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    Default Homemade troubles....



    I'm working on a PVC telescope and I'm running into troubles fitting the lenses. The objective lens is 50 mm, but the housing is 2 inches. Now, in the conversion between Imperial and Metric, the lens is a little too small. Has anybody run into this problem before, and what did you do to remedy the situation?

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    I've tried to make pipe-based scopes in the past. One thing I've tried is to cut slots lengthwise into the end of the pipe and put a clamp around it to tighten the end of the pipe and make it clamp onto the lens. Trouble is, you have 8mm of diameter to take up, which is a full inch of circumference. That's a bit much for this technique, I think. I used saw kerf slots. You would need wider slots, that are tapered to avoid overstressing the pipe where the clamp bends it.

    Another thought is to glue blocks inside the PVC to hold the lens. You probably won't be able to find a fitting that goes inside the pipe (most PVC pipe fittings are female and go outside the pipe), but you can cut several pieces of PVC (I'd recommend three to avoid wobbling) and glue them inside the pipe to support the lens. The trick is going to be to get the alignment of the support blocks just right so that the axis of the lens is straight down the axis of the pipe. Otherwise, the result will not be collimated.

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