hahahh what a HILARIOUS prank . <| sep |> Roger Ver ? Must be very important for you . <| sep |> I don ' t think you ' ve seen forex charts this year EVERY currency has been volatile ! We ' re talking about international payments to Czech Republic here , so the actual currency doesn ' t make very much difference , bitcoin settles in a hour , which is far faster than PayPal , and it can ' t be blocked on a long weekend by a big company . That ' s the real reason . But holding btc instead of CZK isn ' t bad either , Prusa is probably going to have to convert to Euro , CNY or some other currency pretty soon after the sale in any case . Btc can make that easier and cheaper too . <| sep |> This is an old one of mine . I took it with a 60 mm nikkor macro lens , Nikon D 90 . Not sure of other specs .