Questions About Pentaprism

What Kind of view finder does my old Nikon D70 use, a pentaprism or pentamirror?

I was cleaning my old D70 yesterday since I had recently gotten back from vacation. I got a little mud on the front of my D70 caused my me almost slipping into a lake lol. The mud came off and all is well. However what I noticed though while cleaning the view finder is that with the battery removed from my D70 the view finder is blurry and dark. But if I hold the camera up to my eye and insert the battery the view finder brightens up and comes back into focus. I did this same test with my D7000 which I know has a Pentaprism. Once the battery was removed the view finder got dark and blurry. However once the battery was reinstalled the view finder brightened up and came into focus. However when I did the test with my D3100 the view finder remained bright and in focus with the battery removed. The D3100 has a Pentamirror. So anyways does this mean the D70 used a Pentaprism? I checked online. DP review said in the specs that the D70 used a Pentaprism but Nikon's USA site doesn't say wh
http://answers.yahoo.com/question/?qid=20130629193257AAiuek7

What kind of view finder does my Nikon D70 have, a Pentaprism or Pentamirror?

I was cleaning my old D70 yesterday since I had recently gotten back from vacation. I got a little mud on the front of my D70 caused my me almost slipping into a lake lol. The mud came off and all is well. However what I noticed though while cleaning the view finder is that with the battery removed from my D70 the view finder is blurry and dark. But if I hold the camera up to my eye and insert the battery the view finder brightens up and comes back into focus. I did this same test with my D7000 which I know has a Pentaprism. Once the battery was removed the view finder got dark and blurry. However once the battery was reinstalled the view finder brightened up and came into focus. However when I did the test with my D3100 the view finder remained bright and in focus with the battery removed. The D3100 has a Pentamirror. So anyways does this mean the D70 used a Pentaprism? I checked online. DP review said in the specs that the D70 used a Pentaprism but Nikon's USA site doesn't say wh
http://answers.yahoo.com/question/?qid=20130629193142AASNstx