QHY268 PH Colour Camera
QHY
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This camera Is normally shipped to order with a delivery time of 2-4 weeks. Please contact us to confirm current pricing and delivery times.
Overview
The QHY268M/C is a new generation of back-illuminated CMOS cameras with true 16-bit A/D and 3.76um pixels. This new Sony sensor is an ideal CMOS sensor exhibiting no amplifier glow. 16-bit A/D gives high-resolution sampling of the whole full well range. Digitizing 0-65535 levels yields a smooth image with a continuous gradation of greyscale levels. The QHY268M/C is a cooled, back-illuminated, CMOS camera based on the Sony IMX571 sensor with native 16-bit A/D and 3.76um pixels.
The QHY268C is a new generation of back-illuminated CMOS cameras with true 16-bit A/D and 3.76um pixels. This new Sony sensor is an ideal CMOS sensor exhibiting no amplifier glow. 16-bit A/D gives high-resolution sampling of the whole full well range. Digitizing 0-65535 levels yields a smooth image with a continuous gradation of greyscale levels. The QHY268C is a cooled colour, back-illuminated, CMOS camera based on the Sony IMX571 sensor with native 16-bit A/D and 3.76um pixels.
Native 16-Bits
The Sony IMX571 sensor has on-chip 16-bit A/D for highest resolution of greyscale. The output is real 16-bits with 65536 levels. Compared to 12-bit and 14-bit A/D, 16-bits provides higher sampling resolution. At high gain, the camera yields close to 1e-/ADU with no sample error and low read noise.
High Dynamic Range
Great full well brings vivid colors. One benefit of the back-illuminated CMOS structure is improved full well capacity. This is particularly helpful for sensors with small pixels. Even with unbinned, the 3.76um pixels of the QHY268C has a superb full well capacity of 75ke-.
Ultra Low Read Noise
- 0.7e- Noise at High gain
- 3.5e- Noise at Low Gain
The QHY268C has only 0.7 electron of read noise at highest gain and 6.8 FPS at full resolution readout speed. One electron of read noise means the camera can achieve a SNR>3 at only 4 to 6 photons. This is perfect performance when conditions are photon limited, i.e., short exposures, narrow band imaging, etc., making this large area sensor ideal for sky surveys and time domain astronomy.
Back-Illuminated, High QE
The back-illuminated Sony Exmor sensor has about twice the QE of similar front illuminated sensors. The QHY268C has zero amplifer glow. In addition the dark current is only 0.0005e/pixel/sec @ -20C.
Full technical details can be found at
https://www.qhyccd.com/astronomical-camera-qhy268/

QHY268C PH Specifications
| Attribute | Details |
|---|---|
| Model | QHY268C PH |
| CMOS Sensor | SONY IMX571 |
| Mono/Color | Colour |
| FSI/BSI | BSI |
| Pixel Size | 3.76μm x 3.76μm |
| Effective Pixel Area | 6252 x 4176 |
| Total Pixel Area | 6280 x 4210 (includes optical black area and overscan area) |
| Effective Pixels | 26 Megapixels |
| Sensor Size | APS-C |
| A/D | Native 16-bit (0-65535 greyscale) A/D |
| Full Well Capacity | Standard Mode: 51ke- Extended Full Well Mode: >75ke- |
| Frame Rates |
Full Resolution: 6.8FPS@8bit, 6FPS@16bit ROI: 2048 lines: 13.6FPS@8bit, 11.5FPS@16bit 1080 lines: 25.4FPS@8bit, 19.5FPS@16bit 768 lines: 35FPS@8bit, 25FPS@16bit 480 lines: 50FPS@8bit, 34FPS@16bit |
| Readout Noise | 1.1e- to 3.5e- (5.3e- to 7.4e- in Extended Full Well Mode) |
| Dark Current | 0.0005e-/pixel/sec @ -20℃ 0.001e-/pixel/sec @ -10℃ |
| Exposure Time Range | 30μs - 3600sec |
| Recommended Gain | 30 (PH Mode, or Extended Full Well Mode) 56 (High Gain Mode) |
| Amp Control | Zero Amplifier Glow |
| Shutter Type | Electronic Rolling Shutter |
| Computer Interface | USB3.0 |
| Built-in Image Buffer | 1GB DDR3 Memory Buffer |
| Cooling System |
Dual Stage TEC cooler: - Long exposures (> 1 second) typically -35℃ below ambient - Short exposures (< 1 second), high FPS, typically -30℃ below ambient (Test temperature +20℃) |
| Optic Window Type | AR+AR High Quality Multi-Layer Anti-Reflection Coating |
| Telescope Interface | Support M54 or M48 (combined with adapters) |
| Back Focal Length | 14.5mm (±0.2) |
| Anti-Dew Heater | Available |
| Firmware/FPGA Remote Upgrade | Available via Camera USB port |
| Weight | 810g |
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from 231 reviewsAs a complete novice this is easy setup and go I already have some amazing nebula images
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I haven't had as much viewing opportunities as I would like but you can't do much when you have 2 weeks of constant overcast. I like the crayford focuser, and the finderscope is high quality with a good aperture, the views of Jupiter, the moon, Carina and Orion nebula and Omega centauri have been great with the 30mm super view and 9mm, thinking about getting a 6mm, Barlow lens and a neutral density filter to expand my arsenal, so far going from a 60mm refractor to a 8in Newtonian hasn't been too hard. Collimating for the first time was a challenge but i have it sorted out. Only few things to point out is I don't think I got a manual but the video was plenty helpful, perhaps you could sell dew shields for the finderscope and to protect the secondary mirror as well as telescope heaters for active protection, potentially some new videos starring Andrew about star hopping to find dim DSO's without a computerized mount. Overall very happy with my purchase, with the 8in dobsonian being known as a lifetime scope I know It will always have a place in my heart even if I do upgrade to bigger and better scopes. Thank you Andrew for your great customer support and service. I bid you clear skies from the deep south!