3 Keys to Quality Double Gaussian Lens Design
When it comes to lens system designs, especially the ones used in the photography industry there are various types but the most common one is the double Gaussian lens. From the time of its establishment, there have been various types of configurations that come in almost 90 various patents.
One of the main challenges you might face when operating an optical system is maintaining the quality of the lenses and having efficient functionality. Therefore, the following is an overview and the keys to a quality Gaussian lens that you should understand to improve its functionality and quality.
Overview Of the Gaussian Lens
In a dual gauss lens, there are two adjoining lenses with a positive meniscus lens and a negative meniscus lens on the object and image side respectively. The design of a double gauss lens consists of two positive meniscus lenses which are on the outside, and two negative meniscus lenses located on the positive meniscus. In other words, a simple Gaussian lens has two positive meniscus lenses which consist of a flint and a crown. But the double Gaussian lens has been modified in terms of configuration and flips the simple Gaussian lens. The flipping and the duplication are done in a way that the positive meniscus lens points toward the object while the negative points toward the image.
How To Improve the Quality of Double Gaussian Lens
- The Choice of The Glass
You should put a lot of focus on terms of knowledge when choosing glass for your optical elements. You should focus on the V difference since it has an impact on the way aberrations are corrected. For instance, in case the V difference is too great it will have an impact on the negative lens making it too weak, enabling you to correct the other aberrations.
- Focus On Power, Spherical and Petzval
In case you want to increase the quality of the double gaussian lens, find a solution for power which is the focal length at the same time correct the spherical and the Petzval aberration which is closely linked. When you want to correct the aberrations, you must change the thickness of the meniscus elements.
After that, you will need to correct the spacing between the elements of the gaussian. After minimizing the aberrations, you will need to adjust the curvature of the positive element as this will help you restore the initial focal length.
- Chromatic, Spherical, and Field of Curve
After completing the procedure in the second step, you are then required to correct the chromatic aberrations and the Petzval sum. Correcting chromatic aberrations is through changing the outer spaces and the powers that the positive elements always have and maintaining symmetry.
The best way to achieve this process is by strengthening the crown elements ins small increments of approximately 1.5% while reducing the outer spaces by 0.05mm. after obtaining the needed value for the mentioned aberrations then you can continue and correct the spherical aberration and the tangential field curvature. Correcting the spherical aberration and tangential field curvature is done by bending the elements symmetrically.
When you are working with a full design gaussian double lens in the industry, you will have to conduct many calculations to evaluate the ray diagrams. To effectively conduct the needed calculations in evaluation, you will have to follow the designed steps as described above.