Panasonic GH3 review published

Started Apr 15, 2013 | Discussions thread
Anders W
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Re: Panasonic GH3 review
In reply to exdeejjjaaaa, Apr 16, 2013

exdeejjjaaaa wrote:

Anders W wrote:

exdeejjjaaaa wrote:

Anders W wrote:

exdeejjjaaaa wrote:

Alexis D wrote:

and the best IBIS around (stabilsing any lens that is mounted on it)

and shutter shock because of that

You got that wrong. Shutters cause shutter shock. Stabilization systems don't.

no, my friend... IBIS can't handle shutter shock caused by shutter... that's why GH3 does not have it... sensor is one mass w/ body.

If you'd remember earlier discussions between us about this matter, you'd know that there is little in the way of evidence to support this theory of yours.

Does the E-M5 IBIS cause shutter shock? Clearly not. The shutter causes it.\

yes of course - at no point I was stating that IBIS is the source of shock, but it is the reason why shutter shock effect is in place (because Olympus IBIS by design does not make sensor one mass w/ a body + body is light itself)

No. Shutter shock is well-known to cause blur even with cameras where the sensor is fixed to the body, e.g., the GH2

http://cameraergonomics.blogspot.com.au/2012/05/micro-four-thirds-shutter-shake.html

... IBIS can handle low freq hands movements, not shutter shock vibrations...

Correct, except that I am not sure that shutter shock takes the form of a vibration or that this vibration is the culprit. We might as well be talking about a single shock or impact.

why do you think Olympus included an antishock delay options in its firmware... there is no mirror... there is only shutter and Olympus has to do this because their IBIS was making the effect to pronounced at certain exposure durations

There is no mirror, no. But instead there is something else that SLRs don't have: A dual shutter cycle. The shutter has to close before it opens for exposure and the shock caused by closing it is perfectly analogous to shock caused by the mirror flap on an SLR.

In line with what amtberg said here

http://www.dpreview.com/forums/post/51298312

I think Oly included the antishock setting because, unlike Panasonic, they were smart enough to realize that the first phase of shutter action (shutter closing prior to exposure) might cause blur for exactly the same reason as the mirror flap on SLRs, and that it would be a good idea to give users a way to avoid that impact, just as SLR makers have with regard to the mirror flap.

As a nice bonus, the anti-shock setting additionally gives you time-lapse functionality.

Does the E-M5 IBIS significantly exacerbate the shock caused by the shutter? Not that I know. What evidence for that proposition would you point to?

the mere fact that Olympus was forced to include a special antishock delay in EM5 firmware for users to use is a profound acknowledgment from a manufacturer (and as you perfectly know they don't do this easily).

The mere fact that Olympus gave users the option of anti-shock delay tells me that, unlike Panasonic, they were smart enough to recognize the need for it.

Does the E-M5 IBIS counteract the shutter shock? Regrettably not.

true, that was the whole point - shutter shock exists because of IBIS... remove IBIS, make a body w/ a proper grip and weight and you have no such pronounced effects @ the same exposure times... that is the price you pay for IBIS

No that's not the whole point. As I pointed out above, we agree that IBIS does not successfully counteract the shutter shock. That, however, does not make the situation any worse than it would be on a body without IBIS.

What you are implicitly arguing all the time is something else, i.e., that IBIS exacerbates the shock and that the shock wouldn't cause any blur unless the body had IBIS.

So I ask again: What evidence can you point to in support of that particular hypothesis. And by evidence I mean systematic tests, not speculations about manufacturer doings or sayings. We know from prior discussions about sensor tech how treacherous that can be, don't we?

Unfortunately, this makes the E-M5 IBIS close to useless (in my personal experience) with certain lenses at certain shutter speeds.

true

But IBIS doesn't make things worse than they would otherwise have been

it does, exactly because sensor is not one mass w/ a body

See my question above.

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