Modern Classic SLRs Series :
Olympus OM2(n) SLR camera - Other Issues Part V

 

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To handle all these enormous amount of data in the most responsive manner, Olympus had designed the their very first microcomputer that used for commercial electronic application.

om2elecsml.jpg

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The center nerve system of the entire OM2 camera was handled by the use of premium electronic components which includes MSI and MOS-FET * units. etc. this enables the camera has processing power in microseconds (1/1,000,000 sec.) and achieve high durability while maintain its compactness. Hermetic sealing against dust and moisture and has an exceptional leakage-resistant characteristic and also specially treated with high purity alumina plate mounting to enhance its reliability. * MOS: Metal Oxide Semiconductor; MSI: Medium Scale Integrated Circuit

fre.jpg   board.jpg
Further, special high conductivity alloys of gold, silver, platinum and other selective metal with respective metal quality are use for its main circuit and trigger switch which initiates shutter release action while a sub-circuit stand-in to extends its reliability. By doing away with conventional memery circuit, the CPU gains extra processing power while reducing power consumption and sensitivity to changes in temperature and humidity.

The capacity of the OM2(n) electronic circuits is the key to its Centralized Control System that commands all its automatic camera operations. Originally, when the OM2 was introduced, Olympus has only a sole flash model that provide TTL function, it was called "Quick Auto 310" which required an separate Accessory Shoe Type 2 to enable TTL Flash operation. Other than the TTL capable Quick Auto 310, models such as Quick Auto 300 and PS Quick 200 etc. offered normal and plain manual flash control feature which also can be used with restricted function.

barecurtain.jpg
The Quick Auto 310 has quite a few dedicated accessories on its own which most of them are NOT compatible with newer T-series flash models which you have to take notice when you are trying to source them on the used market. NOTE: The random pattern shutter curtain of earlier OM2 has a narrower strip with denser dots in the middle of the curtain across from left to right. The OM2n has a very well distributed pattern across the whole picture area. (see illustration at above). This are simulated pattern generates from computation of thousands of virtual of actual picture taking situations.

For an instance, the Power Bounce Grip 1 is designed for older Quick Auto 300 and 310 flash units, while the Power Bounce Grip 2 is designed for newer T-series flash units. T-series flashes don't work on the Grip 1, and the QA flashes don't work on the Grip 2.

TTL "OTF" Auto - Viewfinder Indicator Flash Terminals These terminals link any OM System flash unit attached via the Accessory Shoe 4 (For OM2n, Shoe 3 for older OM2, Shoe 1 for OM2 with Quick Auto 310 ) or TTL Auto Connector Type 4 (For OM2n) directly to the OM-2's electronic circuits. At "AUTO" mode or "OFF" the flash functions on TTL "OTF" Auto.

AUTO310.jpg
The flash emission is controlled by the camera (Hence referred as "camera regulated" flash) according to the amount of light passing through the lens and hitting the film plane during the exposure. Full flash charge is shown in the viewfinder (For OM2n models only) via a lighted LED (viewfinder ready light) and correct flash exposure is confirmed by the same LED flickering afterwards. Flash units attached via the hot shoe automatically set the camera synchronization to "X" (auto sync). At Auto shutter speeds above 1/60 sec. the flash will not fire and the exposure will be made with available light. This is one of the main differences in function between newer OM2n and older OM2 models.

As discussed earlier on the OM1 site, the highly unusual feature found in early OM bodies is at the top of pentaprism. There is a accessory socket where it accepts different types of clip on accessory shoe to use with various "types" of flash - Basically, the main problem is when the Olympus OM2 was released to the market, the TTL OTF auto flash Quick AUTO 310 was NOT ready to suuplement the OM2 "new" TTL flash capability yet and in its instruction manual in 1975 is still offering the non-TTL Quick AUTO 300 electronic flash and mentioned ".... a new flash unit is under intense development to take advantage of the new flash mode avail;able in the new OM2 ...." . Olympus can claimed it as an "cableless contact" feature but it is just an accessory that can be screwed into the tiny opened socket. Frankly, I find there is no apparent reasons of why OM SLRs designed with a removable accessory shoe and I think Olympus find it hardly convincing as well and eventually since OM-10, all OM bodies was incorporate a fixed accessory shoe. The OM2SP introduced very late (In fact, it was made available only AFTER the 1983/84's OM4) remains as the only OM2 models that has a fixed accessory shoe on top of the pentaprism hosing.

Shoe Frontview.jpg
A more confusing part for any new OM user is the few versions of accessory shoe issues which you need to take note: Shoe 3 came on OM-2's sold after the T-20 flash was introduced, and is available as an accessory for older OM-2's to allow them to fully utilize a T-series flash.It allows manual, normal auto, and camera regulated (TTL) flash. What happens to the pictures below ? You must have thought it is an powerful handle flash such as T45 or something equivalent. No. Olympus has quite an idea on their own - they designed their flash system with a modular concept.


Relative: Olympus Flash Group (4 Parts) Quick Reference Guide: Olympus T45, T32, T20, F280, S20, T10 Ring, T8 Ring, T28 Macro Single, T28 Macro Twin, TTL Quick AUTO 310, NON-TTL Quick AUTO 300, PS200, PS200 Quick and T Power Control Version 1

shoefixshw.jpg
Nevertheless, you still have to understand nature of how it works in its compatibility between camera Models/Shoes. i.e. Older M-1 and OM-1's can only accept a Shoe Type 1.OM1(n) and OM2n should use a shoe Type 4; original OM-2 model came with Shoe Type 2 which was designed specifically with Olympus first ever TTL flash, Quick Auto 310. But you can make use of shoe Type 3 in combination with newer TTL flash T20 and T32.

OFF TOPIC SUPPLEMENT: Accessory Shoe Type 1 or early "Fix" Type shoe for M1 and OM-1's has no viewfinder ready light feature since they isn't any additional terminal apart from the main X-contact (F). Shown at left is a Accessory Shoe Type 2 designed for early OM-2 bodies for TTL flash with Quick Auto 310 flash, it has an additional contact at the hotshoe.

<<< -- An early OM2 with a Shoe 2. Credit: Miss Jennie/Mr Lim of Foto Edar, Kuala Lumpur.

The extra contact require an additional pin which make it not usable with any M1 or OM-1 bodies which has only a single input socket (B) while early OM-2 bodies has two sockets (A). The OM1n model enjoys additional benefits with the new designs when used with Accessory Shoe Type 4 and OM2n bodies in particular, has full blown TTL flash capabilities when used in conjunction with T series flash. These bodies have one main socket and two inline pin inserts (E) which clearly illustrated from the top with two additional terminal contacts other than the main X-sync (C).

OM2n_hotshoe.jpg
Important: Shoe 4 should be the correct shoe type for all OM2n/OM-1n' bodies.

It permits TTL OTF AUTO flash, normal auto and manual flash exposure control (In the case of OM1n, only normal AUTO flash and manual mode is possible); further, both models will automatically sets X-sync at the shoe, and via a third contact to provide viewfinder flash ready/sufficient flash LED.

hotshoe.jpg socket.jpg

In most cases, by looking at the hotshoe we should be able to determine the model within a series. But since it is a removable type, that can be difficult to make a conclusion. Please take note of the sole pin inside the socket (2nd photo). The far right is a OM-2n accessory shoe socket with two extra pin inserts and it indicates it would require Shoe Type 4.

Terminal

Flash Lamp

Shutter Speeds

To Operate: Turn the red dot to "FP" for use with FP type bulbs and to "X" with electronic flash, M or MF type bulbs. With FP type bulbs any shutter speed up to 1/1000 sec. can be set, and with electronic flash the shutter can be set up to 1/60 sec.

1000

500

250

125

60

30

15

8

4

2

1

FP

FP

 

 

 

 

 

 

 

 

 

 

 

X

Electronic Flash

 

 

 

 

 

 

 

 

 

 

 

MF

 

 

 

 

 

 

 

 

 

 

 

M : FP

 

 

 

 

 

 

 

 

 

 

 

Early OM2 would still require the user to hand set the mode selctor switch to either FP or X when using bulb or electronic flash. The OM1n & OM-2N bodies that introduced later has improved this, in the case when used with an Accessory Shoe 4, it will auto-sync in X, regardless of the position of the FP/X switch.

shutterscle.jpg
For those who wants to use speed slow than the default X-sync speed, you can use a tape to cover the the secondary contact on the hotshoe.The highly portable older Quick Auto 310 or T series flash units, T-32 in particular where it replaced the Quick AUTO model can make use of a Power Bounce Grip and bracket and convert it into a "lively" handle flash which can also offers extra flexibility in bounce and tilt functions.

AUTO310.gif

MultiSetup.gif

Unit displayed in these few illustrations (Except pix at far right) is using Quick Auto 310. T32 flash has a separate site with operation manual at another section.

That was the early days of TTL auto flash, the OM Flash Photo Group has evolved over the years into a very comprehensive system. The Quick Auto 310 has been replaced with a series of T-series flashes. Which comprised of a big, powerful handle electronic flash T45, and two compact portable flash models, the T32 and T20. There was another specialized Macro Ring flash T10 and joined by another two macro flash, T8 Flash 2 and T28 Twin/Single flash units. All these models feature both TTL "OTF" Auto and Manual operation, the T10 Ring Flash came with T-Power Control unit, The mode is selected automatically by the camera mode selector lever on the top of the OM-2. All provide the OM cameras' exclusive viewfinder indication of full flash charge and exposure correct flash confirmation as well as featuring automatic 'A" synchronization when the Accessory Shoe 4 hot shoe contact is used. Among all camera manufacturers, the OM Flash Photo Group is the most impressive, flexible and has the widest selection of choices. The T32 and T20 was so well spec-out that it needs little improvement over the last 20 years except in expanding its capabilities with system accessories.

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Shared Resources: Supplementary articles: TTL Metering, Depth of Field, Shutter Speed & Aperture
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