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Hey, No one answered So, I be a month late for an answer to question you were asking here .
a 720nm been my sacrificial lens for years . I never actually take the 720nm off my pvs14 even on darkest nights hunting .
IF you are looking with healthy eyesight in Sunlight/daytime you use the 720nm frequency for full coverage of colors . But you need to change your thought process . Because your looking threw an NV device, it's Nighttime, No Colors, mono-Green color, projected image .
OK ( just my personal interpretation ) .
720nm is 1 of the many frequency your NV unit covers/picks-up on making your projected image you are viewing . BUT you really don't need it .
I think, it is he least needed frequency, and blocking 720nm out your NV Obj. really is an image asset than a liability .
Because the ' pros out-way the Cons.' ( blocking with a 720nm ) , it cools-off the harsh image bloom, when in open fields in a big full Moon , or other bright artificial light pollutants causing excess bloom that you get streaking in from outside area's you are working in . Lights like, Hwy. car lights, tail lights, distant Industrial or house/farm lights ..etc .
It also serves the role for a excellent sacrificial protection lens .
OK .. On the darkest night . wearing NOD, If you crank your manual gain up to Max on your pvs-14 .
If you take the 720nm filter off your Obj. in the darkest No Moon night conditions . You will see that your image will brighten ' just a tiny bit ' . But personally I Feel the tiny bit of frequency blockage is really so minimal that it does not hamper anything I am doing at all at night.
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edit add:
If you are one of the people using a pvs14 for weapons mount in front of a day scope . A 720nm will block out some of the ' illuminated options ' offered on daytime rifle scopes Reticle .
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