Re: How do you mount a reversed 50?

[Pat White]

The reverse adapter has a K-mount on one side, and a filter thread on the 
other side, so you can attach the adapter to the front of the lens, and then 
carefully attach the lens and adapter to the camera.  Lens settings are 
completely manual, since the lens mount is not connected to the camera, 
although you can use aperture priority if you like.  Normal TTL metering 
will work.  It's an inexpensive way to get high magnification, and you can 
use a few different lenses.  The adapters come in 49mm size as well as 52mm.

With this type of setup, there's no focusing.  You move the camera back and 
forth until the subject is in focus.  You can get slightly different 
magnification depending on whether the lens is set at minimum focus or at 
infinity.  You can get more magnification by adding a filter (UV or 
Skylight, for example) between the lens and the adapter.  The 50mm lens will 
enable full-frame photos of quite small objects, and a 28mm lens will enable 
full-frame photos of really small objects.  By "quite small" and "really 
small" I'm referring to stamp- and coin-sized objects.

One cool thing about it is that you can leave the adapter in your camera bag 
for unexpected macrophoto opportunities.  "What kind of bug is that?"  "Just 
a minute, I'll pop on my reverse adapter and take a picture of it!"

Pat White