Altair Wave Series optical test report:
Your Altair 115mm ED Triplet APO optics are repeatedly tested and re-figured during the final stages of production, until signed off by the optician in charge of the production batch. The best quality Ohara SFPL-51 glass is used in the ED element, which is fully annealed and cooled to relieve internal stresses. Each lens cell has a serial number engraved on the front ring. Working closely with our optical technicians, we have introduced a unique multi-tier quality assurance process for all Wave Series lenses, to ensure the highest quality and lowest chromatic aberration. These lenses are modified, and are far superior to the "normal" production quality lenses offered by most manufacturers. Star tests speak for themselves, and colour correction is superb, as can be seen from the various observing reports and images taken with Wave Series refractors. Blue stars show negligible bloat in long exposure images. During the production process, a laser interferometer image is acquired in 532nm green light, and imported into fringe analysis software to create an optical test report summary. This test report is included with your telescope (see example image attached in the thumbnails below the main product image) . Each image is a "snapshot in time" of the lens on the test bench. Vibration, air currents and other environmental factors can influence the image, and the outcome of the report slightly, though these factors are minimised during testing. Providing a test report is a useful way for us to assure that our our production quality is consistent from batch-to-batch. A paper report printout is included with your telescope, which corresponds to the serial number visible on the lens (an example report is shown in the thumbnail images below the main product image, with the serial number deleted) .