Recently, at the request of a friend from the thermal imaging forum made a universal holder for macro and body lenses under the FLIR E series. Holders macrolens for FLIR you can find several types of on the Internet. They are all United by the principle of fastening - due to friction. But it's not very reliable. When shaking the lens may fall out. They fight very easily, and the price is not small. And on this principle it is impossible to fix heavier multi-lens lenses. What I wanted to achieve:
1. Reliability of lens mounting.
2. Universality.
3. The opportunity to obtain low distortion of the image.
If you want a large magnification then the idea of using a single lens doesn't work very well. The photo shows image distortion if you use an f25mm selenide lens. Two lenses F38.1mm is better work there. Less distortion. The different lenses can be set in different sequences to get the required magnification in macro mode from 1x to 8x. More expensive germanium lenses with a maximum diameter of 28 mm will provide a low level of distortion (spherical and chromatic aberration and distortion of the "pillow" / "sheet"), a better signal / noise ratio. Cheaper lenses made of zinc selenide of small diameter will allow you to get a budget option with low cost optics, but are still used for simple works. Thus, the adapter provides maximum flexibility in the use of existing lenses, cheaper or more expensive.
Where do we need such holder and macro lens, for example, in the field of medicine - photo palm. Macro lenses For the use of electronics diagnostics-photo phone. Well, in addition to this, you can install a telephoto lens in such a holder.
The plastic part of the holder on a 3D printer was printed and then polished on a lathe. Holders lenses sharpened then polished and anodirovanie.
A short video about the device holder can be found here
https://youtu.be/UG-XuUb1GrU