Description
This kit from QHY combines the 268 Monochrome Photographic camera with and a CFW3 Medium (Ultra-Slim) or Large Filter Wheel.
For more information on component parts, see individual pages for the , .
As for QHY268M Combo, first there’s no doubt that 2-inch filters are large enough, but they’re not affordable enough. With a rough estimate of us, 36mm filter can be matched with scopes whose focal ratio are large than f/5 (f/4 worths a try, too). However, if your scope has a small focal ratio like 1/2.8, we don’t recommend 36mm filters.
| Model | BFL Consumed | Filters Supported |
| QHY268M | 12.5mm | |
| CFW3M-US | 17.5mm | 7 position
36mm unmounted |
| CFW3L | 21.5mm | 7 position
2inch mounted/50mm unmounted |
| OAGM | 10mm |
The New Combo B1 is designed to be more flexible to achieve multiple output specifications. Since June 2023, we are adding a 5mm spacer with M54 threads into Adapter kit B1. This addition gives the user a choice of terminating the output in either M48 or M54 threads. You can get 55/56mm BFL with M48/M54 threads according to your needs. Since are standard accessories included with the camera, this addition has no affect on the price.
55mm M48/M54 are suitable for standard flatteners and multiple purpose coma correctors (MPCC), while 56mm M54 threads are common for Takahashi reflectors.
The QHY600M-PH SBFL and QHY268M with CFW3L filter wheel can fit an optional Canon EF or Nikon F Lens Adapter without additional spacers. Smaller filter wheels may require additional spacers.
From 2023, the top part of QHY268C will change to the shorter one just like that of 268M. In fact, you can get the “SBFL(shorter back focal length” version of 268C right now.
The previous 268c has a back focal length of 17.5mm, and since it cannot connect to the scope without CAA, so it’s actual BFL is 17.5mm+6mm=23.5mm. Now after the change, 268C’s BFL will be shorten to 14.5mm, which provides more spaces for a filter wheel drawer, or an eletric CAA, or DSLR Lens, etc.
The new 268C adapts a new kit B4 which can best make use of the standard accessories. B4-2 and B4-3 share common parts from the necessary B4-1(for MPCC) .When you need to connect Canon or Nikon lens, you only need to get one Canon/Nikon adapter, not a “kit” like D2 or D3 anymore.
Specifications
Camera
| Model | QHY268M |
| CMOS Sensor | SONY IMX571 M |
| Mono/Color | Mono |
| FSI/BSI | BSI |
| Pixel Size | 3.76um x 3.76um |
| Effective Pixel Area | 6280*4210 (includes the optically black area and overscan area) |
| Effective Pixels | 26MP |
| Sensor Size | APS-C |
| A/D Sample Depth
| Native 16-bit (0-65535 greyscale) A/D |
| Full Well Capacity (1×1, 2×2, 3×3) | 51ke- 75ke- or above in extended full well mode |
| Full Frame Rate | USB3.0 Port: Full Resolution 6.8FPS @8BIT 6FPS @16BIT 2048lines 13.6FPS @8BIT 11.5FPS@16BIT 1080lines 25.4FPS @8BIT 19.5FPS@16BIT 768lines 35FPS @8BIT 25FPS@16BIT 480lines 50FPS @8BIT 34FPS@16BIT |
| Readout Noise | 1.1e- High Gain,
3.5e- Low Gain (5.3e- to 7.4e- in extended full well mode) |
| Dark Current | -20C，0.0005e /pixel/sec
-10C，0.001e /pixel/sec |
| Exposure Time Range | 30us-3600sec |
| Unity Gain* | 0（PH Mode）
30（Extended Full Well Mode）
*With the improvement of the CMOS technology, the 16bit CMOS camera has been released, like QHY600/268/411/461. For these cameras, even in lowest gain it has beyond the requirement of unit gain (less than 1e/ADU due to sufficient samples) So you can directly set gain0 as start. Please note QHY600/268C/411/461 has extend full well mode. In this mode you still need to find out the unit gain position.
|
| Amp Control | Zero Amplifer Glow |
| Firmware/FPGA remote Upgrade | Fully support via Camera USB port |
| Shutter Type | Electronic Shutter |
| Computer Interface | USB3.0 |
| Built-in Image Buffer | 1GByte DDR3 Memory |
| Cooling System | Two-stage TEC cooler
Less than 1S lower than ambient temperature -30C in continuous mode More than 1S continuous mode or lower than ambient temperature -35C in single frame mode （Test temperature +20°） |
| Optic Window Type | AR+AR High Quality Multi-Layer Anti-Reflection Coating |
| Anti-Dew Heater | Yes |
| Humidity Sensor* | Yes |
| Telescope Interface | Support M54 and M48 (with standard adapters ) |
| Back Focal Length | QHY268M: 12.5mm (with CAA) If used with the QHY filter wheel, the actual calculated intercept is 12.5mm.The actual BFL (the intercept from the CMOS chip to the top of the camera) is 14.5mm. Since most uses will match CFW with monochrome cams, please take 12.5mm as major reference. Check the mechanical drawing below for details. Note 14.5mm rear intercept does not include adapter thread, which must be used with adapters of various sizes through the top 6 screw holes. |
| Weight | 855g |
Filter Wheel
Model | CFW3M-US | CFW3L |
Back Focus Consumed | 17mm+2mm | 21.5mm |
Filter Supported | 7 position 36mm unmounted | 7 position 2inch mounted/50mm unmounted |
Available height limitation | 5.5mm | 10mm |
Weight | 691g | 911g |
OAG
| Telescope Interface | M54/0.75 |
| Diameter of 6 x M3 screw hole positions | 62mm |
| Suitable for CCD/CMOS Size | 4/3 inch APS-C, APS-H, 36 x 24mm |
For all orders exceeding a value of 100USD shipping is offered for free.
Returns will be accepted for up to 10 days of Customer’s receipt or tracking number on unworn items. You, as a Customer, are obliged to inform us via email before you return the item.
Otherwise, standard shipping charges apply. Check out our delivery Terms & Conditions for more details.
