SVBony
SVBony SV705C
The IMX585 is the current sensor of choice for planetary work, and this is an inexpensive way to own one. Roughly 90 percent quantum efficiency and 0.7 electrons of read noise at high gain, with a sensor large enough to double as an electronically assisted viewing camera.
85/ 100
Camera Type
PlanetaryDeep sky
Primarily a planetary and lunar camera, where fast readout and low noise matter more than sensor area. The 1/1.2 inch sensor is large enough that it also works for electronically assisted viewing, which is unusual in this class.
Type
One-shot colour
Cooling
None
Pixel Size
2.9µm
Read noise
0.7 to 6.5 e⁻
Resolution
8.3 MP · 3856×2180
Sensor
Sony IMX585 · 1/1.2 inch
From$294.99
Price tracked by PolarisNew to trackingTracking since Sep 2026
01What it's good atWhat it's best at — and the trade-offs.
Planetary imaging is a numbers game: you capture thousands of frames and keep the sharpest few percent, so 45 frames per second at full resolution is the…
01What it's good at
What it's best at — and the trade-offs.
Planetary imaging is a numbers game: you capture thousands of frames and keep the sharpest few percent, so 45 frames per second at full resolution is the…
Best at
✓Planetary imaging is a numbers game: you capture thousands of frames and keep the sharpest few percent, so 45 frames per second at full resolution is the specification that decides your final image.
✓Read noise down to 0.7 electrons at high gain lets you use very short exposures to freeze atmospheric turbulence without the noise floor swallowing the planet.
✓An 11.2 by 6.3 millimetre sensor is unusually large for a planetary camera, which makes lunar mosaics far less tedious and opens up electronically assisted viewing.
✓The ST4 port means it can serve as a guide camera when it is not imaging planets, which is genuine second duty rather than a specification sheet line.
Trade-offs
!No cooling, so long exposures accumulate thermal noise and this is not a deep-sky camera despite the sensitive sensor.
!12-bit conversion is right for planetary work and limiting for stretched deep-sky images.
!USB 3.0 bandwidth is the real ceiling on frame rate. Reaching the highest speeds means cropping the region of interest.
!Planetary imaging is demanding on seeing. On an average night the atmosphere, not the camera, sets your result.
02In plain EnglishThe numbers, in plain English.
Sony IMX585 · 8.3MP · 2.9µm · None
02In plain English
The numbers, in plain English.
Sony IMX585 · 8.3MP · 2.9µm · None
Frame rateFast
45 fps at 8.3 MP
This is the number that decides a planetary image. The atmosphere blurs your view continuously, so the technique is to record thousands of frames and keep only the sharpest few percent, when the air happened to be still. More frames per second means more lucky moments captured in the couple of minutes before the planet rotates visibly, and that directly sets how much detail survives stacking.
Read noiseVery low at gain
0.7 to 6.5 e⁻
Read noise is added every time a frame is read out, and a planetary camera reads out thousands of times per session. Dropping to 0.7 electrons at high gain is what makes millisecond exposures viable: you can freeze the atmosphere without the camera's own noise drowning a signal that brief. At low gain it rises to 6.5, which is the trade for greater well depth.
Sensor sizeLarge for planetary
11.2 × 6.3 mm
Most planetary cameras use a sensor a few millimetres across, because a planet is tiny and extra area is wasted. This one is considerably larger, which does nothing for Jupiter and a great deal for the Moon: a lunar mosaic that needs six panels on a small sensor needs two here. It is also what makes electronically assisted viewing of deep-sky objects practical with this camera.
Peak QEVery high
About 90%
Quantum efficiency is the share of arriving photons the sensor records. At around 90 percent the IMX585 is near the practical limit, and in planetary work that translates directly into shorter exposures. Shorter exposures freeze more atmospheric turbulence, so sensitivity here buys sharpness rather than merely brightness.
Bit depthRight for planetary
12-bit ADC
Twelve bits gives 4,096 brightness levels per frame, which sounds modest and is entirely correct for this job: stacking thousands of frames recovers far more depth than a single deeper frame would hold. The same specification is a real limitation if you try long-exposure deep-sky work, where a 14-bit camera visibly holds together better under a hard stretch.
CoolingNot needed here
None
Thermal noise accumulates over time, and a planetary exposure lasts milliseconds, so there is nothing for a cooler to suppress. Its absence is why this camera is small, light and powered from one USB cable. It is also the single specification that rules the camera out for the long exposures that deep-sky imaging requires.
03Typical targetsWhat it shines on.
Jupiter, Saturn, The Moon, Mars, Venus, The Orion Nebula (M42)
03Typical targets
What it shines on.
Jupiter, Saturn, The Moon, Mars, Venus, The Orion Nebula (M42)
04Build your imaging rigEverything you'd actually buy.
Capture · Steady it · Second duty
04Build your imaging rig
Everything you'd actually buy.
Capture · Steady it · Second duty
Capture
What forms the image
A Schmidt-Cassegrain or Maksutov
Planetary imaging wants focal length. At 1500 to 2000 mm the planet is large enough on the sensor to reward the frame rate.
A 2x or 3x Barlow
Ideal planetary sampling is around f/15 to f/20 with 2.9 micron pixels, which most telescopes reach only with a Barlow in the train.
Steady it
What limits the result
A solid mount
No tracking accuracy is needed for millisecond frames, but vibration during a two minute capture ruins the run.
Patience with the seeing
On most nights the atmosphere sets the ceiling. The same camera on a steady night produces a visibly different image.
Second duty
What else it can do
Guiding via the ST4 port
On nights when the planets are not up, this becomes a capable guide camera rather than sitting in a case.
05The Polaris ScoreHow it scores, and why.
85/100 · #2 of 5 planetary cameras
05The Polaris Score
How it scores, and why.
85/100 · #2 of 5 planetary cameras
85/ 100
SVBony SV705C
#2 of 5 planetary cameras
Judged as a planetary camera this is close to the top of what is available, because it carries the sensor the premium brands use at a substantially lower price. It gives up ground on software polish and long-exposure deep-sky work, neither of which is what a planetary camera is bought for.
Image quality86
Low-light sensitivity90
Ease of use86
Value90
Polaris weighs how well the camera does the job it was designed for — image quality, sensitivity, versatility and value — never list price or brand.
06Who it's forAn honest fit check.
Anyone with a Schmidt-Cassegrain or a Maksutov who wants to photograph Jupiter, Saturn and…
06Who it's for
An honest fit check.
Anyone with a Schmidt-Cassegrain or a Maksutov who wants to photograph Jupiter, Saturn and…
Buy it if you
✓Anyone with a Schmidt-Cassegrain or a Maksutov who wants to photograph Jupiter, Saturn and the Moon properly.
✓Lunar imagers, where the large sensor turns a six panel mosaic into a two panel one.
✓Observers interested in electronically assisted viewing, where a sensitive uncooled sensor and short stacked exposures show far more than the eye can.
✓Someone who wants one camera that can image planets and guide a mount on the nights it is not doing the first job.
Look elsewhere if you
!Long-exposure deep-sky imagers, who need cooling and 14-bit depth rather than speed. An uncooled 12-bit sensor will not stack cleanly over hours.
!Wide-field imagers, since 11.2 by 6.3 millimetres is small next to any dedicated deep-sky sensor.
!Anyone without a reasonably long focal length telescope, because planets at 500 mm are small regardless of the camera.
!Imagers who dislike processing, since planetary results come from stacking thousands of frames and sharpening, not from a single good exposure.
07The numbersFull specifications.
21 measured and stated values
07The numbers
Full specifications.
21 measured and stated values
Sensor
ModelSony IMX585
TypeCMOS · 1/1.2 inch back-illuminated
Megapixels8.3
Pixel Size2.9µm
Bit depth12-bit ADC
Noise & sensitivity
Read noise0.7 to 6.5 e⁻
Full well38,000 e⁻
Peak QE~90%
Cooling
CoolingNone
Connectivity & fit
InterfaceUSB 3.0 · 128 MB buffer · ST4 guide port
More
adapters1.25 inch, 2 inch, M42×0.75, CS, C
back focus6.5 mm / 12.5 mm
cooledfalse
exposure range32 µs to 2000 s
max frame rate45 fps at full resolution
powerBus powered over USB
Sensor Height6.3mm
Sensor Width11.2mm
Editor’s Take
Planetary imaging is the one part of this hobby where a modest telescope and a good camera beat a large telescope and a poor one, because what you are really fighting is the atmosphere and the answer is frames per second. The IMX585 became the sensor everyone wanted for exactly that reason, and the interesting thing about this camera is not that it performs well but that it carries that sensor at a third of what the specification used to cost. The large sensor is the bonus nobody asks for and everybody appreciates the first time they shoot the Moon and find they need two panels instead of six.
— The Skynocular verdict
08AlternativesFor a different goal, start here.
2 alternatives, each mapped to the goal it wins at
08Alternatives
For a different goal, start here.
2 alternatives, each mapped to the goal it wins at