Discussion in 'Filter Wheels' started by Jason Handel, Jan 16, 2019.

  1. Jason Handel

    Jason Handel Standard User

    Dec 21, 2018
    The product description indicates that the optics involved in this filter wheel have a built in focal reducer to allow for a larger FOV. I haven't gotten to the point of setting up and guiding yet, but I am anticipating that I may need to know the amount of 'focal reduction' so that auto-guiding software understands what the new effective focal length of the entire system will be. Am I thinking about this correctly ?

    Is the amount of focal reduction for this equipment available ?
  2. Doug

    Doug Staff Member

    Sep 25, 2014
    It’s approximately o.6X IIRC.

    Typically the software figures out the movement rates using a simple calibration step. You shouldn’t need this information to operate the guider.

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