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Takahashi SKY-90 specifications

Optical specifications

Spec. SKY-90
Optical design Fluorite Doublet
Optical mounting Air spaced (Fluorite in front)
Optical coatings Fully Multi-Coated
Aperture 90mm
Standard
Focal length 500mm
Focal ratio F/5.56
Resolution 1.29"
Limiting magnitude 11.5
Light grasp 165x
Image circle NA
Photo field NA
With reducer
Focal length 407mm
Focal ratio F/4.5
Image circle 45mm
Photo field 6.3°

Mecanical specifications

Longitudinal view (distance in mm)

Takahashi SKY-90 longitudinal view
Spec. SKY-90
Tube length 480mm/560mm
80mm retractable dew shield
Tube diameter 95mm
Tube weight 3.2kg