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GoldFocus Plus Collimation Focusing System

The GoldFocus Plus Collimation Focusing System supports precision focus and collimation

If you are instead interested in a GoldFocus High-Precision Focusing System, which supports high-precision focus but not collimation, then click here.

The GoldFocus Plus Focusing System for digital astronomical imaging is a combination of a scientifically designed GoldFocus Plus Mask and the GoldFocus Analysis Software.  The GoldFocus Plus Focusing System works with most astronomical CCD cameras and over 400 DSLR camera models.

Achieve better focus and collimation faster than ever.

"I used to think that I had accurate collimation of my AT8RC using the 'defocused star/concentric ring' test.  But after using GoldFocus Plus, collimation is tack sharp and has never been this good.  GoldFocus Plus is the reason for it.  I will definitely be using GoldFocus Plus to collimate in the future." -- Joel Short

GoldFocus Plus Features

Mask #GN61
GoldFocus Plus Collimation Mask: example mask for a Newtonian reflector, models also available for Cassegrains and refractors
  • more accurate collimation than other collimation methods (see also collimation techniques)
  • more accurate focus than other focusing methods, 3-5 times more accurate than alternative focusing methods (see also focus techniques and signal-to-noise)
  • very fast focus and collimation, only minutes to near-perfect focus and collimation with a good quality focuser (see also how GoldFocus works)
  • easy to use, very short learning curve
  • unbiased and accurate objective quantitative focus and collimation measurements
  • auto-focus for power focusers using the ASCOM interface
  • scientific design based upon advanced theories of optics (see also technical background)
  • optional Step-by-Step QuickStart for best focus and collimation the first time you use GoldFocus Plus
  • optional voice feedback of focus quality
  • night-vision friendly
  • 3 separate designs accommodate Cassegrain, Newtonian, and refractor telescopes
  • standard sizes accommodate most typical telescopes
  • custom sizes available upon request
  • comprehensive help documentation and on-line FAQ
  • unlimited free technical support

Works With ...

GoldFocus Analysis Software: example showing excellent focus and collimation
  • most digital cameras including scientific CCD and DSLR cameras
  • all telescopes including refractor, reflector, and catadioptric designs
  • typical aperture diameters, f/ratios, and focal lengths
  • all focusers including rack and pinion, Crayford, integrated, and electronic motorized
  • monochrome and color digital cameras capable of saving FITS, JPEG, TIFF, or raw DSLR file format images
  • wide range of camera physical pixel sizes
  • with or without pixel binning
  • full range of wavelengths of visible light
  • narrowband wavelengths with color and narrowband imaging filters
  • normal seeing conditions, poor to excellent


  • astronomical CCD or DSLR camera with image capture software capable of saving FITS, JPEG, TIFF, or raw DSLR file format images is required
  • GoldFocus Plus Mask can be used without the GoldFocus Analysis Software for visual observing or film photography (see also FAQ)
  • PC with Windows operating system, versions 2000 Professional, XP, Vista, Windows 7,  8,  8.1, or 10

More Information

  • Overview - How GoldFocus Plus Works
  • Features - Feature Comparison with other methods
  • Technical - Science behind the design
  • FAQ - Frequently Asked Questions
  • Product Review - Read an Astronomy Technology Today review
  • Purchase - Purchase the GoldFocus Plus Mask and Analysis Software