News

ATT Volume 12 Issue 5
Issues

ATT Volume 12 Issue 5

In this issue Barry Simon demonstrates how to make an ATM exit pupil gauge; Dr. James Dire explains why he is so enamored with the Explore Scientific 68° and 82° degree eyepieces; Mark Harmston provides an overview of how he imaged Comet 21P/Giacobini-Zinner; Greg Crinklaw walks through imaging with Skytools […]

Orion Telescopes & Binoculars 1.25-inch Pentaprism Diagonal
News

Orion Telescopes & Binoculars 1.25-inch Pentaprism Diagonal

The Orion Pentaprism 90-Degree Diagonal ($199.99US) is a non-inverting, non-reversing 1.25-inch diagonal. Unlike typical star diagonals, it does not produce a mirror-reversed image, which can make navigation and referring to star maps difficult while observing with your telescope. But unlike common correct-image diagonals, there is no image degradation caused by […]