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For cameras with full frame sensors, they cannot properly use a lens designed for use with an APS-C sensored camera. The image circle produced by the lens is just not big enough to cover the full frame sensor.

It is also worth noting that manufacturers can license a lens mount. For example, Fuji produced several DSLR cameras that used the Nikon F mount. And Kodak produced a couple of cameras that were available in both Canon EF and Nikon F mount versions.

The "screw driver" is spring loaded, so you can mount lenses without it scratching the mount as you rotate the lens to lock it in place. On the lens you can see the corresponding "screw" that the "screw driver" slots into.

The first acts like an extension tube, so the lens can focus closer, but you lose infinity focus (can't focus on things further away).

It won't work the other way round, of course. You can't have an adapter that removes 26.21 mm from the Pentax K mount to allow you to use micro four thirds lenses. The lenses would have to go inside the mount!

The CPU contacts on the lens and lens mount connect together so that the camera can communicate information to the lens. In the examples above you can see Nikon uses spring loaded pins in the lens, while Canon uses spring loaded pins in the camera. When the lens is locked into position, the pins touch the contacts to allow electrical signals between the body and lens.

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Some lens mounts use a purely electronic connection to the lens, while other mounts use a combination of electronic and mechanical connections. Below you can see a Canon EF mount lens, and the EF mount on the camera. The Canon EF mount is an electronic mount.

Nikon meanwhile uses a combination electronic and mechanical mount. Below you can see a Nikon F mount lens and the F mount on the camera.

Each camera manufacturer typically produces lenses designed only for their own lens mounts. There are also a number of third party manufacturers who produce lenses for a variety of mounts. The main lens manufacturers are Sigma, Tokina, and Tamron.

Although these manufacturers produce lenses in multiple mounts, the mount on the lens is not interchangeable. So you can't buy a Sigma lens designed for use with Canon EF mount and then use it on a Nikon F mount camera. Instead you'd need to buy the Nikon F mount version of the lens.

So if you buy a lens that relies on the screw drive motor of the camera body, but the camera body doesn't have a motor, then you won't be able to autofocus with that lens.

Canon's EF mount uses a purely electronic linkage with the lens, so all lenses for the EF mount contain a built in focus motor.

So if you have a full frame camera, or might want to purchase one in the future, you need to consider this when looking at lenses.

With Pentax cameras, you don't (currently) need to worry about whether a lens will be compatible with your camera or not. All Pentax DSLRs use an APS-C sized sensor, and so are compatible with lenses that use the K mount, whether they cover APS-C or full frame.

Some lenses feature built in autofocus motors, while other lenses use what's known as a screw drive, which is driven by a motor in the camera body. Not all camera bodies feature screw drive motors.

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But, the sensor size used in the first DSLRs (and still used in many today) was smaller than a frame of 35mm film used in film SLRs. This was mostly due to the high costs of large sensor fabrication.

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The number and placement of CPU contacts varies between each type of lens mount. Also, the signals sent through the contacts is different.

Tagged with Digital Single Lens Reflex cameras, DSLRS, Flange distance, Interchangeable Lenses, Lens mount adapters, Lens mounts, MILCs, Mirrorless cameras, Single Lens Translucent Cameras, SLTs, Using old manual lenses

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But if you have or are thinking of buying a camera with the Canon EF, Nikon F, Sony A, or Pentax K mount, then this section is worth a read.

For example, the Micro four thirds lens mount has a flange distance of 19.25 mm, while the Pentax K mount has a flange distance of 45.46 mm. So, by using an adapter with a width of 26.21 mm (19.25 + 26.21 = 45.46), a Pentax K mount lens can be used on a micro four thirds lens mount.

Note that Tokina do not have a special designation to show that the lens features a built in motor. Similarly, some Sigma and Tamron lenses may have a built in motor but not feature the HSM / PZD / USD designations. (The designations actually refer to the type of autofocus motor used in the lens).

The other type of adapter includes corrective glass, so you retain infinity focus. This usually works like a teleconverter, so the image is magnified / cropped compared to what it should be. The extra glass in these adapters usually reduces image quality as well.

If you are considering purchasing a camera that accepts interchangeable lenses, you need to be aware of compatibility issues. Buying a camera and lens and then finding they don't work properly together could be quite annoying.

In this article we'll look at the different compatibility issues you might come across, and also how some cameras can be used with a wider range of lenses via adapters.

Pentax's KAF2 mount provides a screw drive motor and works with K mount lenses that have a built in focus motor as well.

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As a general rule, a lens mount with a smaller flange distance can use lenses designed for use with a mount with a larger flange distance, provided the correct adapter is used. The exception to this is with some lenses where the rear protrudes back inside the camera. These can cause a problem with DSLRs and SLTs as the rear of the lens might hit against the camera's mirror.

So if you might be interested in using older manual lenses with your digital camera, it is a good idea to check the flange distance for the mount of the camera you are looking at. You can see a good list of different lens mounts and their flange distances at Wikipedia: Flange focal distance.

The main issue is the coverage of the lens. When digital cameras were first introduced, most of the manufacturers (with the exception of Olympus) carried on using the same lens mounts they had been using for their film cameras.

Another thing to note is that the camera manufacturers also produce different versions of their lenses and lens mounts that are not fully compatible with each other.

So it is best the check the specification of the lens if you want to be sure whether or not it includes a built in autofocus motor. All Canon and third party autofocus lenses for the Canon EF mount feature a built-in focus motor.

Both Nikon and Sony vary as to whether their camera bodies include a built in screw drive motor. Some do, some don't. Typically their cheapest models don't include a built in motor, and will only autofocus with lenses that have a built in motor.

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The first thing to note is that each camera manufacturer typically has their own lens mount that they use on their cameras.

For example, a Canon 600D DSLR has an APS-C sized sensor and uses the Canon EF mount. It can accept lenses that use the EF mount and are designed for use with APS-C sized sensors (EF-S / Di II / DC / DX depending on the lens manufacturer). It can also accept lenses that use the EF mount and are designed for use with 35mm film cameras or full frame digital cameras.

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It is also important to remember that when you buy into a camera that offers interchangeable lenses, you are buying into a system. So you need to consider carefully the range of lenses available in that system.

On Canon EF-S lenses, they modified the mount on the lens slightly, so they cannot be mounted on a full frame camera with EF mount. For Sony and Nikon, their DT and DX lenses can be mounted on full frame cameras, and the camera will crop the images to the same size as an APS-C sensor.

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Mechanical mounts like the Nikon F mount often have an aperture lever. This is to allow controlling the aperture of the lens from the camera. Electronic mounts still allow this, just the control is done via sending an electrical signal to the lens rather than mechanically.

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Mirrorless cameras tend to have quite a short flange distance because they don't need any room behind the lens mount for a mirror. This has made them quite popular for mounting old lenses on, and there are a wide range of adapters for using different mount lenses on the micro four thirds and Sony E mount (NEX) cameras.

Some mechanical mounts feature a screw drive motor used for autofocusing the lens. (See section below on Autofocus motors for more information). In the Nikon F mount photo, the camera was set to manual focus, and so the "screw driver" is recessed in the body, in autofocus mode it would pop out.

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The lens mount a camera uses affects what lenses you can use with that camera. Most lens mounts have a wide range of different lenses available, and so consideration of the lens mount is not particularly important.

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These sorts of adapters are only available for lens mounts where there is a small difference between the two flange distances. A common one is an adapter that lets you use Canon FD mount lenses on a Canon EF mount body. The FD mount has a flange distance of 42 mm, while the EF mount has a flange distance of 44 mm.

The image sensors used in DSLRs were about the same size as a piece of APS-C film. So they are known as APS-C sized sensors.

Different lens mounts use a different flange distance. The flange distance, also known as the register distance, is the distance between the lens mount and the camera sensor (where the rays from the lens will be focused).

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A camera with a short flange distance can use lenses meant for a camera with a larger flange distance by use of an adapter. The adapter adds the extra distance needed so that the lens can focus correctly.

For cameras with APS-C sized sensors, they can accept both 'designed for APS-C' lenses, and lenses designed to cover the image circle covered by 35mm film (full frame).

After a while, the manufacturers started to produce lenses specially to fit the reduced sensor size of their digital cameras. This made the lenses smaller and cheaper to manufacture. These lenses covered the smaller size of the digital sensors, but did not produce an image circle large enough to cover a frame of 35mm film.

However, the lens mount does become more important if you are looking to use older (and cheaper) manual lenses. It is also important when buying a lens to check that it is compatible with your camera. For most people though, the type of lens mount a camera uses is worth considering, but probably quite far down on the list of important features.

However, you can (in some cases) get adapters that let you use a lens designed for a lens mount with a shorter flange distance than the mount your camera uses. There are two types of these adapters.

The four thirds, micro four thirds, Nikon CX, Sony E, and Samsung NX mounts are all new 'designed for digital' mounts that have no hold-over from the days of film cameras. So if you have or are thinking buying a camera with one of these mounts, you can safely skip over this section.

Most lens mounts use a pin on the camera body that inserts into a hole on the lens to lock the lens in place. To remove the lens, press the lens release button on the camera body. This retracts the locking pin. With the button held down, you can then rotate the lens back and remove it from the camera.

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You can't use a lens designed for one lens mount on a different lens mount as the lens just won't fit. E.g. you can't use a Canon lens on a Nikon camera. Sometimes an a adapter can be used, but we'll look at this later.

After a few years, technology improved, and it became possible to produce full frame image sensors, the same size as a frame of 35mm film at a reasonable cost. And so we today have a situation where cameras with different sensor sizes both use the same lens mount, and lenses designed for different sensor sizes both use the same lens mount.

All current lens mounts use a bayonet type fitting. You line up a marking on the lens with a marking on the camera body, and the lens can then be slotted into the mount on the camera. Then the lens is rotated (whether left or right depends on the lens mount), until it locks into place.

Of course, cropping the image means you loose image data compared to what you would capture with a lens designed for use with full frame cameras. A DT lens used on the 24.6MP Sony A900 will only produce an 11MP image. The rest of the image has to be cropped away to compensate for the lens' reduced image circle.

As a note to the above table, Samsung produced a couple of K mount lenses for use with APS-C sized sensors, but their lenses are not specifically labeled as such. Samsung also licensed the Schneider-Kreuznach name for use on some re-badged Pentax K mount lenses, again these lenses are not labeled as to whether they are designed for use with APS-C cameras.

There are a large number of old lenses designed for use with lens mounts that are no longer in common use. That means these lenses can often be picked up fairly cheap. When used on a different lens mount via an adapter, they will always be manual focus, and you will also need to control the aperture manually. (Old lenses have an aperture ring you use to set the aperture).

The automatic cropping of lenses designed for use with APS-C sized sensors on a full frame camera can be disabled. This gives you a good idea of the reduced image circle that these lenses offer when cropping is disabled: