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Sony Alpha SLT-A55 Multi-Frame ISO

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.

Multi-Frame ISO

The Sony Alpha SLT-A55 features Multi-Frame ISO settings from 100 all the way to 25600. Multi-Frame ISO takes advantage of fast capture speeds to snap multiple frames which are blended to produce an image with lower noise. The exposure time is increased accordingly, up to 5 times. This obviously only works in JPEG mode and is designed to capture images of relatively still subjects in low-light when a tripod is not available.

Here we took pictures of a static scene at each Multi-Frame and regular ISO sensitivity. For consistency, a tripod was used although the self-timer cannot me used in Multi-Frame mode. Naturally, when I tripod is available, it would be better to simply reduce the ISO and take a longer exposure.

The results below tell the complete story. The ISO 100 shot, which normally required 2s of exposure, took 10 seconds to complete in Multi-Frame ISO and suffered from tripod shake since the self-timer cannot be used. This may also explain the slight softness at Multi-Frame ISO 200. Up to ISO 400, normal ISO shots look better than their Multi-Frame counterparts. ISO 800 is pretty much equivalent, with one side showing a hint of noise and the other a hint of softness. This is extremely similar to choosing different noise-reduction settings. Starting at ISO 1600, the Multi-Frame results show a lead of roughly one stop in terms of overall quality and slightly more improvment when looking at chrome noise alone.

Multi-Frame ISO Normal ISO

MF-ISO 100 - Tripod Shake!

ISO 100

MF-ISO 200

ISO 200

MF-ISO 400

ISO 400

MF-ISO 800

ISO 800

MF-ISO 1600

ISO 1600

MF-ISO 3200

ISO 3200

MF-ISO 6400

ISO 6400

MF-ISO 12800

ISO 12800

MF-ISO 25600
Sony Alpha SLT-A55
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By on 2011/01/30
3

Sony SLT-A55 Facts

Mirrorless digital camera
16 Megapixels Mirrorless (SLD)ISO 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
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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