How to use your Pentax 110 mount lens on a Sony E (NEX) camera body?

Sony E body + Pentax 110 lens

COMPATIBLE MF MA

It's possible to mount the lens, but it won't be able to fit all sensors.

This is mainly due to the fact that the Pentax 110 was originally designed for 110 (very small) size rolls, so although it can be adapted to the Sony NEX, it's uncertain whether it will be able to cover even the APS-C sensor.

Despite this, it's really fun to experiment with them, because the 110 lenses are among the smallest ones ever made. In our experience the 2.8/50 portrait version can be used even with a fullframe sensor (with considerable vignetting), the 18 and 24 mm ones can almost cover the APS-C sensor. All of them seemed to project a very sharp image.

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Terminology

In terms of compatibility, we distinguish four separate categories:

COMPATIBLE

PARTIALLY COMPATIBLE

COMPATIBLE IN THEORY

NOT COMPATIBLE

This means that you'll be able to apply the lens on the camera in question with a proper adapter, and full focus range will be available with it (often with aperture control too). If AF is supported, you'll see it in the description.

This means that due to the flange focal depth or other factor this conversion would be normally unfeasible, but with some compromises (e.g. using a speedbooster adapter) can be made possible.

This means that the flange focal depth should make mounting and using inifinty focus possible, but for some reason there are no adapter rings available or other factors make it unviable.

This means that you won't be able to mount your lens due to mechanical incompatibility or the difference in flange focal depth doesn't make inifinity focus possible. Although numerous lenses can be mounted on cameras without infinity focus, but this cannot be considered actual compatibility.

Additional information for compatible variations:

MAC

manual focus (on the lens, with its own control ring)

autofocus available (AF controlled by the camera body)

manual aperture control (on the lens, with its own control ring)

automatic aperture control (controlled by the camera body)

speedbooster (focal reducer) adapters are available

macro (variable length) adapters are available

tilt-shift (or other flexible) adapters can be used

If you'd like to read more in-depth about compatiblity, you'll need to get familiar with flange focal depth, see this article.