聚焦放大镜

4级聚焦放大镜有最好的稳定性和承重处理能力，不论是它的聚焦视野还是他的价格范围。4级放大镜融合了精密滚动轴承的平稳滑动和高的显微镜套筒，已达到消除图像偏移和增加稳定性。高强度的套筒增加了承重能力，用于配合所有的目镜化合物。

The Phase 4 has the best stability and weight handling capacity of any visual focuser in it's price range.  The Phase 4 incorporates the smooth action of four precision ball-bearings and high draw tube loading to eliminate image shift and increase stability.  High draw tube loading increases weight capacity for handling any eyepiece combinations, cameras or CCDs.  AstroSystems has maintained the low 1.55" profile you've come to expect.