHz master and slave. OM’s September 9, 2026 table does not list it, so PEN functions that the FL-700WR page names, including High Res Shot and Focus Stacking support, are not claimed here. The manual also lists high-speed sync up to 1/8000 second. The PEN page does not print that sync. Treat 1/250 second as the camera’s X-sync. The manual does not list a weather rating. For rain and radio that OM documents on this body, use the FL-700WR.
Check Price on Amazon US, UK, CA, DE → Check Price on B&H
If You Need Something Else
The FL-LM3 is the small clip-on flash that the same table marks compatible with the PEN-F. On the row named PEN, it is a dash. A hot-shoe accessory already on the camera also blocks flash use, which the table states above the footnotes. This PEN’s shoe wants a full flash, not that clip-on.
Live ND, at ND2 through ND16, says flash is unavailable, with ISO held to 800. Focus Stacking and High Res Shot are on the PEN. The FL-700WR and FL-900R pages both say those camera functions are supported. The electronic shutter’s flash ceiling is 1/50 second up to ISO 6400, and 1/20 second from ISO 8000 or when ISO bracketing is on.
Frequently Asked Questions
What sync speed the PEN prints
X-sync is 1/250 second. With the electronic shutter, flash sync is 1/50 second up to ISO 6400, and 1/20 second at ISO 8000 and above or when ISO bracketing is used. Compensation is ±3 EV in 1/3, 1/2, or 1 EV steps.
Whether the flash page’s 1/8000 second line is the camera’s sync
The FL-700WR page lists Super FP and a 1/8000 second feature line. The Godox manual lists high-speed sync up to 1/8000 second. The PEN specifications page prints 1/250 second as X-sync and does not add a Super FP line.
What happens to flash in Live ND
Live ND is ND2, ND4, ND8, or ND16, in S or M only. The specifications say flash is unavailable, ISO goes up to 800, and the fastest shutter at ND2 is 1/30 second, slower as the ND step rises.
Why the FL-LM3 is not the small-flash pick
The September 9, 2026 table marks FL-LM3 incompatible on the PEN row. It remains marked compatible with the PEN-F. This body’s box includes a hot shoe cover, and the shoe is the mount for the three flashes above.
What the two OM store prices mean
The FL-700WR offer is $439.99 and the page is out of stock. The FL-900R product-page offer is $440.99 and in stock, with $629.99 also shown on that page. A clearance index listed the FL-900R at $503.99. The $440.99 figure is the product-page offer.
Final Verdict
The OM SYSTEM PEN has a hot shoe, no flash in the box, and X-sync at 1/250 second. The FL-700WR Electronic Flash is the compatible radio flash, with guide number 42, sealing to −10°C, and a $439.99 US list price that was out of stock. The Olympus FL-900R Electronic Flash is compatible too, with a maximum guide number of 58, and the product-page offer is $440.99 in stock on clearance. The Godox TT350O is guide number 36 at 105 mm and $76, and it is not on OM’s September 9, 2026 table.