Question 37mm Threaded Lenses

Jan 24, 2020
I'm trying to find more information about 37mm threaded lenses.
Google can't seem to tell me much about this mounting style because it's confusing thread size for focal or film and just doesn't like 37mm being typed in.
I bought a smallrig case for my s10+ that includes 37mm threads for lenses but I can't seem to find lenses that will fit. I have used a converter plate that fits moment lenses and 17mm threaded lenses just fine, but would really like the full 37mm threaded lenses.
They show a lens mounted directly to the threading on the website so they must exist.
Any information from a camera guru would be MUCH appreciated about this type of lens. Is there another name for them? Are they readily available under different terminology?
Thank you.
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