Real-time operation It enables you to precisely capture the decisive moment by providing a release time lag of only 6 milliseconds (the world's shortest*) and by keeping the viewfinder image constantly visible. How is this possible? Through the use of a new hard-coated pellicle mirror with the unique characteristic of allowing light to pass through and reflecting it at the same time. And since the mirror mechanism is fixed in place, the camera is free from mirror movement shock and operating noise is much lower. The benefits of real-time operation are numerous for flash photography, too. You can confirm flash synchronization because the viewfinder image remains constantly visible. You can easily determine optimum release timing during second-curtain synchro flash photography. And you can also monitor the special effects of stroboscopic flash photography. Continuous shooting at 10 frames per second The EOS-1N RS incorporates a high-speed motor exclusive for film wind, giving you the capability of shooting continuous exposures at the rate of up to 10 frames per second in the RS mode. This remarkable speed was realized because there is no up and down mirror movement for each exposure. Moreover, mechanical, and even electronic manual focusing during continuous shooting is possible. *Among SLR cameras as of September 1994.