10 Best What Is The Triplet Lenses To Buy? of 2022

Table of Content

• Loupe 10x Oval Hasting Triplet 18mm Black Quality Metallic, Focal 1" Clarity
• Designing a Cooke Triplet
• Is it possible to build a triplet apochromatic refractor?
• HTS 203A0 10x 21mm Chrome Triplet Jeweler's Loupe with Leather Case
• Download Free Lighting Book
• Starting Simple
• First Results: Optical Aberrations

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.

The way I figure it the average dot size for a high resolution CRT monitor is around .24 mm. This dot consists of three color pixels so lets say that for a lens system to accurately focus on these small objects it must be able to focus each subpixel. So we need a lens that can focus a spot size of .08 mm to be able to accurately focus the image.

Loupe 10x Oval Hasting Triplet 18mm Black Quality Metallic, Focal 1" Clarity

Since you are stuck with that distance, you have to work backwards to see how you can get the arc image focussed right at the projection lens. You can move the field fresnel to before or after the LCD. You can also play with the lamp-to-condensor-fresnel distance a bit to move the focal point of the field fresnel.

I'm not going to anything with them and they would only get lost or broken in due course.Peter Drew May 19, 2017 I nearly did as well, it was a steal at the price. Create a new assembly and add the three lenses in the order lens1, lens2 and lens3. Align the front plane of lens2 7.89mm from the back plane of lens1.

Designing a Cooke Triplet

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.

A good brand will always produce quality products, so a product with an established name should be good enough for your needs. Please enable JavaScript to view the comments powered by Disqus. Mark Parrish is a consummate designer and a prolific producer of DIY astronomy products. You may eventually want to get a small altaz or equatorial telescope mount for your telescope. The easiest method is to make a simple wooden stand for the lens and another with a sheet of white card fixed vertically to it. The first stage of the build requires you to measure the focal length of your lens.

Is it possible to build a triplet apochromatic refractor?

Nikon, Canon, Leica, Pentax, Sigma, Tokina, and a host of other lens makers are all striving to bring you the sharpest lenses with all optical aberrations reduced to the minimum. Because with lenses, as with life, sometimes it’s the imperfections that make things interesting. The back of the lens is treated in the same way except the sign of the radius is reversed. This means that a convex shape is a negative radius and a concave shape is a positive radius.

I think you need to stick to the low end of that range, since you need a field fresnel that is a bit longer than the LCD to lens distance. Lumenlab has 790 mm fl fresnels that would work with a lens near the low end, in a split fresnel design. Due to the constraints of the room I'm building for, my projector needs to be around 16 feet away from the screen.

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Size for size and similar focal ratios the Fraunhofer is a better design. It is slightly more achromatic and field coverage is better if AP is a consideration. The Littrow is "easier" to make, needs little specialist equipment for testing and is less sensitive to cell mounting issues. I've used a number of uncoated Littrow objectives and can't recall ghosting issues, modern coatings, if applied should overcome any. The size and focal lengths that we are dealing with with this lens takes it outside of making it with common things like eyeglass blanks or even off the shelf lenses. I don't know much about lens design or requirements, but when reading this thread one source came to mind for making custom lenses of various strengths cheaply, eyeglasses.

The three lenses can be glued together, such as the Steinheil triplet or the Hastings triple. Or the Triplet Lenses can be designed to have three spaced-apart glass. The three lenses may be cemented together, as in the Steinheil triplet or the Hastings triplet. Or a triplet may be designed with three spaced glasses, as in the Cooke triplet. It is always longer than the projection lens focal length.

We are not yet diffraction limited and there are certainly more steps one can take but we stop here. Any significant improvement would most likely involve lens splitting, glass choice, and/or aspheres. As one can see in the design, using only spherical elements with relative common glass choice, it performs well on- and off-axis.

A small home made kiln will be made that can heat small glass blanks up to a moldable temperature. With e-drawing you can manipulate the model in real 3D space but you can not edit it. You can however, mark up notes and questions on the model and perhaps save the screen as a jpeg.

Comfort– Comfort is the other primary factor we took into consideration when evaluating triplet lenses. After all, the more comfortable a triplet lenses is, the less likely you will dislike it. To overcome this, modern telescopes have ‘doublet’ lenses that use two different glass elements to bring most of the colours to focus at the same point.

Starting Simple

Please look at the anamorphic thread to see how some of those lenses were actually made in the past. Here is a picture of a computer optimized wide angle cooke triplet which should work with LCD of 17 inch wide screen format. It has 450 mm FL and 40 degrees total field of vision. I will post design information and the lens can be scaled down for use with 15 inch LCD and lower FL. Find an optician who will sell you two 75 mm diameter +0.75 Diopter lenses.

There are so many variables that triplet design was really an art form until computers became available. Early designers had to spend weeks doing the math to model how the lens would perform, changing each parameter a tiny bit each time through the calculations to see if it helped or hurt. Another approach is to use two tubes with slightly different diameters to build a sliding focuser. Cardboard mailing tubes or PVC pipes are possible sources for the sliding tubes. Sticky-back felt, from your local arts and crafts store, can be used to create a nice friction fit between the two tubes.