SM-4 Binocular Pre-Autocollimator

The SM-4 Binocular Pre-Autocollimator is used to inspect the optical axis misalignment and magnification difference of binocular telescope systems. It is widely applied in specialized optical testing instruments and serves as one of the essential tools in the assembly and adjustment processes of optical instrument manufacturing. 1.Objective Lens Focal Length：80mm 2.Magnification：4X 3.Exit Pupil Diameter：5mm 4.Eye Relief：20mm 5.Field of View：10.5° 6.Resolution：≤7.5" 7.Eyepiece Adjustment Range：±5 Diopters 8.Reticle Graduation Value：10' 9.Effective Aperture：Φ20mm 10.Measurement Range（V/H）：±2°（Vertical & Horizontal） The instrument shall be placed in a dry, well-ventilated, shockproof workshop free from acid and alkaline gas corrosion. The indoor temperature shall be maintained within the range of 25±5℃, and the relative humidity shall not exceed 60%. It is strictly forbidden to touch the surface of optical components with hands or other contaminated items. If stains or spots are found on the surface, you may use clean absorbent cotton, soft cloth or silk dipped in a mixed solution of anhydrous ethanol and ether to gently wipe the contaminated areas. Never use hard-bristled brushes or dirty cotton/silk products to wipe the glass surface. Turn off the power immediately and cover the objective lens protector after each use. In case of equipment malfunction, be sure to ask professional personnel for repair. Do not disassemble or dismantle the equipment arbitrarily, so as to avoid unnecessary losses. When optical accessories such as the reticle and eyepiece are not in use, put them into the accessory case in a timely manner. Place a desiccant inside the accessory case and replace it regularly. If the instrument is not in use for a long time, store it in its special packaging box to prevent surface damage and appearance impairment.

• 4X Magnification & 10.5° Wide FOV, Balancing Observation Range and Details
• 20mm Long Eye Relief, Comfortable Viewing Even for Eyeglass Wearers
• ≤7.5" High Resolution + 10' Reticle Graduation, Ensuring Precise Measurement
• ±5 Diopters Eyepiece Adjustment, Suitable for Users with Different Vision Conditions
• ±2° V&H Measurement Range, Ideal for Multi-scenario Angle Measurement