Autobrite vs Optimus
I believe the following shots indicate an approx 2 stop Autobrite advantage: Optimus with ExposureTime - 1/207.7 seconds & FNumber - 5.60
FF3 with Autobrite:
Optimus with ExposureTime - 1/234.5 seconds & FNumber - 2.80
There is a two stop difference in aperture numbers (2.8 4 5.6).
Of course the above is rather subjective without a detailed analysis of raw data values. One could feel that the last Optimus provides just as much detail in the bulb and more in the dark background - but if you look closely at the base of the bulb in all three you should see a ringed shadow on the first two that is blown near 2 oclock on the last. The last also appears to have a larger buzz halo.
I believe the following shots indicate an approx 2 stop Autobrite advantage: Optimus with ExposureTime - 1/207.7 seconds & FNumber - 5.60
FF3 with Autobrite:
Optimus with ExposureTime - 1/234.5 seconds & FNumber - 2.80
There is a two stop difference in aperture numbers (2.8 4 5.6).
Of course the above is rather subjective without a detailed analysis of raw data values. One could feel that the last Optimus provides just as much detail in the bulb and more in the dark background - but if you look closely at the base of the bulb in all three you should see a ringed shadow on the first two that is blown near 2 oclock on the last. The last also appears to have a larger buzz halo.