From an older thread I came across digging here and there in the
  huge pile of diluted info that pdml turned into...

Alan wrote:
AC> I have never been sure on this matter. My opinion is, if the spot meter 
AC> sensor is below the mirror, the split image has no effect to the spot meter. 
AC> If it is near the eyepiece, it won't be accurate. Anyone knows?

  Except for the LX and some Spotmatics, all meters are located in the
  pentaprism housing and measure from the focusing screen. Therefore,
  a split prism on the focusing screen covers the spot meter area
  and will affect its reading. What's worse, the reading error will be
  erratic due to prism refracting light at precise angles instead of
  uniformly dispersing the light as a matte glass does.

gfen wrote:
g> No more spot meter if you do so. However, a ZX-5 (not the -5n) has no spot
g> meter, so perhaps a used ZX-5 might be the way to go..

  The ZX-5 does have spotmeter. Versus ZX-5N, it only lacks memory lock
  and exposure bracketing.

  Servus, Alin

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