JayTee wrote: ↑Sun Dec 01, 2019 6:23 am
Bob,
What image acquisition program were you using to take the original (AV setting) flats?
JT
JT - I have been using BackyardEOS for flats as long as I have been collecting calibration frames. The camera does the work in that scenario, as the camera gets set to the AV position, and BYEOS just goes along for the ride. The BYEOS histogram looks good when the flats are taken, but measurement with
AP Lab tells a different story. I think BYEOS applies a temporary stretch to the displayed flat image for display purposes, and bases the histogram on the stretched image.
The latest flats were taken using
APT, and I controlled the exposure time manually, then measured the flats with the
AP Lab program. I would have done the same thing with BYEOS, but am looking to migrate to
APT, so went that route for the latest flats. The
APT histogram peaks all the way to the right, but
AP Lab reports the actual saturation level.
Bob
Hardware: Celestron C6-N w/ Advanced GTmount, Baader MK iii CC, Orion ST-80, Canon 60D (unmodded), Nikon D5300 (modded), Orion SSAG
Software: BYE, APT, PHD2, DSS, PhotoShop CC 2020, StarTools, Cartes du Ciel, AstroTortilla