BT-120 - Binoculars Explore Scientific - Free user manual and instructions
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| Product Type | Binoculars |
| Brand | Explore Scientific |
| Model | BT-120 |
| Objective Lens Diameter | 120 mm |
| Magnification | 45x - 90x (depending on eyepieces) |
| Prism Type | BaK-4 Porro prisms |
| Coatings | Fully multi-coated optics |
| Field of View | 1.5° - 0.75° (depending on eyepieces) |
| Exit Pupil | 2.7 mm - 1.3 mm |
| Eye Relief | 15 mm - 12 mm |
| Interpupillary Distance | 56 - 74 mm |
| Focus Type | Dual-speed Crayford focuser |
| Dimensions (L x W x H) | approx. 450 mm x 250 mm x 180 mm |
| Weight | approx. 5.5 kg |
| Power Supply | None (manual operation) |
| Main Functions | Astronomical observation, terrestrial viewing |
| Maintenance & Cleaning | Use a soft brush or microfiber cloth; avoid solvents |
| Safety | Never point at the sun; use solar filter |
| Spare Parts & Repairability | Replacement eyepieces and accessories available |
| General Information | Designed for serious amateur astronomers |
Frequently Asked Questions - BT-120 Explore Scientific
What is the recommended use for the BT-120 binoculars?
The Explore Scientific BT-120 binoculars are designed for astronomical observation of celestial objects such as the Moon, planets, and deep-sky objects, as well as for long-distance terrestrial viewing.
How do I clean the lenses of my BT-120?
Use a soft brush to remove dust, then gently wipe with a microfiber cloth. For stubborn spots, use a lens cleaning solution specifically for optics. Avoid touching the glass with fingers.
Can I use the BT-120 for daytime terrestrial observation?
Yes, the binoculars can be used for daytime terrestrial viewing, but they are optimized for astronomy. The high magnification may cause heat shimmer during the day.
What eyepieces are compatible with the BT-120?
The BT-120 uses standard 1.25-inch or 2-inch eyepieces depending on the adapter. Explore Scientific offers a range of eyepieces for different magnifications.
How do I adjust the interpupillary distance?
Rotate the center hinge to align the eyepieces with your eyes. The distance range is 56 to 74 mm.
Is a tripod required for the BT-120?
Yes, due to the size and weight, a heavy-duty tripod is recommended for stable viewing. The binoculars have a mounting plate for standard tripod heads.
What is the warranty on the BT-120?
Explore Scientific offers a limited lifetime warranty for the BT-120, covering manufacturing defects. Check the manual for details.
Can I use solar filters with the BT-120?
Only use approved solar filters that cover the front of the objectives. Never use eyepiece filters or look at the sun without proper protection.
Why do I see double images?
Double images often indicate collimation issues. Check that both barrels are aligned. If the problem persists, contact Explore Scientific support.
How should I store the BT-120?
Store in a dry, dust-free environment, preferably in the original case. Cover the objectives to prevent dust accumulation.
User questions about BT-120 Explore Scientific
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USER MANUAL BT-120 Explore Scientific
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Product information
Brand : Explore Scientific
Model : BT-120
Category : Binoculars