Sunday, February 27, 2011

How fast is the HDMI signal switching?

Quite a few people have asked us on how long is the blankout when HDMI signal changes when toggling between rec and preview...

Framebuffer disabled with color bars enabled to show the actual HDMI switching delay when used with a Canon 5D MKII and T2i/550D. If the framebuffer is enabled it looks quite seamless but it's kind of fooling the operator for some 5-15 frames. Anyhow when compared to any other device this is quite fast as the blankout on the only other HDMI viewfinder we can compare to is about 90 frames. And the other one claims just under 60 frames (two seconds).

Our solution works faster on Nikon DSLRs as Canon has some funky-i-frames (you can see 5 of these in the video) before the signal itself stabilizes. So it's camera specfic and Canon DSLRs with 480P rec output are the worst. The cameras with normal HDMI output exhibit no lag at all.

The EVF overall startup time however is under 1000 milliseconds so we can't implement any cool startup animations, loading bars, logos etc ;)...

For the LCD screen brightness reference: This was filmed with ISO dialed way down not to overexposure the screen when compared to daylight.

Check out the better quality version from > here

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