Stock Lens Matching tool - Lens flip side

Userlevel 2

I suspect the Stock Lens Matching tool does not test the stock lenses twice (both direct and flipped). Can you confirm this?

I'm testing on a finite-conjugates system with two cemented doublets and it looks like the best result is not following the symmetry principle. Indeed, when I flip the first doublet I can reach far better results.

29 replies

Userlevel 3
Badge +1

@David.Nguyen Thank you so much!

I think the key point is, if there are two identical and symmetrical lenses set (or doublet, triboulet) in the system,
when replacing them, make sure that they are also identical and symmetrical lens combinations.

In this condition, you can only replace the left one to stock lens, and just copy and flip for the right one. 

Maybe it is not easy to examine the system has identical and symmetrical lenses set.

For example, try to find if there are two surface has the same parameters but only radius has opposite sign, then we can say they are identical and symmetrical.

Userlevel 3
Badge +1

Hi all

Starting from 23 R2.01, The Stock Lens Matching tool not only filters out suitable lenses based on the original criteria of EFL and EPD but also introduces support for two new options: Match Shape and Match Orientation.


Please see the KBA for the detail informaion.

Userlevel 7
Badge +2

Great news @Yihua Hsiao 


It looks promising. Do we know the shape factor difference range?

a shape factor difference within a certain range


Looking forward to trying this new feature.

Take care,


Userlevel 3
Badge +1

@David.Nguyen  The shape factor difference range is not a open information in the help file.But I think it’s just a range, looks like 10%, 20%.