|
Our eyes are more sensitive to the green 520/532nm wavelengths than other laser wavelengths, like 445nm blue and 638nm red at the same power level.
So green 532nm is ideal for visibility but is also detrimental to night vision if the power is too high.
Legally and ideally you should be using a 5mW laser for astro and only for short periods of time so it won't affect your night vision to any large extent.
Using a blue or red laser at their legal levels of 5mW would not be as visible so green 532nm at 5mW is ideal for astro use as a pointer.
Always be aware not to shine at aircraft and DO NOT look directly at the laser, even at 5mW because eye damage is instant even at low levels.
Also be aware that the green 532nm lasers also emit high IR which is invisible but very dangerous.
Better quality laser pointers have an IR filter installed to stop harmful IR emission but the cheaper Chinese eBay lasers don't and they are very dangerous to your eyesight.
Green 520nm lasers do not emit IR so they are safer in this respect but are harder to find and more expensive.
RB
|