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Olympus OM-40 35mm slr camera

The Olympus OM-40 was the top camera in the Olympus manual focus amateur offering in the early 1980’s.

The first in the line was the OM-10 which featured only aperture priority auto exposure (although a manual adapter was made available as an option to plug in and allow shutter speeds to be also set). The next model was the OM-20 which had both manual and aperture priority exposure modes and this was followed by the OM-30 which had a primitive auto focus system. The OM-40 which followed was manual focus only, but offered Program mode, Aperture Priority, Manual mode and switchable matrix metering.

Olympus OM-40 Images

My Olympus OM-40 Camera

I purchased this camera from a charity shop on eBay for £7-50 in unknown condition. I’ve worked on the OM-1 and OM-2 pro series, and also the OM-10 and found them to be pretty easy to get going if they are faulty, so I thought it wouldn’t be much of a gamble to pay such a small amount for what is a very nice camera.

As it happens, when the camera turned up I only needed to fit a new set of batteries and everything sprang to life and the camera seems to work perfectly. Since I didn’t get a lens with the camera (that would probably be asking too much for £7-50), I used the lens from my OM-2 for the purposes of the pictures above.

The only cosmetic problem with the camera is a very slight scratch on the black of the top cover just above the strap connector on the film advance side, and the black padded covering has a slightly milky look, which I think is common with this model. I think it may be possible to blacken it up again with one of the products used to do a similar job on black car trim.

Olympus OM-40 Description

As I said above the OM-40 is a manual focus, 35mm slr with various exposure modes, pattern or ‘off the film’ metering, DX coded automatic film speed selection and an improved viewfinder display. It was the top camera in the manual focus OM-xx series.

The general styling of the camera is a bit different from the other cameras in the double digit series. The body covering is more padded and there is a noticeable hand grip fitted, a bit like the OM-20 but with a softer feel.


The basic control layout of the OM-40 top panel is similar to the OM-2, with a mode switch on the left hand side and a large exposure compensation dial on the right hand side.

The mode switch has more options available on the OM-40 because as well as the Auto and Manual modes there is also a P or Program mode. Similarly, the exposure compensation dial has an additional function to it’s OM-2 counterpart because it can set the camera to use the film speed set on the DX code rather than setting it manually. The shutter speed selection is made with a switch fitted around the lens mount and is characteristic of the OM series.

The Exposure compensation dial also doubles as the film speed dial, as on the OM-2 and it is by changing the film speed setting that the exposure compensation is applied. Because of that, when the camera is set to use the DX coding on the film canister it isn’t possible to apply any compensation. For this reason I think I would probably always override the DX coding and apply the ISO manually.


As well as the addition of the Program mode, I guess the other stand out feature of the OM-40 was the inclusion of the additional metering mode called ‘ESP’ (Electro-Selective Pattern) which is selected by a switch at the side of the prism housing.

This is an early form of matrix or pattern metering, where the camera measures light from several regions and tries to determine how to calculate the best exposure. Later cameras have sophisticated schemes with hundreds of different regions, but the OM-40 just measures the middle and the rest of the frame to make that decision. There is also the very accurate Olympus ‘off the film’ measurement where the camera measures the light reflected from the film surface during the exposure.


The viewfinder is typical of the OM series; big and bright and with a central split focus aid to help nail the focus. The information in the display is pretty good when in auto or program mode because the shutter speed the camera has selected is shown down the left hand side.

In manual mode however the display just shows what the camera thinks you should use so you have to transfer this reading the the actual shutter speed dial. This is not a simple operation because the shutter speed dial is hidden from view by the prism overhang, so you need to turn the camera round and view it from the front. I suspect I’ll be shooting in Aperture Priority mode!

Other features

The self timer switch is fitted to the top of the camera above the film advance and is automatically cancelled when the film advance is operated. This makes sure you have to set it every time you want to use it which is quite a neat idea.

One thing which is missing is an on/off switch which is why  the camera has a reputation for getting through batteries very quickly. I’m just about to load some film and try out the ESP metering and program mode – If I find the batteries drain quickly I’ll update this post.

Olympus OM-40 Specifications

  • Olympus OM-40 35mm manual focus slr
  • Aperture priority, Program mode and manual exposure
  • Metering by OTF or ESP
  • 1 sec to 1/1000 + B shutter speed
  • +/- 2 stops exposure compensation (not with DX film)
  • ASA range 25 to 3200
  • Powered by two SR44 batteries (easily available)
  • Electronic self timer approx 10 sec
  • OM bayonet mount lens
  • Optional motor drive unit available
  • Split rangefinder focusing aid
  • LED Shutter speed indication in viewfinder
  • Hot shoe sync socket
  • Ser No: 1096581
  • Manual available here.

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I’m a software developer by profession but I’ve been taking pictures since I was about 8 years old. In that time I’ve owned cameras of all types and sizes from 120 roll film thro’ 35mm to my current Pentax K-5, Ricoh GXR + P10/S10/A12 28mm/A12 50mm, Canon S95 and recently acquired Sony NEX 6.

  1. D Jones says:

    I had the OM1 and OM2n back in the day loved the camera system I only changed because the lugs for speed Control were to small for my hands.

  2. cameraseeker says:

    Hi Simon,

    I got one of these off ebay in February with no rubber covering for £6.50. I found that setting it to B on Manual disables the meter. If you need to take a photo all you need to do is turn the dial to program. I’m still on my first set of batteries.

  3. David Murray says:

    Thank you for that advice cameraseeker, I’m considering an OM40 for street photography in P or AE.

  4. Dennis says:

    I just wanted to thank you for doing a helpful review, with the right amount of detail, for me at least.

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