Interpreting that initial "4" as 1/4 second = 0.25, then these numbers are exactly the sort of thing that I would anticipate for metering continuous illumination. At a fixed f-number of f/25, 1 second at ISO 250 is equivalent to 0.5 seconds at ISO 500, and so on for all the other numbers.tevans9129 wrote:T------F----ISO
4-----25---1000
.3s---25---800
.4s---25---640
.5s---25---500
.6s---25---400
.8s---25---320
1s----25---250
None of this seems relevant to flash. To be honest, I'm wondering if the meter was even set to measure flash, when you reported that "Just checked with a 478DR-U and the readings are 1.3s0 at 1/16 and 1.6s3 at 1/128. So there is a difference in time."
I'm not sure that I'm reading this properly. Does this mean that you were able to reproduce this difference, even when capturing NEF and JPEG at the same time? If so, then I would still be interested to get access to those files, say via Dropbox or wesendit.com to support@zerenesystems.com ....decided to go back to the setup that I was using when I first noticed a difference from 1/128 to 1/16, which was….
D800e, Vivitar 2x TC, PB6 at full extension and Amscope 4x.
There was no discernable difference with the NEF files but there was in the JPEG files, not a full stop but definitely a difference in exposure. It seemed to be more pronounced when underexposed for some reason.
--Rik