Russian telescopes: 120 mm, f/6,7 newtonian reflector TAL-120, telescope for amateur astronomy

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TAL telescopes: TAL-120

The TAL-120 incorporates an integral multi-coated negative achromatic lens in the base of the focuser to provide an effective focal length of 805mm in a very short tube. The result is a Newtonian reflector with an aperture of 120mm (4.7 inches) with a focal ratio of f/6.7 that is just as powerful but lighter and more compact than conventional models. The mounting and accessories are identical to those included with the popular TAL-1 model, except an adaptor for prime-focus photography with a 35mm SLR camera is also included. The TAL-120M includes a motor drive.

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Standard Specification
Aperture, mm	120
Focal length, mm	805
Focal ratio	1:6.7
Resolving power	1.2"
Limiting visual magnitude	12.3m
Magnification, min	32x (f=25mm)
Magnification, max	162x (f=15mm and Barlow 3x)
Optical scheme	Newtonian
Angular visual field, max	1°36' (f=25mm)
Angular visual field, min	15' (f=15mm and Barlow 3x)
Minimum observing distance, m	65
Range of slow-motion control on the axes within	±4°
Latitude range of mounting	0...70°
Magnification of the finderscope	6x
Angular field of finderscope	8°
Voltage of the supplying mains, V	220 (110) ±10%
Current frequency, Hz	50 (60)
Output voltage of the supply unit, V	12
Dimensions, mm	640x780x1400
Dimensions of the plywood case, mm	870x460x320
Weight of the telescope, kg	20
Weight of the telescope packed, kg	22