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The thermal expansion coefficient is smaller than that of ordinary glass
the coated side of the filter faces the telescope
The SV190 UF uses a corrected ultra-flat field optical design to reduce edge distortion
ZWO WiFi Extender
Dual Band Mobile Transceiver
Svbony SV202 Extra-Low Dispersion ED Binoculars telescope guiding camera The thermal expansion coefficient isSvbony SV202 Extra Low Dispersion ED Binoculars Extra Low Dispersion (ED) objective lenses provide high resolution, high contrast images virtually free of optical defects like chromatic aberration (colour fringing). BaK 4 prisms increase contrast and resolution for sharper more detailed images. Model F9351A F9351B Size 8x32 10x42 Prism Type BaK 4 prism BaK 4 prism Objective Lens Coating Fully multi coated Fully multi coated Eyepiece Diameter 21mm 21mm
