A thread-on step down ring takes the opening down for 2-inch accessories. The micro focuser allows you to make strong and fine adjustments to focus, and the knobs are easy to turn, even with cold hands or with gloves on. The Helinear Track Focusing System, a Sky-Watcher exclusive, is a rock-solid 2.7-inch rack and pinion focuser that will perform smoothly, without image shift, due to the extra support rail on the top of the drawtube. The shield is fully retractable when necessary in order to shorten your OTA for storage and travel. The Dew Shield, when extended, will protect the optics from dew and help increase contrast by blocking stray light that might otherwise strike the glass. Use it as a giant lens to capture the Universe with one of today’s amazing CCD cameras. This system produces a 40 mm image circle, and you have about 69 mm of back focus for plenty of imaging accessories. Three-element apochromatic objective with an included thread-on field flattener to the oversized micro-focuser. The air-spaced ED APO Optics are fully multi-coated for extra clarity, contrast, and protection. The included two-element field corrector guarantees a flat field across the entire imaging plane giving you brighter images. Its three-element air spaced objective lens design, fully removes false color giving you prime contrast and sharpness. Technically, a 100mm Newtonian could be approximately equal to an 80mm refractor - But it would have to be parabolic - Many smaller telescopes (Up to 150mm) are NOT parabolic and this detracts enormously from the quality of the image, giving very poor results on instruments with a focal ratio of less than f8. If you don't like the CA you could mask down the 100 to 90 with an aperture mask. The Sky-Watcher 100mm Esprit ED Triplet APO Refractor was designed with astro-imagers in mind that are eager to develop their astrophotography skills. The Lunt 100MT is a Triplet ED APO Refractor, offering a FPL53 Objective Lens for stellar, and truly out of this world, views. For Achro refractors at the same focal ratio the the 100 will exhibit more chromatic abberation (CA) and be a little.
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