Here is a little info from Lincoln Electric
http://www.lincolnelectric.com/knowledge/a...ldinglenses.asp
I went with the Optrel Satellite OSE
http://www.optrel.com/
I have been using an auto-darkening helmet for about 9 years, but it is so old, I don't know what brand, but think it came from Northern Tool.
I went with the Optrel due to the fact it is solar powered with no batteries, it can be adjusted closer or further from your face, the optical clarity is 100% better than what I had, you can go from a grinding setting to plasma cutting to welding, the controls are on the outside and allow you to changed settings without going inside the helmet, etc. I tried one and really liked it, so I chose it. Meant to add you can buy magnifiers for it also for 1.5 or 2.5, etc., for about $10. If you buy a cheaper helmet look for the ANSI Z87.1 certification.
Optrel vid
http://www.optrel.ch/video/h_satellite.asp
Optrel features:
* Grinding - With a push of a button the unit's shade 4 grinding mode is activated. A blinking LED light inside of the helmet indicates that the grinding mode is on and the ADF cartridge is deactivated, all with out removing your helmet. If you forget to reactivate the ADF it does it itself in ten minutes.
* Shade level control - Adjust this control knob to select the shade within settings of 5-9 or 9-13. Selections can be made according to the welding process making this one of the most versatile helmets on the market.
* Sensitivity control - Factory set at red dot for most procedures. Adjustable to meet different welding applications including micro plasma, plasma cutting, gas welding, and low amperage mig welding to name a few. Match the sensitivity level to your specific need.
* Adjustable Sensor Bar - Eliminate the effects of ambient light. Simply slide the sensor bar up and the angle of detection will open from 60 degrees to 120, which optimizes performance during low current and over the head welding. Keep it down and reduce the chances of a near by arc darkening your lens.
* Front Cover Lens - The multifunctional injection molded spherical cover lens not only reduces reflection thus providing better visibility and optics, but its foam gasket ensures the protection of the ADF filter by sealing out harmful dust, spatter and moisture particles. The lens is molded thicker to resist heat warping during high amp welding.
* Solar Cells - Optrel's proven solar technology ensures a continuous power supply while also eliminating the need for on/off switches and untimely/costly battery changes.
* Eye Protection - Several LCD's and special filters provide permanent Shade 14 protection from dangerous UV and IR radiation, even in the unlikely event of total filter failure.