It appears that the mirror is not locked up as long the filter is installed ?
With my Canon 6D the mirror keeps flipped up which makes the optical finder useless as long the filter is installed. No big deal for my UHC-S filter, but the Halpha filter does not show anything when in live view, even when using the ED110. In the latter case only very bright stars like Alpha Centaur or Capella show up faintly.
Is this not the case with this Nikon clip-in ?
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