Since my initial review of the Sony A7r, I have been asked by several readers to perform long exposure tests in low light, with 2 goals in mind :
While the first condition seemed very unlikely (my impression – at this early point – is that exposures from 1/30 to 1/50 are most affected by vibrations) I set up the camera on a Feisol carbon fiber tripod and Arca Swiss monoball P0 for 30 seconds exposures.
The lens used is the mighty lighty FE T* Sonnar 2,8/35mm ZA reviewed previously with much exhilaration.
The first target was a book in a very dark room only lit by a small stove fire and totally unreadable at one meter. Note these 2 files are FULL SIZE (large !) so you can inspect the results for yourselves.
What I see is no significant difference at all, and absolutely no shake …
Noise ? What noise ?
Shake ? What shake ? In fact, Jim at The Last Word, performed more scientific tests and found the shutter vibration to be 5 times less than the mirror slap from the Nikon D800.
Note how shallow depth of field is in this configuration (close range, f/2.8, book slightly at an angle) only a top-left bottom-right diagonal showing full resolution. Also note the purple in the background bokeh is due to a purple lamp reflector, not chromatic aberration 😉
For this second test, I pushed exposure by 1.7 stops in camera then added +65 contrast and +40 whites in LightRoom. Both pictures shot at 3200 and displayed here at -2,2 stops for aesthetic reasons.
Below are 2 enlargements of the central region without the 2,2 stop darkening (as shot). But you need no enlargement to notice the effects of noise reduction :
Strong purple fringes appear around bright stars. They look more like sensor blooming than chromatic aberration to me but I have no certainty of this. At any rate, NR ges rid of them and might keep the background a tad cleaner (sorry about the so-so focus, it was dark 😉 )
Largely but not totally unrelated to theoriginal request, here is a crop of the top right corner of the frame to show how well coma is controlled in this lens’s design. And the answer is : exellently.
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# 391. Sony’s A7RII (formerly Leica it or not)
#287. The Susans’ day out.
#217. Should you buy a Pentax 645Z (implied: or a Sony A7R)?
#210. The Leica Macro-Elmarit-R 60/2.8, the soulful engineer
#191. Leica Summicron-R 50/2 : the perfect 50 for the Sony A7r ?
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