Snod35 V1 - Vibration Assembly
The principle behind the vibration assembly is simple in theory. The key idea is to keep the focusing element in constant motion so that any grain that is on (or within) the focusing element will become less visiable. The trick is to only move the focusing element along the x axis (side to side) and y axis (up and down), but not along the z axis (front to back). Any movement along the z axis will cause the focusing element to move outside of the focusing plane of the lens, and will thus cause the final image to be blurry and out of focus.
I have tried syringe pistons and various other items with my design (below at left), but found that 6-32 nylon threaded rod (smallparts.com #TRN-0632-36) provided the best results. The image at center shows the main parts of the vibration assembly. The larger black circle, made from 1/8" thick plastic, is the base of the assembly and is secured tightly into place inside the adapter. The small black circular piece, made from 1/16" thick plastic, is the piece that holds the Sanko motor and the focusing element (I'll go into detail about the focusing element later). The small holes in the circular plastic pieces are passageways for the wires. Each of the three lengths of threaded rod is secured to the base using 6-32 nylon nuts (smallparts.com #HNN-0632-25). The image below at right shows the assembly together with the base secured inside the housing of an 72mm Asian +10 macro lens. Grommets can also be used instead of the nylon nuts here, but I found the vibration pattern to be slightly less effective this way.
)
)
)
The image below at left shows the the plastic piece that holds the focusing element and the motor. I carefully cut and filed the rectangular shape from the center of the plastic piece so that the focusing element is a perfect fit. I drilled four very small holes along the edge of the cut-out rectangle and used 1-72 X 3/8" machine screws and 1-72 nuts to squeeze 2-56 nylon nuts (smallparts.com #HNN-0256-25) against the focusing element. With the screws tightened, the focusing element is nice and snug in the holder. Three small 1/8" (inside diameter) grommets (westernrubber.com #MR-200-1098) are used on the focusing element holder. The threaded rod fits snuggly into the grommets. Using grommets instead of nuts here makes it easy to adjust the distance between the focusing element to the 35mm lens. Since this distance differs slightly between lens brands, being able to adjust the focusing element's location allows me to use more than one lens brand with little trouble.
)
)
)
The image above at center shows the back of the focusing element holder. The image above at right shows the finished adapter with the vibration assembly inside.
)
)
)
The image above at left shows the 72mm Asian +10 macro lens (eBay) with the lens removed from the housing. The thin ring is threaded and holds the glass in place. The vibration assembly base is cut to fit snuggly into the macro housing. The thin threaded ring is then tightened back down to hold the base in place (the macro glass is not used). The image at center shows a lens spanner which is used to screw and unscrew the thin ring from the macro housing. The image at right shows a DIY lens spanner tool that I made from PVC and drywall screws.
PREV
HBE main