RASC TV Lens Members

This set of posts is about the TV Lens we were generously given by CTV to make into scopes.

Myself excluded, most people with these will need to make a tripod, and some kind of mount, probably a fork mount for sake of simplicity.

I recently acquired a planer as well as a second table saw that I can keep in Vancouver, so I have enough tools to build parts for people without such tools for the cost of material.

The tripods can be made of 2 X 6 lumber cut at an angle for legs, two pieces of plywood glued together for the mating plate. Door hinges can be used for the tops of the legs and a chain connected to eye bolts to prevent the tripod from collapsing.

The fork is a special problem. Mine is made out of a piece of aluminum tubing rectangular in cross-section. To make the U shape, I  cut 22.5 degree wedges of material out, bent it to shape and had it welded by Pro-Tec Marine Welding in North Vancouver for $140. I didn’t cut through completely, but left the cut so that one side of material was still there and with enough room between the cuts so that when they were brought together, a proper weld with filler rod could be done. Mine ended up being not quite parallel but close enough I can probably cold-set them.

One problem with this lens is where the focus comes to. I think it may be too close to the last lens element to make for a convenient position, so I think some kind of negative lens element is needed to add some back focus distance.Lens Front

1 thought on “RASC TV Lens Members”

  1. I have 4 more of these TV lenses in my basement that are free to any members. I need to move them out as soon as I can as we will be renovating the basement this summer and they must go!

    Craig

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