Can somebody tell me the difference between this lens: http://www.lightobject.com/Improved-18mm-ZnSe-Focus-lens-F508mm-P206.aspx AND THIS ONE:

Can somebody tell me the difference between this lens:
http://www.lightobject.com/Improved-18mm-ZnSe-Focus-lens-F508mm-P206.aspx

AND THIS ONE:
http://www.lightobject.com/High-quality-18mm-ZnSe-Focus-lens-F508mm-P670.aspx

Just the quality I imagine. fwiw have the LSR-ZNSE1850HQ and I’m quite happy with it.

Max power and price .

But how much do you actually gain? My budget is tight this year, and i’m trying to justify the extra cost.

I am not sure you gain anything, it`s more about the lens solidity certification before shattering.
(the possible amount of energy going through)

So would u suggest I get the cheaper one for now?

yes I do, light object is just a reseller on that one (imported mention).
→ better HQ Znse 18 mm 50.8 focal
http://www.ebay.co.uk/itm/HQ-ZnSe-GaAs-Focus-Focal-Lens-Si-Mo-K9-Reflective-Mirrors-CO2-Laser-Engraving-/181596677092?var=&hash=item2a480163e4:m:meMO7Y-AHxPJ3mdppCpT1mw

I have this bookmarked - the k40 group members on fb recommended it.

http://www.ebay.com/itm/261623000116?_trksid=p2055119.m1438.l2649&var=560531468505&ssPageName=STRK%3AMEBIDX%3AIT

I have the 29 dollar one and it works great.

I’m probably gonna go with the $29 one. Thanks everyone for your help!

@Sean_Cherven ​…I would…the other is a waste of money…just my opinion.

I bought the HQ one. Must admit I see an improvement over the original 12mm lens that came with the machine. Can’t comment on the $29 one but like others stated you may see very little difference & if money is an issue go with the lower priced one.

That’s good to know, it might just make a big difference…I might just order one today so I can see what the difference really is…with the 29 dollar one I can cut 3/16 plywood at 6mA and a speed of 8mm/s.

@Scott_Thorne , is the $29 one a improvement over the stock lens?

pay attention to the lens diameter 12 or 18 mm ?

Yah ik, I’m gonna be getting the air assist head.

It is a big improvement over the stock lens…I couldn’t cut 1/8 plywood without burning it with the stock lens…get it you won’t regret it.