I have to cut down that telescope's barrel so it matches the focal length of the objective lens. I looked up the best ways to cut pvc pipe, and one unique method caught my eye: using a piece of string, and sawing back and forth.
The method: cut a notch in the pipe, attach both ends of string to makeshift handles, and get to sawing.
Well, it works. It would take a long time, but you could do it.
The problem is that tiny specks of plastic, too small for the eye to see, start flying through the air. Some landed on my hands, producing the most powerful itch I have ever experienced-- about on the level of a poison ivy itch. As a side note, what they sell as itching powder in the gag catalogs is similar: powdered nylon.
I suspect that the YouTubers that put up those videos figured "OK, I made myself miserable, so I'll just pass it on."
I prefer the YouTube hacks that just plain don't work.
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Have you ever heard of silver saw? (Not sure how its spelled) my neighbor just told me aBout it as we were talking itch and bites moments and poison ivy came up.
Sure, your situation a good water n soap would probably do the trick
Pls send pic of your first finding when you get it done. ?
Zoohome
Level 8
Sep 22, 2018
0
How do you figure out the best length to make the tubes , for optimal clarity of the lenses ?
Cast1es
Level 9
Sep 22, 2018
0
It took me while to find the answer to this. The objective lens (the big lens in the front) focal length (in this case 255mm, or about 10 inches), is how long the telescope's barrel should be.
Focal length is usually supplied when you buy lenses. It can be calculated by having a light bulb in a dark room. Aim the lens at the bulb. Hold a piece of paper up, and move it until the image of the bulb is in focus. The distance between the lens and the paper is the focal length.
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