Quote:
Originally Posted by Merlin66
Another option is to double stack a couple of 5nm filters.
This will result in a bandwidth of 2.5nm and about a 50% reduction in transmission.
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Yes, true enough, but it should also be stated that there are a few assumptions here that may not be true...
for example, if the transmission is mesa shaped as opposed to Gaussian, then the above statement no longer holds.
Also... if we are talking about ultra narrow band interference filters, the discussion becomes pointless without
including a caveat with respect to bandwidth shift and angle of incidence... vis-a-vis - focal ratio
~2c