Thursday, January 23, 2020

What is Triplet Lenses?

Lenses with antireflection coating are the best, but more expensive. Tell him or her it is for a projector lens, so you need uncut unmounted lenses. The pair of uncoated lenses should not cost anymore than their discount eyeglasses price.

Is there any difference between "zoom" lens and standered? Or is it just getting the correct focal lengths for each lens? Keep checking back i will post my results on the design that you specified. Im in the middle of midterms so it may be a week or more tell i post again. Creating two reference planes for the front and back of the lens will help with aligning them to create the triplet.

Is it possible to build a triplet apochromatic refractor?

Align the front plane of lens3 14.14mm from the back plane of lens2. Also this lens requires certain glass types to work properly and they would not be available in eyeglass lens blanks. Typically off the shelf lenes are only available in sizes up to 80 mm in diameter and that is smaller than the smallest lens in this system. Also, getting the exact prescriptions would not likely be possible with off the shelf lenses.

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Thread: how to build Cooke triplet ??

The lens cell on triplets is a vital element and quite complex to design and machine. So what your saying is lens with focal lengths of that distance always have a narrow feild of focus? You say that you dont know of a fresnal that will match that lens. Does the fresnel focal length need to be similiar to the focal length of the lens?

how to make triplet lens at home

You might be able to make it work by adjusting the lamp-to-condensor-fresnel distance to make the rays going to the field fresnel into a slightly diverging cone. This increases the distance from the field fresnel to the focussed image of the lamp arc. Depending on how we address the mechanics of the lens, focal lengths in the range of 60 – 200 mm are good candidates for DIY camera lenses. The general approach we will take is to draw a 2D profile of half of the lens on the XY plane and then create a revolve boss around the X axis. The X axis is the optical axis (i.e. the center of rotation for the lens).

Ade Advanced Optics 10x21TB-A Triplet Professional Loupes

Is the common generic design of triplet lens, like Rodenstock's Geronar, among others. I'm personally tempted to try a long focus Crown and flint achromat as my next project, I've seen a book on the subject and figure if I read it enough times I might just stand a chance! First off, I am in the process of making my own projector and trying to figure out what projection lens to use has brought me to this thread. So what this comes down to is that we need a lens system that can accurately focus an image as small as .08 mm or 80 microns.

how to make triplet lens at home

Rays of light from distant objects like the Moon pass through this and are bent or ‘refracted’ towards a point just inside the far end of the tube. Building your own telescope from simple components will help you understand how telescopes work. Our telescope design also makes a good science project for kids and young astronomers to complete at school or at home.

Running it will generate three part files, one for each lens. Based on our research, we have found these excellent products to be well worth the money and should be able to meet your needs. It's important to do your research before buying any new product.

One is to take the plans to an optical design firm and have them custom grind the lenses for you. The other is to make the lenses yourself by hand and then have them coated somewhere with the AR coating. I was hoping that someone out there had better access and funds to try to have one made. In the future I may try and redesign the lens for use with plastic lenses that can be hand made more easily but there is no reason that the lenses could not be made by hand. I may try and come up with a method that is doable in the future.

Could also be a bit of effort in getting the glass types required, although you have more flexibility then you would think as you do not specifically need FPL-51 or FPL-53. I'd look into using an old camera lens (eg. nikon f mount) in reverse. Posting something on this thread to get it out of the arcives for a time as someone has found possible builder of the lens. Rather than having custom lenses made you could even use piece together a lens system with used eyeglasses for nothing. There is also the possibility of having the lenses mounted in a water tight lens housing and using index matching liquids between the lenses. Done properly this can work as good or better than AR coatings on the lens.

Although functional, the preceding lens still doesn’t have a mechanism for adjustable focus. Let’s look at a few approaches to solve that problem. The first approach is to “recycle” the helical focuser from an old lens. Mounts and filter threads can be attached with Super Glue if necessary. This lens also includes an old iris diaphragm I found for $3 at a local surplus shop. Attaching rings from junk filters to both the focuser and the diaphragm will allow you to use them in an interchangeable system.

Make your own telescope: step-by-step

Then he could make you a fancy one with coated glass lenses. I think the plastic lens blanks are available up to 75 mm diameter, but the grinding machines used to make custom lenses may be able to handle 100 mm diameter. If he can make you extra-large lenses and get them anti-reflection coated, then you will have a very good duplet. I have a 700 mm fl telescope objective that I have tried with my projector.

how to make triplet lens at home

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