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ISO Comparison Between A55 & A550
Topic Started: Sep 21 2010, 11:38 PM (1,554 Views)
tankm
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Always Newbie
All photos taken with tripod mounted, 2s timer, Multi-segment metering, Center Focus, Aperture Priority at f4, Direct JPEG, Noise Reduction set to "AUTO" for A55 and "Normal" for A550 and AWB.

Sorry for the misalignment, photo resize to 800 x 600 and combine diagonally with A55 at Top-Left and A550 at Bottom-Right.

Some observation in this test
- The metering selected the same shutter speed for both. Looks like SONY has compensated for the light lost in A55. The actual ISO is most likely higher than the reported ISO in A55. Will be interesting to compare the A55 with A580 when it is released.
- AWB has changed slightly, warmer on the A55
- Looking at the dark area, the A55 exposure seems slightly brighter than A550
- Looking at the ISO noise, it looks like SONY has taken a different approach in A55. There is less chromatic noise in A55, however the A550 noise looks fine grain.
- CA problem in A550 seems to be gone in A55. Need to test this more to reconfirm.

ISO100 (A55 Only)
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ISO200
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ISO400
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ISO800
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ISO1600
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ISO3200
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ISO6400
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ISO12800
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100% crop with A55 on top. The A55 object looks bigger because of the higher pixels count.

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Willis
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Very interesting comparison.....based on your images presented I have to say that the A550 still perform better.
By observation, the A55 seems to have employed a larger amount of noise reduction in comparison. The noise pattern is A550 still seem to be cleaner and tighter or at least more usable.
The color wise I think A550 is more neutral while the A55 shows a tint of warmness....WB. Exposure seem different by half a stop with A55 being brighter.
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les40sail
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thanks for doing this comparison. :thumbsup1: i still have doubts on the SLT loss of light.

still if no mirror slap vibration, can shoot at lower speeds in the dark without worry of vibrations can help.

ca control can be detected in your pics? paiseh dont know how you see it.

a550 ca is terrible against strong backlight. if a55 ca is removed than this is good cam for shooting birds. i shoot at iso1600 often enough and if the bird is close...no problem. if have to crop significantly than pic is poor.
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tankm
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Willis
Sep 22 2010, 12:49 AM
Very interesting comparison.....based on your images presented I have to say that the A550 still perform better.
By observation, the A55 seems to have employed a larger amount of noise reduction in comparison. The noise pattern is A550 still seem to be cleaner and tighter or at least more usable.
The color wise I think A550 is more neutral while the A55 shows a tint of warmness....WB. Exposure seem different by half a stop with A55 being brighter.
Was wondering why SONY did not continue with the fine grain noise reduction approach in this cam. Can be due to the "AUTO" setting too. Have not seen how raw processing will turn out yet.
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tankm
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les40sail
Sep 22 2010, 08:28 AM
thanks for doing this comparison. :thumbsup1: i still have doubts on the SLT loss of light.

still if no mirror slap vibration, can shoot at lower speeds in the dark without worry of vibrations can help.

ca control can be detected in your pics? paiseh dont know how you see it.

a550 ca is terrible against strong backlight. if a55 ca is removed than this is good cam for shooting birds. i shoot at iso1600 often enough and if the bird is close...no problem. if have to crop significantly than pic is poor.
Can take a look at the 100% crop near Minnie eyelash, there is a slight hint of CA there on the A550 photo. More apparent in high ISO.

I have simulated a high contrast condition and the A55 sensor does not have very little CA compare to A550 very obvious CA. Will post pictures when I have the time.

For you my guess the camera to look forward to will be the A580 (with similar sensor) or the A7xx (similar or better sensor). I have gave up on waiting for A7xx, till now still no firm date when it's going to be available.
Edited by tankm, Sep 22 2010, 11:28 PM.
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tankm
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Extreme CA Comparison 100% Crop. The sensor in A55 does look better in controlling the CA. Strange thing is the amount of CA it reduces vertically and horizontally is different.

Shot is from a metal cup with a strong LED torch shining onto it with dark background.

Posted Image
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les40sail
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tankm
Sep 22 2010, 06:09 PM
les40sail
Sep 22 2010, 08:28 AM
thanks for doing this comparison. :thumbsup1: i still have doubts on the SLT loss of light.

still if no mirror slap vibration, can shoot at lower speeds in the dark without worry of vibrations can help.

ca control can be detected in your pics? paiseh dont know how you see it.

a550 ca is terrible against strong backlight. if a55 ca is removed than this is good cam for shooting birds. i shoot at iso1600 often enough and if the bird is close...no problem. if have to crop significantly than pic is poor.
Can take a look at the 100% crop near Minnie eyelash, there is a slight hint of CA there on the A550 photo. More apparent in high ISO.

I have simulated a high contrast condition and the A55 sensor does not have very little CA compare to A550 very obvious CA. Will post pictures when I have the time.

For you my guess the camera to look forward to will be the A580 (with similar sensor) or the A7xx (similar or better sensor). I have gave up on waiting for A7xx, till now still no firm date when it's going to be available.
actually a580 spec quite good with new sensor. if no a7xx might go for small upgrade from a550.

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les40sail
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tankm
Sep 24 2010, 12:06 PM
Extreme CA Comparison 100% Crop. The sensor in A55 does look better in controlling the CA. Strange thing is the amount of CA it reduces vertically and horizontally is different.

Shot is from a metal cup with a strong LED torch shining onto it with dark background.

Posted Image
looks like quite an improvement from your pics esp vertically!
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