What is the advantage of a dielectric diagonal like the DS2MD 2.0"?
The primary advantages are higher light transmission and increased durability. Dielectric coatings reflect more light than standard aluminum coatings, leading to brighter images at the eyepiece. They are also much harder and more resistant to scratching and environmental degradation, ensuring a long service life.
When should I use a 2-inch diagonal like the DS2MD?
A 2-inch diagonal is necessary when you want to use 2-inch eyepieces, which are required for achieving the widest possible true fields of view. This is especially beneficial for observing large objects like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in long focal length telescopes like SCTs and refractors.
Is the DS2MD 2.0" Diagonal compatible with my SCT?
Yes, the DS2MD 2.0" Diagonal is compatible with any Schmidt-Cassegrain, Maksutov-Cassegrain, or refractor telescope that is equipped with a 2-inch focuser or a 2-inch visual back. The diagonal's nosepiece inserts directly into the focuser, and your 2-inch eyepiece then inserts into the diagonal.
Why choose a mirror diagonal over a prism diagonal for the DS2MD?
Mirror diagonals like the DS2MD are generally preferred for all telescope types, especially reflectors and large SCTs, because they introduce no chromatic aberration. While high-quality prism diagonals can perform well in refractors, a dielectric mirror provides consistently high reflectivity across all wavelengths and avoids potential optical issues, making it a more universal choice for critical observing.
Does the DS2MD 2.0" Diagonal come with adapters?
Based on the available information, this product includes the 2.0" diagonal itself. A separate 2" to 1.25" adapter would be required to use 1.25" eyepieces. Please check the "In the Box" tab for a complete list of included items.
Will the DS2MD 2.0" Diagonal reach focus in my Newtonian reflector?
No. Diagonals like this are designed for refractors and catadioptric telescopes (SCTs, Maks). Newtonian reflectors typically do not have enough focuser "in-travel" to reach focus with a star diagonal, as their optical design already includes a secondary mirror that directs light out the side of the tube.
