Major features:

Although the CoStar is primarily intended as a high performance guider, it makes an excellent electronic finder and planetary imaging camera!

Costar autoguider



CoStar Autoguider 

A rear view of the CoStar, showing the USB and Guider ports. The CoStar is as small as a 1.25" eyepiece and weighs much less! 


  • Imager type: Aptina MT9M001 mono cmos chip with low dark current and anti-blooming.
  • Full resolution Pixel data: Pixel size: 5.2uM x 5.2uM, Image format: 1304 x 1024 pixels
  • Image area: 6.66mm (Horizontal) x 5.32mm (Vertical).
  • Spectral Response: QE max at 620nM (~65%), 35% at 400nM and 770nM. 
  • Readout Noise: Less than 40 electrons RMS - typically only 20 electrons. 
  • Anti-blooming: Overload margin greater than 1000x.
  • Dark current: Dark frame saturation time greater than 10 minutes. Less than 1 electrons/second @ + 10C ambient.
  • Data format: 10 bits.
  • Computer Interface: Built-in USB 2.0 compatible interface. 
  • Image download time: Typically 0.1 seconds at full resolution using USB 2.0.
  • Power requirements: USB powered.
  • Cooling system: Ambient air cooling.
  • Size: 32 x 60mm black anodised aluminium barrel with 25 x 0.75mm 'C mount' thread at the CCD window end & input/output plugs at rear. 
  • Weight: approx. 45g.


A single raw 5 second exposure through an F5 80mm aperture guide 'scope.


The same star field taken with the Lodestar, using the same 'scope and exposure time.


The Lodestar is clearly more sensitive, with less noise, but the CoStar still works very well as a guider and also makes an effective Lunar/Planetary camera.