| Feature | Specification | |---------|----------------| | | ARM Cortex‑M4 @ 80 MHz (with DSP extensions) | | Memory | 256 KB Flash, 64 KB SRAM | | Sensors | • Temperature (‑40 °C → +125 °C, ±0.2 °C) • Humidity (0 % → 100 % RH, ±2 % RH) • 3‑axis Accelerometer (±16 g, 12‑bit) • Ambient Light (0 → 100 klx) | | Connectivity | BLE 5.2 (2 Mbps PHY), optional UART/SPI/I²C pins | | Power | 1.8 V – 3.6 V operation; < 2 µA standby, < 0.5 mA active (typical) | | Security | Hardware‑rooted secure boot, AES‑256 encryption engine | | Package | RoHS‑compliant, conformal‑coated PCB (IP65 rated) | | Development | SDK with FreeRTOS, Zephyr, and Arduino‑compatible libraries; pre‑compiled example firmware (sensor logger, BLE beacon, motion‑trigger) |
| Feature | My Take | |---------|---------| | | Metal barrel with a matte‑black finish; weather‑sealed (dust‑/splash‑resistant). Feels solid without the “heavy‑lens” intimidation. | | Autofocus | Fast, silent stepping‑motor (STM) AF; locks onto subjects in < 0.15 s even in dim light (ISO 6400). Slight hunting when chasing moving subjects, but overall reliable. | | Manual focus | Focus ring has a decent amount of travel, though the “click” feel is a little soft. Good for video work after a quick tweak. | | Image quality | Center sharpness is stellar right out of the gate (≈ 0.45 lp/mm on an 18‑MP APS‑C sensor). Edge performance improves after stopping down to f/2.8. Bokeh is smooth with a pleasing “onion‑skin” transition. | | Low‑light | f/1.8 renders clean images up to ISO 6400 with minimal noise (thanks to the high‑transmission ED glass). No need to push exposure for indoor portraits. | | Flare & Ghosting | A few noticeable flare artifacts when shooting directly into the sun – a thin hood helps, but the lens could benefit from better coating. | | Distortion | < 0.3 % barrel distortion at wide open; easily corrected in‑camera or in post. | | Weight | 380 g makes it a true “on‑the‑go” tele‑prime. I could mount it on a small gimbal without balance issues. | juy-108
: When looking for information on such items, you might try: | Feature | Specification | |---------|----------------| | |