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A 20th of a degree ( roughly ) would be around 3 minutes of angle IINM, so if that's correct then it's not so bad, as it's starting at 1.7mm it would look good if it was a visible beam, but it's not a visible beam so if your looking to do work such as cutting then you will want to focus it down tighter.
I am going with adjustability and depending on your purpose you may want to as well, for setting cardboard on fire across the room it should do the trick, but there's a lot of cutting potential there, so I would go with an adjustable lens, otherwise it has limited use.
I am going with adjustability and depending on your purpose you may want to as well, for setting cardboard on fire across the room it should do the trick, but there's a lot of cutting potential there, so I would go with an adjustable lens, otherwise it has limited use.
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