Keks EM-01 Light Meter

The variety of different cameras available is one of the great pleasures of shooting film. However, they often have light meters which are broken, difficult to use, or which simply don’t exist in the first place. The Keks EM-01 is a shoe-mounted light meter which aims to provide a solution, and help folks get the most out of their older film bodies.

Helios 44M
My Pentax Spotmatic F with the Keks EM-01 mounted.

Feature Spec

  • Modes: Aperture or Shutter priority.
  • Metering: 30º average metering (reflected light).
  • Display: 0.91″ OLED
  • Battery: Internal, rechargeable via USB C.
  • Aperture Range: f1 – f64 in 1/3 stop increments.
  • Shutter Speed Range: 30s – 1/6400s in 1/3 stop increments.
  • ISO Range: 50 to 8000 in 1/3 stop increments.
  • Colours: Black or silver.

Keks EM-01 light meter

Shoe Connection

The EM-01 fits onto a camera using a shoe-mount. As there is no electronic connection with the camera, that means it can either be a hot or cold shoe. One of the cool things about the EM-01 is that the shoe mount can be removed and re-positioned. Not only does this mean that different sizes of shoe-mounts are catered for, but that you can also set them in such a way that best suits the layout of your particular camera. For example, slightly off to the side on a Leica rangefinder, so that it doesn’t overlap the shutter speed dial.

The earlier versions of the meter came with 3 differently sized plastic mounts, but the later versions came with an additional 6 aluminium mounts. If you bought before the upgraded version was available you could get a set of the 3 metal mounts for $5 on the Keks site. There are differing views on what mount is better in which situation… in that the plastic connection is much more likely to break off, whereas the alumiunium mount could place more stress on the camera as opposed to the meter in the event that tension was applied. Personally, I think the risk of the plastic snapping due to an unfortunately timed bash and losing the meter is greater than the camera’s shoe-mount getting damaged, so I’ve stuck with using the aluminium mount – but the plastic one seems perfectly sturdy.


Unlike some other comparable products, the display of the EM-01 is nice and bright, meaning it is visible even in bright daylight. There’s no visible flickering or other issues. Positioning wise, the display is located on the rear of the device (as opposed to the top)… and there’s some debate over which is better. To be honest, I think that both have their strengths. Having the display on the back means that you don’t need to flip the camera over to change the settings, but if you’re shooting from the hip, or out doing street photography, having the meter on the top can be handier. Either way, it’s something that you adapt to quickly and don’t really think about.

35mm self portrait

Things to watch out for

  1. Shoe mount only – This might seem obvious, but as it is shoe-mounted, that means you are limited to using cameras which actually have a shoe mount. At first you probably just assume that most do, but then you realise that quite a lot don’t, or have them in weird places. For example, none of the Hasselblad 500CM, Rolleiflex 2.8F, Canon 7, and early Spotmatic models have shoe mounts that can hold the meter. Enterprising folks have found solutions (such as a neat 3d printed mount which connects to the Canon 7 sync port), but it is something to consider. I’ve been carrying the meter in my pocket when I can’t connect it to a particular camera, and almost lost it a few times as a result. I wish it had a clip that I could connect to a lanyard or something to avoid this.
  2. Rollei 35 – The Rollei 35 deserves its own mention because while it does have a shoe-mount, it is on the bottom of the camera. This means that the read-out of the meter is upside down. Keks have released a special version of the meter which has the display flipped, but to be honest that seems a bit cheeky to me. Having to buy an entirely separate (and not cheap) meter for something which should be a software feature is a poor show.
  3. Range limitations – I wish the range of the meter was a bit greater. There are lots of weird ISO films that come in at like ISO32, or even ISO8 which I’d like to try out, but simply can’t meter accurately – and the Keks doesn’t help, given its lowest setting is ISO50. Similarly, it would be nice (though clearly not essential) if the aperture values included f0.95, for those of us with the dream lens. Though to be fair, that 0.05 of a difference will make almost zero difference to the outcome.
  4. Mount – The mount is connected to the meter with three metal hex screw things (the actual name escapes me). While this means the connection is nice and secure, it does also mean that it’s a real pain to switch the position of the mount for different cameras. This alone has put me off using it on my M2 more than a few times, as I’ve got it set up for my Nikon rangefinder, and can’t be bothered going through the hassle of having to detach and re-attach. A small thing, sure. But still something that gets in the way.
  5. Display info – This might just be me showing my lack of understanding of light meters, but I would prefer to have a display option which doesn’t show the EV and LX values by default, to make the Shutter/Aperture/ISO values larger – as I don’t use the former often, if at all.

Keks EM-01 light meter

 My Experience

This is the kind of device that I love the look of, but wonder whether I really need – especially at the price point. Coming in at £140 from the UK stockists, the Keks is not cheap – and I didn’t think I could justify that when I have been metering perfectly fine in my head for the best part of 20 years. However, after a failed experiment with a cheaper option, I decided to give the Keks a bash, and I am glad I did. The build quality seems solid, and is far nicer than the alternatives I’ve seen… the battery life is also great (I can’t remember ever charging it). Having a meter available on-hand gives me more of a confidence that I’ll be ready to shoot in varying conditions, and so it hasn’t really left my camera since.

Keks EM-01 light meter

Cost and Availability

These things are available direct from the Keks site for around 110USD (slightly more with the aluminium mount), though they appear to ship from Taiwan. You can get them at shops like Latent Image in the UK for £140, but they are often in pre-order. Overall, this is a pretty expensive item, and while it can be extremely useful, the shoe-mount implementation does mean that it limits what cameras you can use it most effectively with – so you need to do your research beforehand to make sure it will be worth the cost for your particular situation.


Since this is a photo blog… here are some film pictures I’ve shot with the light meter, on various cameras. YMMV.

Glasgow street 35mm selfie

35mm black and white

Glasgow street 35mm

Glasgow street 35mm

Glasgow street 35mm

2 thoughts on “Keks EM-01 Light Meter

  1. Great info. I’ve been thinking of buying this one for many of my cameras that don’t have a meter but like you said, a lot of my cameras don’t have a shoe mount either.

    1. I hummed and hawwed for ages, but it’s a great tool. I’m glad I took the plunge.

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