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Sony Alpha SLT-A55 Outdoor Crops

16 Megapixels16 MegapixelsElectronic View FinderElectronic View FinderHigh ISO: ISO 6400 or more is available at full-resolution.High ISO: ISO 6400 or more is available at full-resolution.Stabilization: Compensates for tiny involuntary movements of the camera.Stabilization: Compensates for tiny involuntary movements of the camera.Level: Measures camera tilt and helps to keep the horizon level.Level: Measures camera tilt and helps to keep the horizon level.Continuous DriveContinuous DriveFull 1080p HD Video: 1920 x 1080 resolution or more.Full 1080p HD Video: 1920 x 1080 resolution or more.Manual Controls: Both fully-manual (M) and semi-automatic modes (T and V).Manual Controls: Both fully-manual (M) and semi-automatic modes (T and V).Custom White-Balance: Specifies exactly what should be white to the camera.Custom White-Balance: Specifies exactly what should be white to the camera.Action Photography: Shutter speeds of 1/1500 or more.Action Photography: Shutter speeds of 1/1500 or more.Night Photography: Reaches shutter-speeds longer than 4 seconds.Night Photography: Reaches shutter-speeds longer than 4 seconds.Hotshoe: Allows external flash units to be attached.Hotshoe: Allows external flash units to be attached.Spot MeteringSpot MeteringDepth-Of-Field Preview: Improve perception of DOF before shooting.Depth-Of-Field Preview: Improve perception of DOF before shooting.Live-View: Lets DSLR cameras use the rear LCD as an EVF.Live-View: Lets DSLR cameras use the rear LCD as an EVF.Built-In GPSBuilt-In GPSAccepts Secure Digital Extended Capacity (SDXC), SDHC and SD memory.Accepts Secure Digital Extended Capacity (SDXC), SDHC and SD memory.Accepts Memory Stick Duo memory.Accepts Memory Stick Duo memory.Neocamera detailed reviewNeocamera detailed reviewDiscontinued: No longer produced by the manufacturer. May still be in stock or found used.Discontinued: No longer produced by the manufacturer. May still be in stock or found used.

Outdoor Crops

The Sony Alpha SLT-A55 is compared to the Pentax K-5
Pentax K-5
, below. This is a DSLR which probably shares the same 16 megapixels Sony CMOS sensor. All images below are 100% unmodified crops from their respective cameras. Both cameras were set on aperture-priority mode with fixed ISO. Both zoom lenses were set to 26mm in focal-length but this still resulted in a slight difference in magnification despite both cameras shooting from the exact same spot. As per our standard methodology, both cameras are configured to output the highest quality JPEG images they can.

Custom white-balance was used on both cameras. It was an extremely cloudy afternoon and the Sony reported an error on every attempt to set custom white-balance. However, it seems to have managed as it produced very similar results to the K-5 which did not report any errors. Since the Sony Alpha SLT-A55 features both standard and Multi-Frame ISO sensitivities, this comparison shows the Multi-Frame ISO when the mouse pointer is over a crop. A peculiar effect that can be noticed here is that at relatively low sensitivities, the Multi-Frame ISO capture causes images to become slightly more bluish. This difference disappears at ISO 1600 and above.

Sony Alpha SLT-A55 Pentax K-5

ISO 80

ISO 100

Multi-Frame ISO 100

ISO 100

ISO 200

Multi-Frame ISO 200

ISO 200

ISO 400

Multi-Frame ISO 400

ISO 400

ISO 800

Multi-Frame ISO 800

ISO 800

ISO 1600

Multi-Frame ISO 1600

ISO 1600

ISO 3200

Multi-Frame ISO 3200

ISO 3200

ISO 6400

Multi-Frame ISO 6400

ISO 6400

ISO 12800

Multi-Frame ISO 12800

ISO 12800

Multi-Frame ISO 25600

ISO 25600

There is evidence of stronger noise-reduction on the A55 than on the K-5 which hides noise at the expense of added softness. By comparison, the Pentax remains sharp for about 2 stops more than the A55 under these conditions. On the other hand, the K-5's images show a tad more noise due to weaker noise-reduction.


ISO 51200
Sony Alpha SLT-A55
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By on 2011/01/30
3

Sony SLT-A55 Facts

Mirrorless digital camera
16 Megapixels MirrorlessISO 100-25600
Sony A Mount
1.5X FLM

Sensor-Size: 24 x 16mm

APS-C Sensor

Actual size when viewed at 100 DPI

Shutter 1/4000-30s
2-Axis Built-in StabilizationFull manual controls, including Manual Focus
0.46" Built-in EVF 1.4 Megapixels (0.73X)Custom white-balance with 1 axis fine-tuning
Automatic Eye-Start sensorSpot-Metering
2 Axis Digital LevelHot-Shoe
Built-in Dust ReductionStereo audio input
10 FPS Drive, 35 ImagesLithium-Ion Battery
1920x1080 @ 30 FPS Video RecordingSecure Digital Extended Capacity
3" LCD 920K PixelsMemory Stick Duo
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