Is there an SLR with no viewfinder blackout?

Started Jan 14, 2014 | Questions thread
Vikas Rana
Vikas Rana Contributing Member • Posts: 916
Re: Listen, don't just watch - 12FPS lasts for one second

Erik Magnuson wrote:

Vikas Rana wrote:

It may be an issue in earlier firmwares and fixed later but EVF only shows what sensor sees, watch this video and see how milliseconds are changing after every click:

Are you listening to the audio? It's only running at 12FPS between ~ 6:03 and 6:04 after which it slows to slightly more than ~1FPS. (DPR says 14 frames @ 12FPS before it slows to 1.5FPS, so that's about right.)

At 12FPS, there is an image every 83ms. The video is 60FPS which means each video frame is ~17ms. Do the numbers in that critical second at 12FPS jump by ~17 each time or ~83? (Actually, I see it jump by about 100ms between updates, e.g. 245->345). At 1.5FPS you actually see numbers overwriting each other mid-update. BTW, why does it start "blacking out" when running at the slower speed? (Hint: it's the time when the shutter & sensor are resetting after exposure. The sensor is blocked by the second curtain!)

You can see the difference between the "discrete" and the "continuous" update of the ms numbers in the 8FPS video more easily.

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Because of lens distortions SLT speed depends upon the lens used. I got 4fps on my A58 with kit lens but using Tamron I got 6fps, 3fps onwards.

The DPR says that the distortion does not effect the speed but in real test without distortion A77 perfoms 4fps after 12fps. SLT Reviews on DPR are either outdated or wrong.

A77 Test, 12fps in 1st sec, 4fps onwards

A58 Test, 6fps in 1st sec, 3fps onwards

 Vikas Rana's gear list:Vikas Rana's gear list
Sony SLT-A58 Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF) Sony DT 55-300mm F4.5-5.6 SAM Sony DT 18-55mm F3.5-5.6 SAM II Adobe Photoshop CS6
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