Astronomy Specialist
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TAKAHASHI 645 SUPER REDUCER FOR CCA-250

$4,499.00AUD
SKU: TK-TKA86580L

Takahashi

 

The Takahashi 645 Super Reducer is a 0.72x focal reducer for the CCA-250 corrected-Cassegrain astrograph. The 645RD reducer has a large image circle of 60mm, making it suitable for use with medium format sensors. The 0.72x reduction factor reduces the focal length to 890mm and focal ratio to f/3.6, transforming the CCA-250 into a high performance super astrograph.

The 645RD Reducer consists of four large-diameter lenses in four groups, giving illumination of more than 70% at the edge of the field. The illumination over a 44mm diagonal (such as that of a full-frame sensor) is more than 90%. The lenses are coated with broad-spectrum multi-layer coating, reducing reflections and increasing transmission over the visible range.

 

 

Spot diagram of Takahashi CCA-250 with 645 Super Reducer CA 0.72x focal reducer.

 

    Specifications

     

    Optical design 4 lenses in 4 groups
    Reduction factor 0.72 x
    Backfocus 56.2 mm
    Image circle 60 mm
    Connection telescope side
    		 Screwed directly to CAA TKP86200
    Connection camera side
    		 M72 x 1 male
    Total length
    		 74.2 mm
    Weight
    		 200 g
    SKU
    		 TK-TKA86580L


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