In an attempt to ameliorate the a7R portrait-orientation vibration blur in the preceding post, I made two modifications to my setup. I cinched the lens to the support with a cable tie (shown before the ends were cut): And I put a two-pound weight on the bottom of the camera: The result was an improvement… [Read More]
Archives for February 2014
Comparing Sony a7 and a7R sharpness, part 2
Ready for an unscientific experiment? Set up a sturdy tripod and head as if you were going to make a photograph, but don’t mount your camera on the head. Make sure there’s plenty of room around you. Make a fist. Holding your hand about a foot above the clamp, bring your hand down smartly, but… [Read More]
Comparing Sony a7 and a7R sharpness
We’ve seen that the a7R is affected by shutter shock. We’ve seen ways to ameliorate those effects. We’ve seen that the a7 is essentially free of shutter shock effects by virtue of its electronic first curtain shutter. What if we put all that together and consider the question, “At its worst shutter speed, is the… [Read More]
Sony a7, M240 with 135 APO-Sonnar
Does the anti-aliasing (AA, or A-squared) filter in the A7 cost much in sharpness? I thought I’d find out. I took the super-sharp Zeiss 135mm f/2 APO-Sonnar ZF.2 and took pictures of the ISO 12233 target using studio strobe lighting and both the Leica M240, which has no AA filter, and the a7, which does…. [Read More]
Max in-camera ISO for the Sony a7
ETTR is only a useful exposure strategy at base ISO for ISOless cameras like the a7. What’s the maximum ISO you should use on the a7? There are three ways that I know to find out. The first is to minimize read noise as referred to the input of the pre-ADC amplifier. If you’re trying… [Read More]
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