Products > Thermal Imaging

Seek Compact macro lense questions.


I work in the semiconductor industry.  Picked up a Seek Compact Pro XR to see if it could be used for inspecting some components in packages "0201, 01005 components as well as amps and what not.

Set up some Thorlabs stuff and made a mount and i got it all set up and it worked great with a 2inch FL lens and a 4 inch FL lens.  So decided to see how far we can push this. 350um X 350um photodetectors. I can see the features and easily spot them. We have fiducials that are 50um X 50um and i can make those out...Very small but i can see them. Lens in it i can make out the shape.  We have carriers for them that are 750um X 750um and i can see those pretty good. 

I wanna get that image a little bigger.  Anyone have any experience pushing the limit? I don't need to gain much and im almost there. For what i wanna test i can use it how it is now but i would like to get a little big larger image. Anyone use any of the 1inch FL lens?

Not familiar with this particular camera, but in general you can increase your magnification by moving the lens further away from the sensor.
It might not be optimized for that magnification, but it thermal cameras have such low resolution that this is likely going to work.
I'm assuming the lens is removable since you mentioned that you tried this with two different focal length lenses.
You should be able to rig up a spacer which acts like a macro extension tube (if you want to look up the concept...)

For information only….

If you can locate another Compact Pro XR cheaply, remove its lens and mount it in reverse in front of your cameras lens. You then have a thermal microscope with a ‘pixel on target’ size of around 12um. The focus distance will be very small however so you will need to get close to the PCB/component. This excellent tip originally came from forum member Bill_W.
Finding a faulty Compact Pro XR camera, as a lens donor, would be ideal. Keep your eyes open on eBay.

Macro photographers use wall kinds of ‘tricks’ or obtain large clear images of small target objects so any of those techniques will apply to thermal imaging if you use the correct lens materials. I have not tried reversing a cameras lens assembly but I believe photographers do that for Macro work ? This is why I buy any decent thermal imaging lens assemblies that appear on eBay at reasonable prices. They offer much in terms of lens experimentation.


This guide to macro photography may be of interest  :-+

Reverse Lens macro photography….

Using simple single element close-up lenses for Macro work….

Of course all of the above detail is for visible light photography, but the principles apply to thermal domain imaging as well. You just have to use the appropriate lenses and consider thermal camera lens focal lengths etc.


I have not tried stacking close-up lenses on a thermal camera to increase macro magnification. Such is possible on visible light cameras so it may be worth some experimentation. ZnSe has decent transmission figures so you should not lose too much sensitivity. Be warned that simple CO2 laser focus lenses do have a 10.6um AR coating that favours that wavelength so the transmission varies significantly over the full LWIR spectrum.

In general, I would use a Meniscus lens in preference to Bi-Convex or Plano-Convex.



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