Modern Classic SLRs Series :
Olympus T45 Flash

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If I can remember correctly, the T45 was the fourth TTL flash and the first bracket flash to offer that revolutionary feature which practically has leapfrogged flash technology to such a new level operational ease and functionality. Although in an indirect way, Olympus has offered such an option in a bracket flash design with the Quick AUTO 310/ounce Grip 1 or T32/T20 Bounce Grip 2.

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However, somehow even the T32/Grip 2's moderately high power output and fast recycling time may still not be good enough and fall short of certain professional applications especially in news, reportage or like fashion or stage photography etc. That raised a demand for a more powerful flash unit which a conventional portable flash design may not able to fulfill such technical requirement. Olympus answered those desire with a very powerful T45 bracket flash or more popularly referred as Hammer Head design flash. For TTL auto flash operation: The T45 is used with an OM4, OM4Ti, OM3Ti, OM40 or an OM-2SP by means of a TTL Auto Cord T2 (0.1m), which fits in a socket on the camera grip. If the camera is motorized with either a Motor Drive or Power Winder, the connection is made via TTL Auto Cord T2 (0.15m). It can also be connected to the OM1(n) or OM2n with a 0.3m TTL Auto Cord T, provided the camera has the Accessory Shoe Type 4 attached.

Most would associate the T45 as any other commercial bracket flash unit. But Olympus has, carried and instilled the same philosophy of practicality and functionality that makes the OM cameras unique to the development of one of the most remarkable flash system of any SLR during its time. The flash as with other OM modular flash units, can be combined in endless variety for precisely the effects you desire.

TTL panel.jpg

Normal AUTO.jpg

Calculator Feet.jpg

For TTL AUTO flash mode, the flash head back panel reverses.

You can also select the calculator panel calibrated in "feet" instead of metric scales.

For Normal AUTO Flash: A choice of F4, f5.6 and f8. For Manual Flash: you can use GN45, 32, 22 11 and 8 Guide number ASA100, meter.

The T45 is a very powerful flash with a Guide Number of 45, (ISO/ASA 100, meters), which in many ways, when it combines with all those amazing OM original flash technologies, in particular, the TTL OTF auto flash metering, has put professional flash photography on a completely new level. The T45's guide number of 45 still positioned the OM flash among rare few respectable commercial flash units even if some of the current bracket flash by third party suppliers such as Metz or Sunpak has started to offer even higher output of 55 or 60. But over all performance with any OM bodies that offer OTF flash exposure control, the T45 still looks as a better option with better integration and performance of relating technologies and reliability.

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Electronic Flash T45

The Electronic Flash T45 looks about the same size as other professional flash units with similar rated output. The actual size of T45 could be far smaller than comparable units because it is the only flash in its class to do away with bulky, heavy shoulder packs. Olympus has designed to enable batteries to be fitted inside the grip of the flash itself without affecting its overall performance. The T45 can deliver some 100 full flashes per charge of its T45 Ni-Cd Pack - almost twice the number of comparing professional flash units. It also features a very fast recycling time of just 0.2 - 2.2 seconds - also twice as fast as other units and critical for demanding fast flash recycling works such as news coverage or stage and fashion photography. If you multiply weight reduction by recycling speed by number of flashes, and the T45 comes out way ahead of the competition.

Normal Auto range (ISO/ASA100). F4, F5.6, F8. Manual range GN 45, 32, 22, 16, 11, 8. (ISO/ASA 100 in meters). GN 146,104, 72, 52, 36, 26. (ISO/ASA100 in feet).

But the true potential of the OM T45 electronic flash can be realized when you combine it with any of the TTL Auto Flash capable OM SLR bodies such as OM-4 or OM-2 series models. Due to its exceptional powerful flash output, the T45 can be used virtually at any aperture available on the taking lens. The real OM advantage here is apparent - TTL Auto also means there's absolutely no need for flash settings - everything is controlled by the camera's centralized computer system.

NiCd Charger.jpg
Other than its size, the T45 is quite versatile, as many as nine linked flash units can be used in unison, and automatic exposure should provide more than just satisfactory result. The exposure measurement in this case id far more superior than conventional auto flash as it covers the same area as the composition, because it's taken through the lens. Further, this Olympus made flash can also be used with any camera with a synchro socket, making it a hard proposition for any pro to resist other general purpose flash units. <<<<---- The T45 NiCd Charger 1. Recharge from house hold current, 8 hours recharging time.

Other than TTL flash mode, it provides Normal AUTO and Manual flash. In such case, you can even used the flash for non-OM camera with a synchro socket while minus the TTL flash function.

For normal AUTO flash operations, you have a choice of three apertures - f/4, f/5.6 and f/8 at ISO 100/21' connection is via a standard sync cord. If the flash is to be used manually, the flash range can extend from f/45 to f/8. The flash angle coverage is slightly disappointing if you want to pick on something out of the T45, i.e. the standard flash module covers only with a 28mm wide-angle lens, the flash head can also be tilted to give bounce flash. To use the flash with a older OM-1n and OM-2n with an Accessory Shoe Type 4, you would need a 0.3m TTL Auto Cord T.

The T45 can also be connected to a OM-4 series bodies or a newer OM-2SP by means of a TTL Auto Cord T2 (0.1m) which connects to the TTL socket on the camera while for those bodies fit with either a motor drive or power winder, the proper connecting cable should be a TTL Auto Cord T2 (0.15m).

The T45 uses a rechargeable battery pack with charger is supplied with the flash unit and provides the necessary power for the T45. For studio use the T45 can also be connected directly to the mains using the AC Adapter 2. With all those OM bodies that supports TTL flash ready light, the flash will activate the camera viewfinder display for both ready light and correct flash exposure.


Type: Energy-saving, series-circuit type TTL Centralized Control (TTL AUTO), system flash unit (with NORMAL AUTO and MANUAL capacity).
Guide number
: 45 (ISO 100, meters) or 146 (ISO 100, feet)
Coverage angle: 53
° vertical, 74° horizontal.
Flash duration
: 1/40,000 - 1/1,000 sec.
Recycling time: 0.2 - 2.2 sec. with T45 Ni-Cd Pack 1 on TTL AUTO and NORMAL AUTO. (varies depending on flash -to- subject distance).
Color temperature: 5,800
° K
Exposure calculator
: Reversible plate type reverses for NORMAL; AUTO/MANUAL flash.
Aperture setting: Continuous, couples with aperture ring setting of camera lens.
TTL Auto: OM2 & OM4 series, OM40 and OM77AF.
SBC Sensor Acceptance Angle: Matches view of camera lens.
TTL AUTO check: Neon-flicker indication. Viewfinder indication contact provided.
Ready light check: Charge lamp and viewfinder indication contact.
Working range
for guidance only (ISO 100):
F/1.2: 4.7-37.5m (15.7-125.0 ft.)
F/1.4: 3.9-32.1rn (13.0-107.0 ft.)
F/2.0: 2.8-22.5m 9.3- 75.0 ft.)
F/2.8: 2.0-16.0m 6.7- 53.3 ft.)
F/4.0: 1.4 -1 1 3M (4.7-37.7 ft.)
F/5.6: 1.0 - 8.0m (3.3-26.7 ft.)
F/8.0: 0.7 - 5.6m (2.3-18.7 ft.)
F/16: 0.35 - 3.0m (1.2-10.0 ft.)

Aperture setting: 3 apertures (F4, F5.6 and F8 at ISO 100).
Normal auto sensor acceptance angle: Approx. 20°
Working range: 1.4 - 11.3m (4.7 ft. - 37.7 ft.) at F4; 1 - 8m (3.3 ft. - 26.7 ft.) at F5.6; 0.7 - 5.6m (2.3 ft. -18.7 ft.) at F8 (ISO 100).
AUTO check: Neon-flicker indication. Viewfinder indication contact
Ready light check: Charge lamp and viewfinder indication contact.

< Manual >
Guide number: 45, 32, 22,16,11, 8 (ISO 100 m)
Test button for NORMAL AUTO check & MANUAL flash: Push-button type.
TTL auto cord socket: Plug-in type.
External power socket: Plug-in type.
Bounce angle range: 90° vertical, 340° horizontal.
Power source: T45 Ni-Cd Pack VAC house current via Electronic Flash AC Adapter 2, 3.
Dimensions and Weight: 305 X 87 X 116mm, 1120g. (less batteries)
(12.0 X 3.4 X 4.6 in., 39.5 oz.)

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Shared Resources: Supplementary Articles:
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Motor Drive and Power Winder: Main Index Page (4 Parts)
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Credit: My old time buddy, Ahmad Ikram, Dr of Rubber Research Institute (RRI), Malaysia who shares the same passion with me and also lending his OM-1n, OM-4 and the Motor Drive 1 to me for preparing some images in this site; Mark Dapoz <>for reminding some broken links; Mr Poon of Foto Poon, Ipoh, Mr Richard, Ampang Park, Mr Lim and Miss Jenny of Foto Edar for their generosity for their OM1(n), OM2n camera and some Zuiko lenses. Mr Hans van Veluwen for mistakenly using some content earlier from his OM website; J Sorensen for providing some useful images to rectify some technical "flaws"; Mr Gen Holst for helping during the early stages of development of this OM site; Mr KKLow for some of his earlier images on the OM-1appeared in this website; Miss Wati and Mirza for helping me to convert this Operation Manual into a HTML format. Mr MCLau for rectifying some mistakes made on the earlier preview sites. Site created 'unfortunately' again with a PowerMac. A personal tribute to the creator of the OM system and also a site dedicated to all the fans of Olympuses and Zuiko Optics worldwide. Some of the content and images appeared in this site were scanned from OM official marketing leaflets, brochures and instruction manual(s) for educational purposes. Olympus is a registered tradename of Olympus Optical Inc., Japan.