The economically priced BigShot 3000 uses the same LCTF but captures the three primary colors in three flash exposures
, in less than 10 seconds, yielding a full 12-bit 48MB file.
The SB-24 also provides an infrared rangefinder for the two cameras in extremely low light levels and rear curtain shutter synchronization that puts the blurs on the right side of flash exposure
with slow shutter speeds.
Light power, along with flash exposure
time is used to calculate Light Energy: light power (lux) x flash exposure
time (secs) = Light Energy (lux.
In addition to enhanced weather sealing and image stabilization, the EF70-200mm f/4L IS USM lens incorporates a circular diaphragm to create more natural looking background blur, and distance information to aid autofocusing and automatic flash exposure
Then it hands off the automatic flash exposure
decision to the i-Flash system, which adjusts the power output accordingly.
Among the new features found on the EOS Digital Rebel XT camera are user selectable metering and AF modes, flash exposure
compensation control, improved E-TTL II evaluative flash metering and for the first time in this product category, custom function control.
With this setting, the camera takes a long exposure of the night scene (you may need a tripod) plus a flash exposure
It then selects the areas with a small difference to be weighted for flash exposure
When combined with a compatible Canon camera, E-TTL II utilizes subject distance and other information that automatically modifies flash power, resulting in accurate flash exposure
regardless of subject size, reflectance, or photographic composition.
D-TTL Flash Exposure
Metering System - Photographers can take advantage of a host of creative options, even on location, and get outstanding results with all Nikon-compatible speed lights.
In addition to the on-board flash, the PowerShot Pro1 is compatible with all EX-series Canon Speedlites and Macro Lites and permits flash exposure
compensation of up to +/- 2 stops.
The system compares the ambient light with the reflected pre-flash off the subject reported in all 17 metering zones and selects the areas with a small difference to be weighted for flash exposure