Hi tirohunta,maybe a 19mm lens for thermal would suit you.Wide fov inside 100yds =15 to 19 + degress.And they match yr wallet better,dollars always the factor.Get one that runs off a small power pack.Not to big in yr hand and easy to slide in a side pocket of yr jacket when taking a shot.Try to get a shop to loan you one,do some deal.Dont always go for the cheapis,few more hunred dollars could find a good thermal for you.
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