Celestron omni xlt 102mm refractor telescope10/21/2023 The poor optical quality of the prism itself hurts the quality of the image, and the prism is too small, so that the edges of the field of view are slightly darkened when using the 25mm Plossl eyepiece that comes with the kit. In the case of the unit that comes with the kit, the plastic body and low-quality coatings cause more internal reflections. Not only is such a feature completely unnecessary, but the Amici design causes more glare and a bright diffraction spike on many targets. This diagonal produces an image that is corrected for left-right orientation rather than being flipped like a mirror, as is the case with an astronomical star diagonal. The Celestron Omni XLT 102AZ, like many beginner telescopes sold by Celestron, comes with a 1.25″ Amici prism diagonal, which is designed for terrestrial viewing. You could purchase tube rings to allow the use of 2” accessories with the Omni XLT 102AZ if you wish, but between the rings, a 2” diagonal, and 2” eyepieces, you’d likely spend more than the telescope itself costs just on those upgrades. The focuser is also not as sturdy as is generally warranted for using 2” oculars anyway, and the mount would be best without having additional weight placed on it. However, the telescope will not balance on a mount with a 2″ diagonal and eyepieces the XLT 102AZ lacks a long dovetail bar or tube rings to allow it to slide along in the mount saddle to compensate for the rear-heaviness of a 2” diagonal and eyepieces. The Omni XLT 102AZ is equipped with a 2″ all-metal rack-and-pinion focuser, which is able to handle even fairly heavy 1.25″ eyepieces. It still displays fairly pleasing views but runs out of steam at above 100x, and fine planetary detail is somewhat obscured. As a result, the Omni XLT 102AZ shows purple halos of chromatic aberration on bright targets like the Moon and planets and is noticeably softer at higher magnifications compared to other telescope designs or a longer focal ratio achromatic refractor. The achromatic design of the XLT 102AZ, which uses two lenses made of different glass types to control chromatic aberration, is insufficient to fully eliminate this issue at a focal ratio of f/6.5. The Omni XLT 102AZ is no exception, and it will show significant chromatic aberration on bright targets. As refractors get larger in aperture and faster in focal ratio, they tend to exhibit more chromatic aberration.
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