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Yes, a built in barlow... don't attempt to unscrew the barlow from the body, you'll have elements all over the place! 20mm ER is true. I get great views thru my 9.5mm but it suffers from blackouts, which is not a real problem. Just a matter of eye placement. The smaller the FL in this series the better in this respect...I'm getting a 5mm shortly so I'll soon tell you.
Yes you can barlow them no sweat.
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