The Deepest Astrophoto Ever Taken with Amateur Equipment?
This image shows the faintest magnitudes recorded in my image Centaurus A Extreme Deep Field - 120 Hours
The FITS file was astrometrically solved and magnitudes calibrated against a white star (USNO-B1.0 0470-0346877). Subsequent magnitude readings from Maxim using aperture photometry show plenty of stars below magnitude 25 with the faintest recorded at magnitude 25.45. Specifically magnitudes of 25.03, 25.12, 25.22, 25.42 and 25.45 were read from point sources just in a small area around RA 13 26 54 Dec. -42 50 45.
The results seem to confirm that this Extreme Deep Field image surpasses the previous record made by Ken Crawford and Johannes Schedler's 2007 image of quasar CFHQSJ1641+3755 (Mag 24.80), and also the 2011 deep image of quasar QSOJ1148+5251 by Christian Sasse.
Date: Taken over 43 nights in Feb-May 2013
Exposure: LRGB: 90h:10h:10h:10h, total 120 hours @ -28C
Telescope: 10" Serrurier Truss Newtonian f/5
Camera: QSI 683wsg with Lodestar guider
Filters: Astrodon LRGB E-Series Gen 2
Taken from my observatory in Auckland, New Zealand