90degreemirrorglasses

This article was reviewed by Anne Schmidt. Anne Schmidt is a Chemistry Instructor in Wisconsin. Anne has been teaching high school chemistry for over 20 years and is passionate about providing accessible and educational chemistry content. She has over 9,000 subscribers to her educational chemistry YouTube channel. She has presented at the American Association of Chemistry Teachers (AATC) and was an Adjunct General Chemistry Instructor at Northeast Wisconsin Technical College. Anne was published in the Journal of Chemical Education as a Co-Author, has an article in ChemEdX, and has presented twice and was published with the AACT. Anne has a BS in Chemistry from the University of Wisconsin, Oshkosh, and an MA in Secondary Education and Teaching from Viterbo University. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 748,709 times.

TrueMirror

Dielectricmirror

Built-in brass pressure ring, you can never have to fear of damage, since brass pressure ring provides non-contact personal protection for eyepiece.

Designed with enhanced aluminum die, SV221 can provide higher light transmittance & clear vision. 1.25 inches diameter which can be applied to a 1.25 inches telescope and a 1.25 inches eyepiece.

With a 90 degree design, you don't have to bend over when performing visual observation and the observation experience can be more comfortable.

45 degreemirror

If you are a machinist, manufacturing, or engine professional, exact measurements are an everyday must. When it comes to measuring cylindrical or spherical objects, an outside micrometer would be the best tool to use. A well calibrated micrometer can be difficult to use, but with patience and practice, this tool can be a part of your skill set.

Note: This diagonal can only be used with refractor telescopes and some catadioptric telescopes like Schmidt-Cassegrain, Maksutov-Cassegrain, etc. It not meant for use with Newtonian / DOB reflector telescopes or other variants of Newtonian telescopes.

1.The main mirror housing is made of precision molded ABS plastic and the two end barrels are precision machined from aluminum2.92% above reflectivity across the visible spectrum 3.Brass lock Screw for eyepiece or adapter and brass Compression rings features more precision and prevent barrels or the surface of eyepieces from marring and scratching4.With dustproof cover, can keep the lens cleaning5.Support connection 1.25inch filter, internal extinction treatment.6.Please Note: This diagonal can only be used with refractor telescopes and some catadioptric telescopes like Schmidt-Cassegrain, Maksutov-Cassegrain, etc. It not meant for use with Newtonian / DOB reflector telescopes or other variants of Newtonian telescopes