Mount the lens on the EOS body and set the aperture as normal.Now you can stop down an EOS lens by the following procedure: Since this is a macro only adapter (more on this below), you'd almost always want to be stopped down. Consequently, if you mount any EOS lens on this adapter it will be wide open. You can't change the aperture setting of an EOS lens unless there's an electrical contact with the camera. However it is an issue when it comes to aperture. Now no contacts isn't a problem for focus because you can (indeed you have to) use manual focus. However - and here's the rub - there are no electrical contacts. The other side of the adapter has a standard EOS body mount so you can mount any canon lens onto it. On one side of the adapter is a standard Canon EOS lens flange so the adapter mounts on the camera just like a normal lens. Left: tilted up, Right: 180 degrees rotation to tilted down There are click stops at 30 degree angles, but you can rotate the adapter between the click stops if you wish. This adapter has a fixed angle of tilt - around 8 degrees - but that angle can be rotated so that the lens can point up, down, left or right (or anything in between!). This is more easily seen by example as shown below: What you're doing is just tilting the plane of focus so that it more closely matches the plane of the object you're trying to get in focus in a photograph. This is shown in the diagram below.įor the technically inclined (no pun intended) the angle of tilt of the lens (theta) is related to the angle of tilt of the plane of focus (alpha) by the relationship:īy tilting a lens you don't increase the depth of field, though sometimes it can appear that way. down, right, left), the plane of focus also tilts. In simple terms, if the lens is tilted (up. The idea behind this adapter (designed by Hartblei, a Ukrainian optics company) is the Scheimpflug principle, which describes the orientation of the plane of focus of an optical system when the lens plane is not parallel to the image plane.
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