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Opticstar SL-131C COOLAIR
Planetary, Lunar and Solar Imaging at up to 160 Frames Per Second
Opticstar SL-131C COOLAIR
The SL-131C COOLAIR video camera. Left: 0.25" photographic thread. Right: 1.25" nosepiece included.
  • Sensor: 1/3" CMOS 10-bit Colour
  • Sensor Resolution: 1280(H) x 1024(V)
  • Frame Rate:
    • 15 FPS @ 1280x1024
    • 110 FPS @ 640x480
    • 160 FPS @ 320x240
  • USB 2.0 Powered
  • Hardware Gain
  • Robust aluminium alloy body
  • No Infra Red filter
  • Suitable for Lunar and Solar imaging
  • Air-Cooled with internal fan
  • Bundled Software:
    • Opticstar View
    • etAMACAP
  • Computer Requirements:
    • Microsoft Windows (32-bit & 64-bit) XP/Vista/7/8/10
    • USB 2.0 port
Opticstar SL-131C suitability.
CCD Cameras
CCD Cameras Opticstar
CCD Camera
Opticstar SL-131C COOLAIR
The package contains the following:
Order No. Price (inc_VAT) Shipping Delivery click to purchase
OSRSL131CCA £ 69.00 £ 6.00
Setup Guide
Opticstar CCD Cameras
(Brochure, PDF)

The SL-131C COOLAIR is a high-resolution 1.3 mega-pixel colour camera that can be used to capture images of the Sun and Moon. The camera is very easy to use and provides a quality, low noise affordable solution for viewing or capturing digital video from the telescope and recording it to your computer at a maximum 1.3 mega-pixel resolution. It is ideal for newcomers to astronomy who wish to capture high resolution images of bright objects such as the planets, Moon and the Sun (with a solar scope or suitable filters).
The SL-131C does not incorporate an infra-red block filter but can be fitted as an optional extra. The camera will operate at a maximum true resolution of 1280x1024 but lower resolutions of 640x480 and 320x240 are also supported.

The camera is cased in a robust metal body and can be connected to any telescope with a standard 1.25" drawtube. Additionally, the SL-131C has a 0.25" photographic thread that enables it to be attached to a photographic tripod. A PC with a USB2.0 port running Microsoft Windows XP or later is required.

Image by Naoki Yokoo with SL-131C COOLAIR.

Opticstar View - Camera Control Software
The camera is recommended for lunar and solar (with a solar filter) imaging. It includes Opticstar View software for image capture and camera control with a point and click interface. It can capture single frames, a series of single frames in BMP format or in AVI video format. The captured video data can optionally be compressed if required in MPEG-4 format.
Opticstar camera control software.
Opticstar View for camera control and image processing.

A brief outline of View’s image processing functions is listed below:
  • Basic operations including Crop, Mirror, Flip, Invert, Rotate, Bright, etc.
  • Copy and paste user defined regions.
  • Distances can be measured between user defined points, circles, etc.
  • Angles can be calculated by defining three points on the image.
  • Operations can be performed on any user defined region.
  • Colour operations can be performed on individual R, G, B channels.
  • Data combine of two images.
  • Data calibration.
  • Image-zoom as a per cent of the original image.
  • Linear filters to soften, sharpen, emboss, blur and Gaussian.
  • Non-linear filters for median, erode, dilate, contour, edge and jitter.
  • Transform filters for pinch, punch, twirl and cylinder.
  • Fluorescence filters for gamma, colorize, mix and combine.
EtAMCAP - Camera Control Software
EtAMCAP is the second program bundled with the camera. It can be used to control the camera and capture video in AVI format. This program does not include any image processing functionality but the captured video files can be processed in other software such as Deep Sky Stacker, Registax, Paintshop, Photoshop, etc.
EtAMCAP camera control software.
EtAMCAP camera control software.

Image Quality
The SL-131C camera can stream and store video to disk at up to 15 frames per second at 1280x1024 resolution, it can also grab single frames at 1280x1024. All video and single frames are captured without compression, ensuring high image quality. Higher frame rates can be achieved by reducing the resolution via the camera control software.

The ability of the camera to capture and store high quality video to disk in real-time provides the data required for stacking any number of frames to create a single greatly enhanced quality image using image stacking software, these include the excellent AstroArt V4.0 and freely available Deep Sky Stacker or Registax. AstroArt is more relevant when you want to manipulate the image but without altering the underlying data, AstroArt is therefore highly suitable for photometry.
Optionally, the SL-131C incorporates a removable x0.5 focal reducer nosepiece that can double the field of view if required. An extension 5 metre USB lead with a USB repeater (amplifier) is also available in cases where the camera will be used further away from the computer.

Model Opticstar SL-131C COOLAIR
Sensor Aptina MT9M111
Optical Format 1/3" CMOS colour sensor
Resolution 1280(W) x 1024(H)
Pixel Size 3.6µm x 3.6µm
Sensitivity 1.1v/Lux-sec at 550nm
Colour Bayer RGB Mosaic 24-bit (3 x 8-bit) Uncompressed output
Frame Rate 15fps @ 1280x1024
110fps @ 640x480
160fps @ 320x240
Shutter Electronic Rolling
Window glass Clear, no Infra Red cut-off
Exposure Time Automatic or Manual
Manual Exposure Time 0.12 milliseconds to 57.6 milliseconds (normal mode);
0.06 milliseconds to 28.8 milliseconds (high speed mode)
ADC 10-bit, dual on-chip
Dynamic range 71db
Signal to Noise Ratio 44db (max)
Gain in hardware
Computer Interface USB 2.0 with 1.8 metre cable
Power Requirement USB 2.0 Bus Power
Mounting to telescope C/CS to 1.25" (included)
Mounting to lens C to T-thread, M42 x 0.75
Mounting to microscope C to 23mm, C to 30mm, C to 30.5mm
Weight 250 grams
Operating temperature 0°C to 60°C
Bundled software Opticstar View, etAMCAP
Operating System Microsoft Windows (64-bit & 32-bit) XP/Vista/7/8/10
All information correct at the time of writing.

SL-131C Sample Images
Please click on the images below to expand to their full size.
Sample image. Sample image.
The Moon. 49.8% Waxing Gibbous Moon
Image by Gary Yule captured on 2018-04-22 from Manchester, England
Opticstar ARX200 f/3.9 8" Astrograph
Rowan Belt Modded HEQ5
Opticstar SL131-C Coolair Camera
Opticstar Crysral View Filter
30 x 1/250
ISO 400
Stacked and Processed in Registax 6
Click image to enlarge

The Moon. 73.1% Waxing Gibbous Moon.
Image by Gary Yule captured on 2018-03-25 from Manchester, England
Opticstar ARX200 8" Astrograph f/3.9
SL-131C Coolair Camera
30 x 0/250 secs exposures
Stacked in Registax 5
Processed in Opticstar View
Shot through light cloud in Stretford, Manchester
Click image to enlarge

Sample image. Sample image.
Image by Naoki Yokoo, Japan.
SL-131C, Maksutov 150mm.
2X achromatic barlow (only using the cell).
Click to expand image to full size.

The Sun.
Image by Naoki Yokoo, Japan.
SL-131C, P.S.T.
2X achromatic barlow lens (only using the cell)
Click to expand image to full size.

Sample image. Sample image.
Image by Naoki Yokoo, Japan.
SL-131C, Maksutov 150mm.
Prime focus.
Click to expand image to full size.

The Sun.
Image by Naoki Yokoo, Japan.
SL-131C, P.S.T.
2X achromatic barlow lens (only using the cell)
Click to expand image to full size.

We are constantly checking the accuracy of the technical data. We are prepared to provide more detailed information on request. Technical data is subject to change without notice.

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