The Sky-Watcher Esprit line of high-quality ED Triplet APO refractors will perform flawlessly whether you enjoy it as a visual instrument or use it as a giant lens to image the Universe with one of today's amazing CCD cameras. The designers of this telescope line concentrated on the desires and requirements of the avid astro-imager, from a three-element apochromatic objective with included thread-on field flattener to the beefy oversized micro-focuser. The air-spaced ED APO optics are fully multi-coated for extra clarity, contrast, and protection, and the two-element corrector, which comes standard with the Sky-Watcher Esprit, will ensure a flat field across the entire focal plane. This system produces a 43mm image circle, and you have about 75mm of back focus for plenty of imaging accessories. 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. However, the shield is fully retractable when necessary in order to shorten your OTA for storage and travel The Helinear Track Focusing System, a Sky-Watcher exclusive, is a rock-solid 3.4" rack & pinion focuser that will perform smoothly, without image shift, due to the extra support rail on the top of the drawtube. The micro focuser allows you to make course and fine adjustments to focus, and the knobs are easy to turn, even with cold hands or with gloves on. A thread-on step down ring takes the opening down for 2" accessories, and a 2" to 1.25" adapter is included in the package. Accessories are a big part of any telescope system, and Sky-Watcher wants to make sure that you start out right. Included with every Esprit refractor is a 2" dielectric diagonal, a 9 x 50 RA erect-image finderscope and bracket, a Canon camera adapter, tube rings with a CGE ("D" style) dovetail bar, and an aluminum foam-lined case.
Sky-Watcher Esprit ED APO Triplet Refractors...
- Additional Information
SKU SW-S11420 UPC Code 50234114202 Manufacturer Sky-Watcher Telescope Series Sky-Watcher Esprit Optical Design Refractor - Apochromatic Mount Type None - Optical Tube Only Telescope Aperture 4.7" Telescope Focal Length 840mm Telescope Focal Ratio f/7 Highest Useful Magnification 283x Limiting Stellar Magnitude 12.9 Optical Coatings Fully Multi-Coated Dew Shield Included? Yes Length of Optical Tube 31.5" Extended, 27.4" Retracted Optical Tube Weight 22 lb. Tube Color or Finish Gloss White Finder Included 9 x 50 Optical Finder Alignment Procedure N/A
- Included Items
- Sky-Watcher 4.7" f/7 ED Triplet APO Refractor
- Thread-on Field Flattener
- 3.4" Rack & Pinion Microfocuser
- 3.4" to 2" Thread on Adapter
- 2" to 1.25" Adapter
- 2" Diagonal
- Canon Camera Adapter
- Tube Rings with "D" Series Dovetail Bar
- Aluminum Case
- Questions & Answers
Product QuestionsWhat adapters are required to use a Starlight Xpress SXVR-M25c camera (back focus 17.5mm) with this field flattener?
Are these adapters available from OPT?Question by: Jim on Jan 28, 2016 8:34:00 AMThe included field flattener ends in a machined M48 thread adapter with a back focus from there to the focal plane of 55mm +/- 2mm. The CCD camera you have takes up 17.5mm of that, leaving approximately 27.5mm needing to be made up, and at least one of those adapters needs to be an M48 to T2 (M42) step down adapter. We carry step down adapters by 2-3 companies and both fixed and variable length M48 and T2 extension tubes, so we can easily find 2-3 adapters that would accomplish this goal. Please contact us with questions and we can quote you on the specific adapters.Answer by: Chris Hendren (Admin) on Feb 1, 2016 5:59:00 PMCan you recommend a good focal reducer to get to maybe f/5.5? I use a TMB LOMO 80 natively at F/6 with a TV 0.8 flattened reducer. Might that work well covering a qsi583?
RonQuestion by: Ron on Jan 11, 2016 6:36:00 PMThere are no focal reducers designed for the Esprit 120, and its native focal length is likely too long for the reducer you are currently using on your TMB LOMO 80. You could try the reducer you have or one of the variable spacing versions from William Optics, but outside of those, I am not sure there are reducers available. The camera you have will do very well at f/7 with the included flattener.Answer by: Chris Hendren on Jan 18, 2016 6:41:00 PM
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