Sony Alpha SLT-A55 Samples
Sony Alpha SLT-A55 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 |
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Sony SLT-A55 Highlights
Sensor-Size: 24 x 16mm
Actual size when viewed at 100 DPI
16 Megapixels Mirrorless | ISO 100-25600 |
Sony A Mount 1.5X FLM | Shutter 1/4000-30s |
2-Axis Built-in Stabilization | Full 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 sensor | Spot-Metering |
2 Axis Digital Level | Hot-Shoe |
Built-in Dust Reduction | Stereo audio input |
10 FPS Drive, 35 Images | Lithium-Ion Battery |
1920x1080 @ 30 FPS Video Recording | Secure Digital Extended Capacity, Memory Stick Duo |
3" LCD 920K Pixels |
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