1507. To eliminate the concerns in #1506 (about the scene changing between exposures), why doesn’t TTG allow a longer time limit for combining exposures when there is no motion or change in the scene??

There are two reasons that that approach would be unrealistic:

1) It ignores the critical “philosophical” aspect of the time limit, described in #1 of #1506 (above).

All TTG-qualified photographs must have all 9 characteristics, not just 7 or 8 of them.

(That alone ruins any chances for the proposal described in question #1507.)

2) It opens the window very wide for abuse.

Even a cursory web search for focus-stacked or HDR photographs of purportedly “motionless” scenes quickly reveals that photographers are inclined to present various scenes as being completely “motionless” when the scene clearly is not.

This #2 phenomenon is similar to how photographers are inclined to dismiss as “minor” various manipulations that the viewer might consider “major” if they knew about them. More

As is made clear in #1505, there is never a need to combine exposures in order to meet the Trust Test.

• Photographers who feel compelled to combine exposures started more than one second apart — whether for reasons of focus stacking, of HDR, to fulfill their personal artistic vision, or any other purpose — are free to do so and not worry about TTG.

• But viewers who see the TTG label have particular expectations, including the reassurance that a TTG-qualified photograph was not made with exposures that started more than one second apart.