Quartz Dielectric Star Diagonal - 2" - D1040Q-TL

. The Stellarvue diagonal D1040Q was received very well packed for safe arrival. It came with an excellent adapter to allow the use of both 11/4" & 2" eyepieces. It comes with an instruction booklet. Evaluated using my Stellarvue SV115T20 apochromat. The diagonal is sturdily built and very high quality. Straight through performance with eyepiece versus eyepiece + diagonal indicated no loss of performance either in brightness or sharpness of image, high contrast levels retained. Eyepieces used FUJIYAMA HD-OR25mm; PENTAX 20mm & ED5.2mm. The jewel box and Jupiter were used in the evaluation. Air temp 10 degrees C. Jupiter showed a wealth of detail including the giant red spot and 4 jovian moons,as tiny orbs. The jewel box was ultra sharp with the individual colour of the stars of this compact cluster very clear and distinct with beautiful contrast. I can highly recommend the Stellarvue D1040Q for those individuals seeking a no compromise diagonal for use with the highest quality instruments and eyepieces.