Optics Tutorial - 10 - Achromatic Doublets

One of my favorite subjects! Creating an achromatic doublet! I love color correcting refractive optical systems... call me a nerd:)
If you want to skip the history portion skip from 2:30 to 6:50. In fact if you want to skip right to the equations go to 6:50.
A few things I forgot to mention in this video blog:
*Axial color is also called "Transverse chromatic aberration", "Longitudinal chromatic aberration", the former is a measure on of light deviation on the image plane, the later is measured along the optical axis.
*Greivenkamps book "Field Guide to Geometric Optics" was a resource... and it is a great, low cost little book.
*Ramsden is famous for his eyepiece which is two plano convex lenses with the plano sides facing each other... wiki pedia and optipedia are great references.
*I really glossed over the Seidel theory. I'll be covering that later.
Homework can be found here:
www.opticsrealm.com/tutorials-...

[@Twinson1]

There is a sign error in one of the equations. At around 8.08 there is an Achromat equations table. The lower right equation should be multiplied by a negative one. It should read R2 = F_total * (V1-V2)/V2*(n2-1). He corrects this in another video, Zemax 10 - Designing an Acrhomat.

[@jagannathbhola6896]

Please let us know about triplets combination of lenses and apochromatic design

[@Tommo020788]

if the aim was to reduce Chromatic Aberration, would crown glass not reduce this because of its low dispersion properties? Or no?
Someone suggested that an Achromatic lens would be best to reduce Chromatic Aberration, but if this type of lens consists of taking a lens that has low dispersion, then putting a high dispersion one behind it, what difference would this produce?

[@saqibhussain7217]

Hello, i am working on assignment to get the sharp white spot with the help of lenses, i used the double convex lense of focal length 5mm and a tiny prism to bend that light. my problem is,white spot is sharp within center , but around the edges it is blur, circle is not sharp from edges. any solution to get distinct white bright spot of light through lenses.

[@SmeeUncleJoe]

Can anyone suggest a workbook I can work through to learn basic optics ?

[@kaaltsidaakah3571]

hello,
i'm a little out of my depth with this, but i have a question:
are there fundamental differences between an achromatic doublet that would be made for a telescope, be different than one developed for a stereoscope?
specifically i am looking for a 175mm objective (0.5) for a stereozoom.
i am looking at a 180mm achromat for a telescope..

[@opticsrealm]

Great question!!!! There are few items to keep in mind with these applications. First what has been presented here has only considered on axis beams. Second both applications: stereoscope and a telescope, one must include a field of view (FoV). Third if considering a FoV one must consider where the aperture stop is located (see Zemax tutorial 12). Fourth the design processes presented so far do NOT discuss monochromatic aberrations. For on axis one needs to be concerned with spherical, and for off axis one should worry about coma and astigmatism. As of yet, I have not podcast on these monochromatic aberrations. If the stereoscope and the telescope operate with other optics, the FoV, stops, aberrations all have to be balanced and controlled to one another.

[@MrGwaai]

opticsrealm
i'm still not sure i understand.. but i fixed a rather randum dublet in my leica, and its working fine... besides not being able to find an optical tube theth the right thread pattern ..
thanks

[@opticsrealm]

MrGwaai Awesome. I tend to be a purest with respect to constructing and modifying optical systems. I've seen many cases where people have empirically found solutions that are "good enough". In my day job I'm held to a very high standard of optical performance: when I interface with non optics people who are passionate about an optics application , I tend to "over think":)

[@LittleLotte5]

Hello! Can you please tell me how to calculate thickness and diameter of an achromat doublet? Thanks a lot!

[@opticsrealm]

The easy "way" to add thickness is to use Zemax... and the videos "Zemax 10" and "Zemax 10A" talk about doing that.

[@opticsrealm]

I have some long equations that show how lens thickness affects dispersion... It is long nasty and not well documented. It is also a function of many other variables... such as shape factor... When you discuss shape factor one must consider spherical aberration, which this channel has not yet discussed.

[@LittleLotte5]

opticsrealm
Thank you!!

[@ophthojooeileyecirclehisha4917]

thank you so much

[@omarpasha2968]

I'm just doing an overview!

[@brendawcardoso9338]

I need to see this, but there's private

[@0RbIt1000]

came for physics got taught history

[@shhedayati3972]

امید روزی این ویدوها را به فارسی ببینم

[@itzravezz8443]

Grüße, an alle die wegen Farnleitner Referat machen müssen.