Step 8Conclusion
Some people are bothered by the lack of focus adjustment, but it really only limits the range of applications of the lens. For this type of macro, moving the camera back and forth is a pretty good focus method.
The same goes for the lack of an aperture iris control. You could easily make a Waterhouse Stop -- a piece of opaque material with a hole in it to reduce the lens aperture. For most of these lenses, you can probably just put the Waterhouse Stop in front of the lens, making it very easy to change between perfectly-circular apertures. That might be useful, but stopping down isn't going to make this lens compete with a lens designed for your camera.
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