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Crittergetter Micro 7.0 PIR focal distance

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Hey everyone. I'm just throwing together a quick build with a Crittergetter Micro 7.0 board and I was wanting to know what focal distance this PIR has. The instructions say it comes with 3/8" standoffs. But is that if it used with a snorkel type of fresnal mounted on the outside?

 

I don't have a snorkel type fresnal to mount on the outside of the case. I usually just glue the HPWA fresnal flat to the inside of the case. That always works for me that way.. In that case, would it still have a 3/8" focal distance, or possibly more to take into account the distance the lens would be away from the PIR if it were using a snorkel on the outside?

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