Install a 2.5” Lens: MIRA

Applies to: MIRA 5, MIRA 7 and MIRA 9

This guide shows how to install and focus a 2.5” focal lens in your MIRA. Use the 2.5” lens to engrave tall objects, such as a cup with handle tabs. It gives more distance between the laser head and the object.

What you need

• Latex or nitrile gloves
• Microfiber cloth
• Allen key set
• 2.5” (63.5 mm) lens
• Manual focus gauge (0.5 steps)

Install the lens

Work over something that will catch a dropped bolt or lens. A microfiber cloth works well and is safe to rest the lens on.

1. Use a 2.5 mm Allen key to remove the auto focus assembly and lens housing from the laser head. Drape the auto focus assembly out of the way.

   

2. Use a 1.5 mm Allen key to carefully loosen the bolts and washers that hold the 2” lens in the housing, and set them aside. Remove the old lens and keep it somewhere safe, where it will not get dirty or scratched.

   

3. Install the 2.5” lens convex (dome) side facing up, into the top of the housing. Retighten the tiny mounting bolts.

   

   To check the direction, look at your reflection. Viewed from the top down, your reflection should be right side up, like looking into a tiny mirror.

   

4. Reinstall the auto focus assembly and lens housing in the laser head. Make sure the housing sits flush before you fully tighten the mounting bolts.

   

Focus with the 2.5” lens

The auto focus is calibrated at the factory for the standard 2” lens. With a 2.5” lens you need to focus manually, to add another 0.5” of focal depth. That is about 20.5 mm on the manual focus gauge, instead of the usual 8.5 mm marked by the small engraved arrow.

Once the laser is focused, run a 5 point test. See 5 Point Test: MIRA.