Panasonic DMC LZ5 - Calibration Problem
I used LZ5 for a personal research project to measure spherical angles. When comparing now measurements (photos from observations) with the calibration (photo from a well-defined and well-aligned chequered pattern) I obtain a systematic relative difference. I am wondering whether this relative difference can be related to the difference how the photos from the observations and the one for the calibration were made.
All observation photos:
- Scene-mode: Landscape
- Picture size: 1M
- Maximal zoom, until mechanical stop
- Objects were always in at least several kilometres distance
- Same settings as for observation photos
- Chequered pattern in 12 meter distance
I presume that the systematic difference comes from the slightly different focus infinity vs. 12 meter. Is it possible to estimate the effect of the different focus on the measured angle, and if so, how? Or, where could I possibly obtain help for this problem?
Thanks in advance for your help.