On Our Theia 90 Star Diagonal
“The diagonals mirror is of excellent quality, and observational comparison with one or two of my own diagonals gave me no cause to doubt that the 46mm (minor axis) mirror is as stated, one-tenth wave with 99 per cent reflectance.”
“The beauty of this system is that filters can be placed in this primary optical position, doing their task unmoved for any eyepiece or camera changes ‘downwind’.”
“True to its makers’ name, this diagonal is a precisely made piece of astronomical engineering, and I have no hesitation in recommending it.”
On Our Rotating Turret
“First appearances are certainly impressive. Cut from a single block of aircraft grade aluminium, the cage is bathed in a luscious red livery, nicely offset with the silvered nameplate and dark sextet of eyepiece turrets.”
“The turret turns very smoothly indeed; there is no resistance that might impart a motion of misalignment to the telescope itself. When it arrives at an eyepiece position, you can feel the gentlest of engagements as the mechanism reaches its next position.”
“Optically, I was completely unconscious of using anything other than a high-quality star diagonal, save for the multifaceted arsenal at my immediate disposal – with just a turn of the turret. This is a nicely engineered facility that will save time and effort that can instead be poured into the act of observation, which is what it is all about.”
Review details here
