Send the following on WhatsApp
Continue to ChatUsing an autocollimator to align 4f systems https://focalplane.biologists.com/2022/06/29/using-an-autocollimator-to-align-4f-systems/
Using an autocollimator to align 4f systems https://focalplane.biologists.com/2022/06/29/using-an-autocollimator-to-align-4f-systems/