The Explore Scientific FirstLight 152mm f/12.5 Alt-Az Maksutov-Cassegrain Telescope is ideal for users who want a portable yet powerful observation platform that is able to achieve high magnifications and has the ability to make detailed observations of both near- and deep-sky subjects. The Maksutov-Cassegrain optical configuration is engineered with a convex meniscus lens that not only eliminates the need for periodic collimation, but by the nature of the lens requires a smaller secondary mirror that limits obstruction and increases contrast. The Maksutov optical path results in a slower focal ratio and narrower field of view versus a similar-sized Schmidt design, but the optical benefits make this a useful scope for planetary and double-star observation.
The scope features the manual Twilight I alt-azimuth mount with dual-axis control cables that allows users to track objects as they move across the night sky. Its stainless steel tripod provides a stable observation platform, and its adjustable height from 38.5 to 55.5" allows for comfortable viewing by most users. Explore Scientific includes several observational accessories including a 25mm eyepiece that yields 76x, a 90° star diagonal to put the user's head in a comfortable viewing angle, a universal smartphone eyepiece adapter for easy astrophotography, and a wide-field unmagnified red-dot finderscope.
- 152mm aperture
- f/12.5 focal ratio
- 1900mm focal length
- Compact Maksutov-Cassegrain optical configuration
- Front convex meniscus lens corrects spherical and chromatic aberrations and comas (off-axis aberrations) across the entire field of view
- Smaller secondary mirror versus Schmidt-Cassegrains reduces obstructions and increases contrast and sharpness
- Internal focusing mechanism with 1.25" visual back
- Manual alt-azimuth single-arm fork mount
- Dual-axis slow-motion tracking cables
- Cables terminate in easy-to-manipulate knurled knobs
- Quick release Vixen-style dovetail saddle
- 2" stainless steel legs
- Three leg sections with thumbscrew locks
- Adjustment range with head: 38.5-55.5"
- Fully collapsed with head: 42"
- Fully collapsed without head: 29.5"
- Accessory tray doubles as leg stabilizer for additional rigidity and vibration reduction
- 1.25" 25mm Plössl eyepiece yields 76x magnification
- 1.25" 90° star diagonal places head in comfortable position, especially when OTA is aimed at or near the zenith
- Smartphone adapter attaches over eyepiece and allows any smartphone to be used for astrophotography
- Red-dot finder: Unmagnified for fast subject acquisition with variable red illumination to protect night-adjusted vision