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If you are just wanting to post the pics to the computer, not print them, you could take the pic you wanted the close up of, or take one as close as your camera can. Then crop extensively to only be what you wanted in the close up, if your original pic is clear enough (focus wise) and your pic is big enough (pixel wise) the enlargement should be good enough for the screen, but you wouldn't be able to make a print of it.
If you are just wanting to post the pics to the computer, not print them, you could take the pic you wanted the close up of, or take one as close as your camera can. Then crop extensively to only be what you wanted in the close up, if your original pic is clear enough (focus wise) and your pic is big enough (pixel wise) the enlargement should be good enough for the screen, but you wouldn't be able to make a print of it.