1384 How To Make Lenses Of Any Size Or Focal Length Easily And Cheaply
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- Опубліковано 11 вер 2024
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Hell, that is exactly why i like this channel. Not the lenses, but how you come up with brilliant little ideas, make a short video about it and throw it out for us to marvel at it!
How I would liked to have the money to have have a workshop, to make stuff and go experimenting with it.
And then being as cool and joyous to watch on video as Robert… 😊
Hang in there my guy. There's always hope to make your dreams come true as long as you still have breath. Do or die trying, otherwise what's the point?
I've been watching Rob since 2013 when he was annealing copper ink with the back of a teaspoon in his wife's kitchen. I remember wishing I could acquire the tools and the time to explore and experiment like him, but I was in such a dire situation financially, took me a long while for me to figure out how to not only climb out of my hole, but also take steps toward that dream.
Fast forward to today, and I'm currently waiting for my laser cutter to arrive in a couple days and super excited to get started on what on the next chapter of my life.
Armed with the knowledge and inspiration gathered from all of Rob's videos and so many other garage tinkerers on youtube, ready to step into a new era of exploration.
Good luck to you and may your dream come true too.
@@K9JT
And the Community, people like you, i think is now my second thing why love this channel. ❤️🔥
And I will do that
Thank you!
Join a makerspace:)
...the men's sheds has spread in a number of western countries. For us it's $50 a year , heaps of tools and the public donate tools and materials regularly from estates or when relocating I've noted .Australian idea originally.
wow - cheers mat4e and thanks for taking the time to say that but I more into your second thing - the community of folks on here - they are just plain awesome - I have been reading through the comments so many great ideas here
Nice. It might help clarity by first removing dissolved gases through boiling the water and reduce sticky bubbles by adding a tiny amount of soap to reduce the surface tension. sugar and or salt will change the refractive index shortening the focal length.
nice tips. mate - cheers
Rob you actually just stumbled on fluid lenses which an Oxford professor only came up with around 10 years ago lol! He used this concept to develop inexpensive glasses for the developing world which can be adjusted directly (no need for an optometrist for fancy set of glass lenses to test someones prescription) - fyi i believe he went with silicone oil after years of refinement, ‘Eye Josh’ was the name of the fellow.
lol - awesome mate - I must get some silicon oil lol
I've used a coil of transparent tubing for an almost Fresnel lens. Good video.
that's very clever - I am going to give that a try - cheers mate
Using glycerin (glycerol) will prevent evaporation but will change the refractive index a bit. Great idea Robert ! Cheers!
Or perhaps even clear epoxy once you have what you want all dialed in.
I have heard silicon oil too mate - but I have some glycerol so I could try that
what you are doing is something I had considered on mylar space blankets but with continuous pressure/suction to use as a solar focus mirror that can be adjusted on the fly as the sun moves to keep the concentration and position on something being heated.
you will really have to give that a go mate - it would be great to see - but you have inspired me there so I might beat you to it lol - the glove is down mate lol
@@ThinkingandTinkering I have been waiting to have land to set up a massive array anyway, which maybe by summer I will finally be able to do so. I can post a link to the idea, on discord, but basically its 1000s of tiny mirrors on rods that are adjusted all so they make a sort of fresnel array on each small box so it can be tilted two angles to follow both seasonal and daily sun to focus it on a central point, then build a glass chamber big enough I can keep the light from damaging the glass by spreading it out as it enters, and fill the chamber with argon and such, while smelting glass from sand and the like, sort of demonstrate how the heat energy we normally use oil to generate for solar cells can be replaced by sun power in a simple manner,
@@ThinkingandTinkering oh something from the James Webb telescope was that their mylar they have ridges running through it to do something or other when deployed and this is apparently achieved with heat, so I am guessing the process you used here could possibly be used on the mylar thermal too, as I have done something similar with 2 liter PET to make a new shape and quite rigid so making a reflector telescope might be possible, definitely want to look into that, as I want a bigger telescope than what I have already LOL
That's really cool. So many uses for them.
for sure mate
Would love to see you make more uses of this.
it's on my mind for sure
Making a telescope using water lenses sounds like a great idea. Before joining the lense halves sterilise each half. Fill the lense with distilled water. Remember as the temperature changes the lense will expand and contract altering the focal length. Thank you for showing how easy it is to make a lense. Now I know how to create a tear-drop canopy for my rebuilt model Kestral glider.
Cool way to make the lenses!
You can now start a camp fire with Water! The telescope would be awesome.
A ways awhile back, someone had made glasses for 3rd world countries out of water lenses that could be tuned on the spot to the right perscription by injecting the lens with more or less water.
I think I will gofer a telescope - I don't camp a lot lol
Do you have a reference link ?
Nice, hadn't thought about it this way. But the other way is using reflective mylar, a metal trash can lid and then the vacuum. Like the telescope that I have uses. A reflector dish. Big "hugh" light weight reflector dishes can be made
I just ordered a space blanket lol - cheers mate
Nice! Immediately came to mind if injecting clear, 2 parts epoxy, would cure well enough (and clear enough) to produce good solid lenses.
Cool idea! I wonder if you could compensate the lack of transparency with size of the lens ...
Other resins/thermoplastics would be better; it's done commercially, so you can get the specs and use the proper stuff.
I would think so mate - there are issues with that like degassing and heat when the epoxy cures - but I would think these could be overcome with a little practice and thought
Fabulous video, many thanks.
glad you liked it mate - cheers
Thats superb and so easy !!
cheers mate
Brilliant
cheers mate
Brilliant, bloody brilliant. Thanks.
Love it ❤️
Your the beast, mate! 🎉
awesome - cheers mate
Reminds me of the Indian water bottle in the roof... Could be a ultra slim and compact option possibly 🤔👌🏼🤘🏼👍🏼
litre of light I think it is called mate and it could well be - cheers
There's a guy named Dan Rojas (Green power science) here on UA-cam that did a water lens and a vacuum mylar reflector, among other interesting diy projects.
One platform he made stretching a PE sheet on a 4'x4' frame and filled a circle with water making a perfect parabolic lens. Instant fire, "death ray"
oh something else to, since you are using water, or a liquid to fill seems like a good way to make lenses that have circulating water being pumped slowly through them to carry away heat from large quantities of light being pushed through the lens so even at high enough amounts that a mostly non-reactive lens to the light is still reacting with a tiny bit enough to heat it, you can keep it nice and cool like they do in laser assemblies XD
for sure
magnifique!
cheers mate
Try using sheets of 5mm clear rubber and filling with water as you did. You can adjust the focal length and focus simply by pushing in more water or letting the rubber force out some of the water. Ie the big syringe can be pushed in or out to focus the item you want to look at or focus a beam of light into a long narrow beam or a wide beam. It is actually good fun doing this. Did it with pieces 20cm x 20 cm rubber. Amazing how fast you could get a piece of wood to catch alight in midday sunlight.
Excellent! Think i was waiting for finding semispherical glasses. . Solved. Thanks professor, you've got pretty good English pronunciation even when fast. By the way filling it with a bit of bleach will avoid algae forming. Saludos
That would make an awesome telescope if you can adjust it to where it magnifies more do you need a bigger lens or you just make a bigger dome
Really you need both as the higher the magnification factor the more light you need to collect. Hence Telescopic sites being for example 6x42 or 7x50 or 8 x 56 or 8x60. The same thing follows for binoculars.
Gordon has it mate - the limitation is really on light collection and the amount of available light
Haha ... Telescope was the first thing that sprang to mind when I read the title :)
Hhmmm now I have to work out the fluid combination to get as close to Apochromatic ... Where's that refractive index table ...
And a DIY microscope ❤️
nice - you will have to let me know what you work out!
in hindsight, if you still want to make the effort of making a telescope ( assuming you already sorted a system for the focuser - often expensive if any good ) you might want to try to use a long focal ratio such as say F7 or above, meaning the focal length divided by the diameter of the lens.
with longer focal length you stand a better chance of overcoming the said chromatic abberation and star bloating I mentioned above. on the downside the scope will gather light "slower" meaning that the images are less bright to the human eye.
Also a slower scope with a higher F ratio number will stand a better chance for showing the planets and yes, the moon in more detail. for larger objects like nebulae a faster scope is desired with preferably a large aperture and a shorter focal length.
you may get away compensating for lack of precision with size ... meaning that say a 15 cm lens may have an imperfect shape especially toward the edges and that can be "reduced" by making a peripherical obstruction of say 2 cm reducing the effective aperture to say 11 cm ...
I tried this with silver space sheet siliconed onto a round washing up bowl, as a mirror for my solar panel, but wow your method is fantastic, pure genius, shout from the kitchen an angry mum…….”where’s my washing up bowl” 😂
Now inject acrylic in it in place of water. mold a solid lense maybe.
nice idea
there have been several forest and car fires started around Florida from water bottles focusing the suns rays just right.. maybe if you capture steam and use that purified water in your spotless lens to make a telescope?
nice idea mate - cheers
If you want to make giant lenses you can do it with clear water bags hung in a circular net hammock.
that would be cool to see - you thinking of doing that?
Excellent video! Cheers! 👍
Thank you! Cheers!
Years ago I remember seeing adjustable glasses with water lens' fitted and syringes used to set the optical length These were supposed to be used in poor countries.
nice
Hahah, the optical accuracy will be enough to make a functional, but not perfect one, nice idea!
I am going to see if ic an make a telescope with it for sure - cheers
one time I was studying newtons book on optics & did a bunch of light experiments >> I wonder if ur lens will also work if u merely submerge the whole thing in water(simpler than trapping inside). I remember using cling wrap in a special jig. Pour water inside and adjust the jig.
When working with fluids & light the name of the game is how well ur fluid passes light.
Very old tellies had a big lens in front of the tube filled with some kind of fluid
I didn't know that mate - I wonder what the fluid was - some kind of oil?
Great way to make a mirror
for sure
Very very cool, only in concave version there will be manufacturing problems..but great, the other advantages are in the refractive index. Thx for the Vid.
I wonder where you got that PET sheet it's very tolerant of UV light, so would make great windows in a dome greenhouse or a cover for a pop can solar unit. I keep saying this but you should make a pop can solar unit.
it's OHP acetate mate - you can still buy it on amazon
I would like very much, to see that video when the telescope comes into life. And also how did you calculate the focal distance, for the lenses
Using different liquids and different curvatures of the lenses will give you a very wide array of lenses.
Genius!
wow - thank you mate
I challenge you to take this idea and make a Fresnel lens. 😁
oooh lol - the glove is down!
If could silver the surface seems like a decent way of getting a surface for a curved mirror too.
Perhaps a process akin to chemistry's "silver mirror test for ketones"?
nice idea mate
Mylar aluminized sheet works well.
What if you use epoxy instead of water? Would it work or perhaps some other cement/glue stuff?
I would love to see a telescope made like this.
me too!
You have to try out the old glass under the sun experiment and burn some stuff 👍😂
That's amazing. I do wonder : is the lens shape accurate in concept ? I mean if you perfect the process would it produce the near perfect lens or just an approximation ?
I don't know mate - but I really don't see why not with enough control
A telescope would be brilliant! I was just considering buying one a few days ago, however I am a HUGE FAN of recycling and DIY. Also, what are your thoughts on using a clear epoxy instead of water (once you have it dialed in of course)?
Expoxy releases heat on curing.... You probably don't want an epoxy lense to be too thick middle.
Thicker liquids like setting epoxy also have bigger problems with stubborn gas bubbles refusing to rise... . A sander can help separate the bubbles somewhat... Fix the sander to a sheet of ply, and then clamp container of setting liquid to that board. Board over edge of table and Run the sander. The shaking tends to dislodge the bubbles, so they rise to top surface.
I have been thinking about both of those things mate - it's likely I will grab some clear cast
I understand this material alarm off distortion any snow perfectly even but it would be really cool to see it done with a very large lens like let's say 50 cm
If you use a vacuum pump, can you put a sheet LED light in the box to measure the focal length of one side as you make it and calculate the final focal length?
This video didn't have as much lead in to it, but that's dash wild I do say!
lol - thank you mate
brilliant :)
cheers mate
Well, now we want a telescope
me too lol
Very cool. I wonder what the actual mathematical profile of the lens shape is. Is it actually parabolic? Or is like a catenary (which is very close to a parabolic curve but not quite - the same as a hanging chain or rope) or small section of a spherical curve.
It's a catenary, but it's close enough to burn some ants.
@@Zakardis thanks for answering that for me. :-)
I believe some observatory mirrors were produced by molten glass slowly hardening on a rotating platform . A rotat ijng container of liquid produces a parabola. It's a long time ago now to remember but then what about a meniscus? A meniscus is parabolic surely . Small though .
I would think it would be. spherical section - but I don't know - if you wanted control over the curve it might be an idea to blow mold it instead free air mold
Would epoxy work in place of water I wonder?
worth a try mate
This is amazing stuff! In theory one could mass manufacture these and sell a lens that weighs very little compared to its final weight once filled with water. And everyone (well almost) has water! Cheap lenses like this would be great for reducing solar cell costs by focusing sunlight onto smaller panels.
Not necessarily ... Some type of solar panel work also from dispersed light. To get max effect you'll have to employ a heliostatic type of tracker adding to the cost and not benefit from dispersed light
it will destroy cell faster
for sure mate
Um gênio
Try to make powerful laser I saw one fella made it cutting the glass;!
Ingenius
cheers mate
Fill it wit transparent epoxy resin and cure it maybe it will work as real Object and not spill water if you drop it
nice mate - cheers
I wonder if the lens is frozen what properties it may have
Do you have a video on making a fresnel lense?
something that would be interesting would be to see how adding say salt vs distilled water effects the refractive nature, since they use different materials layered up to effect different frequencies of light to avoid rainbow effects on projectors that work with 3 distinct frequencies and different materials effect each frequency of light differently :)
there is a fair bit of work you cold do on this I would have thought
Now the question is how do I use this to make my own prescription glasses?
Hmmm eye glasses that can be adjusted for focus on the go could put opticians out of business.
oh oh now I have to watch out for a gang of angry opticians lol
Nice mate
cheers mate
The shape is parabollic or spheric?
@@mikeguitar9769 but how can that be?
he is using pressure, which applies in all directions, unlike gravity
It looks spherical and that would be my guess as pressure is applied pretty much evenly across the surface
@@ThinkingandTinkering At first that was my guess but I am wondering if the rim introduces a contour condition that spreads to the whole definition of the surface.
Gotta find a mathematician...
Shine Sun onto Soalr Cells
yep
If you were to fill this with clear epoxy, you'd have a more permanent lens.
nice one mate cheers
How about using CO2 to lens sound?
Like a purpose built balloon filled with some appropriate gas maybe ?
never thought about it - until now! - lol - that's very clever mate - nice idea I will give it a go
@@michaelcorbidge7914 Actually just a party balloon filled with CO2 gas will do the job nicely, but different gases will give different 'focal lengths' I expect
@@DaveJSmith the wine cask bladders ....that's boxed wine bladders....were on my mind for their shape when inflated and pressure can be a little above atmospheric . Not sure about the pressure tolerant plastic PET bottles for carbonated beverages, not sure if slightly hard surface messes things .
@@DaveJSmith yeas, but the refractive index of most gases is 1.000xyz, glass is 1.5 to 1.71 so ... yeah ... actually the plastic film on top would be more refractive than the gases inside with 1.3 to 1.4 ...
may people see the value of this
I hope it is of interest that's for sure
@@ThinkingandTinkering you should have been my neighbour , not because i enjoy it more ( ofcourse )
but whatever you use for most of your experiments costs like peanuts here , hope we will meet some day
You know Antonie van Leeuwenhoek made the first microscopes with water lenses
I didn't - but I will be looking into it now lol - cheers
Anybody know how to make a fresnel lens?
hmmm - interesting
What happened to the telescope bro
200IQQQQQQQQQQQQ
Cunning.
cheers mate