Luna Pro SBC

What is the REAL sensitivity of the Luna Pro SBC? I do understand the scale goes down to -7 EV @ 100ISO, but I know the meter sensitivity falls off before it gets that low. My understanding is the Pentax LX has the most sensitive in camera meter. Down to something like -6 EV @ 100. What is the most sensitive hand held meter? Are any of them sensitive enough to use for astrophotography?

Thanks,
Chris Maness

The Luna SBC reads to -4 EV at ISO 100.

Thanks, that is about what I guessed it to be.

Is there a meter that can read all the way down to the sky-fog (starlight and background light) level of the clear night sky out in the dessert? According to the Ultimate Exposure Meter that would be EV -6 or maybe even -7

Chris