Hello,
Starting from the model IR Zoom Lens, 85-205mm found in Design Templates in Zemax Libraries, can you please show how to customize the model properly to have a desired EFL? I have a fixed BFL as a costraint and I have 3 number of fields from 3 to 25 degrees.
Thank you in advance, any help is appreciated
Onder.
Best answer by Sahil
View originalHi Onder,
Add the requirents for EFL in Merit Function editor, fix BFL and optimize the system.
If you don't have design experience it can be enough hard to make a good zoom system. It looks that it can be simpler to find a designer for this task.
+1
Hello Onder,
Thanks for posting in Myzemax forum!
There are two ways to customize your model with desired EFL conditions applied.
1st Case : So if you want to find EFL of lens after STOP , then you can find EFL by using solve type F#.
Then radius will automatically adjust for F# =10 .Then you can choose Quick Focus in order to get proper Thickness of lens with desired EFL
2nd Case : Another way to find EFL ,If your lens lies before STOP then make the parameter radius and thickness to variable.
In merit function editor ,select image quality and Boundary values . As boundary values is suggestions to zemax suppose what could be maximum thickness of lens should be if you have radius of curvature of -20 .
After selecting both optimation function and Boundary values.Please select Optimization operand EFFL in merit function editor and select the desired wave and update it . You will get the EFFL value
Please feel free if you have any question.
Regards
Sahil
+2
Hi!
You can also find a design base similar to what you want, and then scale it.
Then you can do the optimization from the scaled starting point.
-Thomas
Sahil and Thomas Thank you for your invaluable contributions, I will be trying these suggestions at first chance I get.
Thanks everyone for a great and brief description on the given topic.
I have one question related to the same topic. I have done a design, I have optimized my design for EFL and magnification but unfortunatly my BFL is not matching with respect to my requirement.
Can you please help me out that which operand should I use to get the required BFL without disturbing the other requirements?
Thanks
Ashok
Hi…
TTHI operand at last surface thickness would work fine to achieve desired BFL!
Thankyou.
I have tried this. Need to maintain TOTR as well.
Please check the below zemax fille want to optimize for 9 mm BFL.
Thanks
Ashok
Zemax file looks good.
I have tried with TTHI on 6th surface and initial merit function is acheived till 6 mm BFL. After 6 mm BFL conic of aspheric surfaces are going to very heigh value which cause manufacturaing diffucuilty!
Check if you can live with 6 mm focal length, otherwise optics configuration needs to be modify!
Thankyou.
Thank you for giving your time. It was really helpful my TOTR got got reduced but anyway I’ll manage that.
Thanks
Ashok
To your concern…
Thankyou.
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