Vibration of the A7R shutter compared to D3 and NEX-7 using a seismometer

Started Dec 20, 2013 | Discussions thread
Petroglyph
Petroglyph Veteran Member • Posts: 6,085
Re: Vibration of the A7R shutter compared to D3 and NEX-7 using a seismometer

Rod McD wrote:

Hi,

Thanks for the test and your post. Whilst I agree that the results raise some questions, I think we need to be mindful of how significant this may or may not be.....

1) There are now a great many posts across the internet which show that the A7r delivers wonderfully sharp and detailed images.

2) Reviewers seem happy to compare the output of their tests favorably with a D800, the reigning DSLR king of resolution.

3) The test of hand-holding shows a lower frequency vibration or shake that is as big and sometimes bigger in amplitude than the shutter induced vibration of the camera mounted on the desk. To me, this really invites the question of whether the shutter shock is worth worrying about if you're a hand-holder.

From what I've read from other sources, and the ones linked to off of SAR, there may be a visible issue with longer lenses mounted via the lenses tripod collar on a tripod.  It seems the blur is across the short axis of the shot and begins at 100mm as visible in shots taken on a tripod using the tripod collar of the lens to mount the cam.  It may have something to do with the camera being off-axis and a fulcrum effect setting up a standing wave.  The testers suggested Sony could fix via firmware with a certain delay in one of the curtain traverses.  They also recommended adding (24 grams?) of mass below the camera mount socket.  They said it the camera was mounted via its own mount socket there was no visible vibration effect in the image.  They posted some of the effects and I clearly saw what they were talking about.  Don't think hand holding with a 55mm would see any effect or mounting via the tripod socket in the camera.

Cheers

I used to shoot medium and large format. I once tested my ability to hand-hold a medium format camera in good light by comparing side by side tripod and handheld shots of a test chart or bank notes. I thought I was pretty steady as a hand holder at "reasonable" shutter speeds, but that simple test soon provided an education....... A tripod is always better. I learned to reach for one at shutter speeds I previously though were good for hand-holding. It's a pity they're such a long gangly thing to carry all the time and so inconvenient in many contexts.

Cheers, Rod

 Petroglyph's gear list:Petroglyph's gear list
Sony a7R II Zeiss Batis 85mm F1.8 Rokinon 135mm F2.0 Samyang 20mm F1.8
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