Yesterday, I reported on camera vibration with the Zeiss 135mm f/2 APO Sonnar ZF.2 on a Nikon D800E in landscape orientation. See that post for details on the test setup. Today I show results with the camera in portrait orientation, flipped on its left side using the RRS L-bracket. The direction of the oscilloscope trace… [Read More]
Archives for 2014
D800E shutter & mirror slap testing with an oscilloscope
I set up this gear: Zeiss 135mm f/2 APO Sonnar ZF.2 on a Nikon D800E, RRS D800 L-bracket, Arca Swiss C1 Cube, RRS TVC-44 legs. Release with electrical contact closure from Cognisys rail controller. ISO 100, lens set halfway between f5/6 and f/8. The resultant images were processed in Lightroom with default settings except for… [Read More]
More oscilloscope a7R shutter slap testing
I’ve improved my “flying spot” shutter slap testing setup by adding a mirror. The technique involved mounting a camera on a tripod and photographing a distant oscilloscope set up with its vertical input grounded, and the horizontal time base set to a value that gave four to eight divisions of movement in the time that… [Read More]
A plea for leaf shutters
Iliah Borg’s comment to one of yesterday’s posts got me thinking. After saying that a firmware fix for the a7R’s shutter slap didn’t look likely, he made a passing remark: “Maybe this type of camera needs a leaf shutter.” The more I think about it, the better the idea sounds. Leaf shutters are quiet. Leaf… [Read More]
On vibration control, part 3
I ended yesterday’s post with this: In order to pick the right mass, spring stiffness, and damping to minimize camera movement in response to shutter movement, we have to know something about the forcing function created by the shutter movement, and also about the range of shutter speeds that are important. Today I’m going to… [Read More]
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