STF-4070C Color (Bayer) Camera
- Large, High Resolution 8.1 Megapixel CCD with 5.5 micron pixels
- Fast, Dual Channel Read Out
- Full Frame, High Res, Low Noise, 16-bit download in 0.5 seconds.
- Electronic shutter for fast exposure …
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- Large, high resolution 4 megapixel CCD with 7.4-micron pixels
- Fast, dual-channel readout
- Full frame, high res, low noise, 16-bit download in 0.25 seconds
- Electronic shutter for fast exposure times (0.001 to 3600 seconds)
- STX/STXL style pin-fin heat sink and 70mm fan
- Exceptional cooling delta greater than -50 Degrees C with air only
- Sapphire Chamber window
- Very low read noise ~ 9e-
- Very low dark current ~ 0.01e- at -20 Degrees C
- Antiblooming protection
- Uses STF 8-Position Filter Wheels and OAG
- Accepts Nikon and Canon EOS lens adapters
The STF-8050 camera comes in monochrome (STF-8050M) and two color models. The color models are available with either the standard Bayer Color FIlter Pattern (STF-8050C) or the higher sensitivity TRUESENSE Sparse Color Filter Pattern (STF-8050SC). The KAI-08050 Image Sensor is an 8-megapixel CCD in a 4/3″ (22 mm diagonal) optical format. Based on the TRUESENSE 5.5 micron Interline Transfer CCD Platform, the sensor features broad dynamic range, excellent imaging performance, and a flexible readout architecture. The TRUESENSE Sparse Color Filter Pattern provides a 2x improvement in light sensitivity compared to a standard color Bayer part.
- Available in Monochrome, Bayer Color Pattern or TRUESENSE Sparse Color Filter Pattern
- Progressive scan readout
- Flexible readout architecture
- High frame rate
- High sensitivity
- Low noise architecture
- Excellent smear performance
- Package pin reserved for device identification
Description of the TRUESENSE Sparse Color Filter Pattern.
The TRUESENSE Color Filter Pattern represents a new paradigm for obtaining full-color images from a single image sensor. By adding panchromatic (or “clear”) pixels to the standard red, green, and blue pixels traditionally used for color capture, image sensors can realize a significant increase in light sensitivity – between two and four times compared to standard designs – while retaining overall image quality and color fidelity. Image sensors using this design allow end users to capture better pictures and video under low-light conditions.
In addition to the new color technology, the STF-8050 has been optimized for fast full frame download and maximum cooling in an STF sized package. A high resolution 8.3 megapixel 16-bit frame will download in about 1/2 second using the dual channel readout mode. Even at this rapid download rate, the read noise remains exceptionally low, about 9e-. The tables below show download times and frame rates for the STF-8050 camera measured using SBIG’s high speed drivers:
STF-8050 Download time in seconds for single frame
Full Frame Half Frame Qtr Frame Planet Focus
High Res 0.59 0.41 0.27 0.06 4.3 fps
Med Res 0.48 0.28 0.16 0.06
Low Res 0.34 0.2 0.13 0.05
Ultra Low 0.16 0.11 0.08
STF-8050 Frames per second saved to disk using high speed drivers
Full Frame Half Frame Qtr Frame Planet Focus
High Res 2 3.4 5.3 4.3 4.3
Med Res 3.4 5.3 7.5
Low Res 4.5 6.6 8.6
Ultra Low 8.1 9.5 10
The astronomy customer will notice from the specifications that the STF-8050 is very similar to the STF-8300M in size and performance with the exception of the shutter and download rate. The STF-8050 was developed primarily for the OEM market, particularly for microscopy applications where short exposures and high frame rates made possible by an electronic shutter are more desireable than having a mechanical shutter for automatic dark frames. Because of this, the STF-8050 cooling design is very robust and the camera is capable of a cooling delta greater than -50 degrees C. This means that the camera at room temperature can cool enough to reduce the dark current to 1/100th of an electron per pixel per second, or less.
So in comparing the STF-8050 with SBIG’s 8300 models, the STF-8050 is faster and can take shorter exposures (0.001 sec.) whereas the STF-8300 or STT-8300 have higher QE, mechanical shutters and are more suitable for long exposures typical of deep space imaging. For these same reasons however the STF-8050 is an excellent choice for solar/lunar/planetary imaging and deep space with a filter wheel using one blocked slot for taking dark frames if desired.
The combination of a large 8.1 megapixel CCD, high resolution 5.5 micron pixels, low noise 16-bit images and fast exposure times make the STF-8050 camera ideal for solar and lunar imaging.
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