Which Focus Lens?

[Dean357]

Hi everyone.

I have one of the K40 chinese lasers and am looking to buy some new mirrors and a focus lens as the ones that came with it are very poor quality, as can be expected, lol.

I am a bit confused as to which focus lens to purchase between these two:

High Quality lens - http://www.lightobject.com/High-quality ... -P670.aspx

Improved Lens - http://www.lightobject.com/Improved-18m ... -P206.aspx

I'm assuming the more expensive one is the better quality one? But just want to double check first. The cost is not an issue, I just want the best lens of the two, I am only cutting 3mm and 4mm acrylic.

Thanks for the help.
Dean.

[Azirithdorr]

My limited experience using the two types of lenses suggests the HQ's do actually add a bit to preformance when everything is up and running correctly.