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Parameters
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Aperture size
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91mm
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Focal length
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609mm
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Focal ratio
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f/6.7
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Objective lens
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Quadruplet air-spaced APO(including one ED glass)
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Image circle
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44mm
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Maximum accessory connection (with the focuser fully retreated)
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Imaging mode:
75mm (from the base of M48×0.75 male thread）
93mm（from the base of M54×0.75 male thread)
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Observing mode:
112mm（from the end of 1.25" eyepiece holder）
122mm（from the end of 2" eyepiece holder）
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Minimum accessory connection (with the focuser fully extended)
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Imaging mode:
45mm (from the base of M48×0.75 male thread）
63mm（from the base of M54×0.75 male thread)
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Observing mode:
82mm（from the end of 1.25" eyepiece holder）
92mm（from the end of 2" eyepiece holder）
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Total length
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513mm(including 1.25" adapter as dew shield contracted）
599mm(including 1.25" adapter as dew shield fully stretched）
550mm(including the photographic adapter as dew shield contracted）
636mm(including the photographic adapter as dew shield fully stretched）
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Focuser travel length
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30mm
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Net weight
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3.92kg
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Gross weight (Including tube ring&dovetail plate)
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4.52kg
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Rear-end thread type
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M64×1-M54×0.75
M54×0.75-M54×0.75
M54×0.75-M48×0.75 (with M48×0.75 filter thread)
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Standard package items
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A 91F OTA，a pair of tube rings, a handle, a 230mm Vixen dovetail plate,a set of photographic adapters |
