Pentax 6x7 - Custom Lumicon "300mm f4" Projector Lens - Samples
We always love to see items that have been built or modified by folks in the film community. Here we have what appears to be a projection lens, simply marked "Lumicon," attached to a series of Pentax 6x7 extension tubes and a helical focusing adapter. The result is an almost comically long but surprisingly lightweight telephoto optic. Of course, we knew we had to try out this one-of-a-kind beast before it finds its new home. Comparing it to other lenses in the shop, we figure the "Lumicon" is around a 300mm f4 in this configuration. By adding or removing sections of the tubes, infinity focus and close-up shots are possible. Surprisingly, center sharpness is impressive, rendering substantial detail. However, image quality falls off dramatically towards the edge of the frame, resulting in a "smearing" surrounding the center. The most notable characteristic of this "Lumicon" lens is the perfectly circular bokeh it creates in out-of-focus zones, an attribute produced by the complete lack of an aperture mechanism. Overall, we found the "Lumicon" to be a remarkably capable portrait lens, as long as the subject is centered in the frame.
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