Why do manufacturers blaze their gratings?
Blazed gratings are specifically made to respond to a small specific region of light. For amateur astronomy use this would be for observing star spectral in the visible region (as your eyes can’t see outside of the visible region). The blazing is generally for 550 nm which is the region our eyes are most sensitive to. The draw back here is that a blazed grating only passes a very small part of an objects spectrum. If all you are interested in doing is visual observation of spectrums then a blazed grating will give you a little more colored light but not very much more. Additionally, blazed gratings that are designed for visual work have gratings of around 200 l/mm. This type of grating produces a very short spectrum compared to much longer spectrums produced by more dense gratings, like the ones we manufacture. A typical blazed grating has an efficiency of around 60% at 550 nm (depending on the manufacturer), with a spectral width of 420 nm to 670 nm where the efficiency falls off rapi
