**There is no combination of pre-existing adapters that will allow you to use the lens with your camera.**

* **There is no pre-existing EF-MD adapter** that I am aware of. The [Flange Focal Distance][1] (FFD) of MD mount is 43.5mm, while the FFD of EF mount is 44mm. That's only 0.5mm for an adapter without optics. For a *hypothetical* adapter with optics, you'd likely be multiplying focal length by 1.4x, so 85mm → 128mm.

* **There is no pre-existing EF-M42 adapter** that I'm aware of (in case you thought to combine EF-M42 + M42-MD adapters). The FFD of EF is 44mm.  The FFD of M42 is 45.46mm. There is -1.45mm of space in which to place an adapter, and the EF mount is too large to sink into an M42 mount.

**The feasibility of modifying the lens depends on its specific construction and design.** Although there is no aperture or autofocus mechanism to complicate conversion, **I would not bother attempting conversion myself**, unless the lens was particularly cheap, like less than $10.

* **Converting to M42 is *not* as simple as just cutting some threads** because the FFD of M42 is 45.46mm. You would need to shorten the barrel by 1.46mm. Given the apparent design of the mount portion of the adapter, *just* shaving the barrel down would not work. However, since the lens is available in Nikon F mount, the built-in focusing mechanism probably has enough "play" to allow infinity focus after altering or replacing the mount.

* You can **cut off the threads and drill screw holes into a thin lens reversal adapter for MD mount.** (Search for "Minolta MD reverse ring". Look at the pictures to find the thinnest one available.) Since the FFD of MD and EF are similar, the lens would likely still focus to infinity.

* If you feel the lens is worth the additional cost, you can consider hiring someone else to do the conversion for you, as [Michael C recommends][2].

**I would opt for an entirely different lens** that works with your camera as-is or with a pre-existing adapter. Other lenses known for producing swirly bokeh include those in the Helios series. I have also encountered lenses that produce mild swirly bokeh that is most noticeable with foliage in the background. You may even already have one without having previously noticed the swirl.

**See also:**

* https://photo.stackexchange.com/q/62000/75526
* https://photo.stackexchange.com/q/105926/75526


  [1]: https://en.wikipedia.org/wiki/Flange_focal_distance
  [2]: https://photo.stackexchange.com/a/106639/75526