svandeschur-
With all due respect, please do not tell my customers what to ask for. I have built over 30 professional Laser systems being sold to clients all over the world. I have not had a single complaint, defect, warranty issue or *ANY* problems with a system of mine because of the absence of aperture glass.
As i tried to explain previously, the non-use of aperture glass is more for certification purposes rather than functionality purposes. It is a "technicality" concept. If a customer asks or requests a window (in which 2 have) Than I have no problem adding one and adjusting paperwork and safety as needed.
-Marc