<ul><li>Auxiliary Mirror Size Available: 20/25/30/35/40/42/50/54mm. Coating: Aluminum Reflection + Protective Film.</li><li>Type: Elliptical Mirror. Surface Accuracy PV: 1/4-1/6. Tolerance: 0.5.</li><li>Packed in nice gift box,great crystal decor gift idea for whom pursuing elegance and beauty in life.</li></ul><br><br>

Prisms & Kaleidoscopes Elliptical Secondary Mirror 20mm 25mm 30mm 35mm 40mm 42mm 50mm 54mm for Astronomical Telescope Science Classroom Optics Kits (Size : 30mm)