Specification Brand : AMNOUR BulletPoint1 : Type: Elliptical plane mirror BulletPoint2 : Auxiliary mirror size optional: 20/25/30/35/40/42/50/54/70mm BulletPoint3 : Tolerance: ±0.5 BulletPoint4 : Surface accuracy PV: 1/4-1/6 BulletPoint5 : Coating: Aluminum reflective + protective film Color : One Color ExternallyAssignedProductIdentifier : 3230361144984 ItemName : Short axis secondary mirror 25mm 30mm 35mm 42mm 50mm 54mm 70mm 114 203 Reflecting telescope elliptical oblique secondary mirror(35mm) ItemPackageDimensions_Height : 1 centimeters ItemPackageDimensions_Length : 3 centimeters ItemPackageDimensions_Width : 2 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : science-classroom-optics-kits Manufacturer : JTSF ModelNumber : JTSF9648 NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : JTSF9648 ProductDescription : Minor axis: refers to the length of the short side diameter 20mm short axis secondary mirror, short side length 20mm, surface coated with aluminum film and protective film, suitable for use with 76mm aperture reflective primary mirror. 25mm short axis secondary mirror, short side length 25mm, surface coated with aluminum film and protective film, suitable for use with 114mm aperture reflective primary mirror. 35mm short-axis secondary mirror, short side length 35mm, surface coated with aluminum film and protective film, suitable for use with 127mm, 133mm, 135mm, 150mm, aperture reflective primary mirror. 40mm short axis secondary mirror, short side length 40mm, surface coated with aluminum film and protective film, suitable for use with 127mm, 133mm, 135mm, 150mm, aperture reflector primary mirror. 70mm short axis secondary mirror, short side length 70mm, surface coated with aluminum film and protective film, suitable for use with 203mm diameter reflective primary mirror pack: 1 short-axis secondary mirror Size : 35mm