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Takahashi TOA-130NFB 5.1" Ortho-Apochromat Triplet Refractor OTA
$8,110.00This performance of this 4" focuser Takahashi 5.1" ED triplet refractor is too good to let it be called simply an apochromatic scope. Only the term ortho-apochromatic is accurate enough to describe its optical excellence, both visually and for medium format and 35mm/large format CCD imaging . . . -
Sky-Watcher Esprit 150mm f/7 ED apochromatic triplet refractor with field flattener
$8,250.00The big Sky-Watcher Esprit 150mm ED apochromatic triplet refractor with thread-on field flattener combines premium high contrast/high resolution imaging performance with the flat field you need for critical imaging. It's a superb 6" apo refractor that can be the heart of your observing and wide field imaging system for years to come. -
Astro-Tech AT150EDL Refractor OTA FCD-100 and Lanthanum f/8 Doublet with Hard Case
$2,995.00The Astro-Tech AT150EDL takes the performance of the it smaller siblings and combines it with the mechanics of the EDT line.