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About different lens: laser beam spot, focal range.

Laser beam spot

Get the best focus for your laser using a mirror camera Canon 1100 or 70D.

How does the laser beam focusing works?!

Laser beam focusing - how does it work

Comparing a different lens: 2 types of 3 element lens (black), G2 lens (golden), G7 lens (golding with a bigger glass)

 

Test one – regular 3 element lens

Focal range: 63-67 mm from the aluminum housing to the surface
Laser beam spot size: 85×130 microns (uM) (highest laser power density)

Original images

 

Test two – regular 3 element lens (longer version)

Focal range: 63-67 mm from the aluminum housing to the surface
Laser beam spot size: 85×130 microns (uM) (highest laser power density)

About different lens: laser beam spot, focal range.
Good focus

Laser beam spot

 

Test three – G2 lens

Focal range: 32-33mm from the aluminum housing to the surface
Laser beam spot size: 65×130 microns (uM) (highest laser power density)

Original images

 

Test fourth- G7 lens

Focal range: 83-85 mm from the aluminum housing to the surface
Laser beam spot size: 85×130 microns (uM) (highest laser power density)

Original images

Interesting laser beam calculator

Focal range laser lens test. laser lenses tests (PDF). Testing lenses from different optical producers.

Improved laser beam quality

Laser beam spot improvement for 445 nm diode laser (success – new laser beam spot)

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