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TeleVue AP 127/660 TVNP127is OTA Specs
| Brand | TeleVue Optics |
| Full Model Code | TeleVue AP 127/660 TVNP127is Imaging System Nagler-Petzval Apochromatic Refractor Optical Tube Assembly |
| Country of Origin | United States of America (Manufactured) |
| Optical Design | Apochromatic Astrograph (4-Element Dual-Doublet Nagler-Petzval Refractor Configuration with flat-field output alignment) |
| Aperture | 127 mm (5.00 inches) |
| Focal Length | 660 mm |
| Focal Ratio | f/5.20 |
| Optical Coatings | Proprietary TeleVue High-Transmission Multi-Coated Matrix layers yielding exceptional throughput thresholds |
| Glass Material | Premium USA-sourced and custom imported Extra-Low Dispersion Optical Glass Doublet sets matched for color-free tracking metrics |
| Secondary Mirror Obstruction | 0 mm (Unobstructed Optical Path Setup) |
| Secondary Mirror Obstruction by Diameter | 0% |
| Secondary Mirror Obstruction by Area | 0% |
| Resolving Power | 0.91 Arcseconds (Dawes), 1.09 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 12.3 |
| Highest Useful Magnification | 300x |
| Lowest Useful Magnification | 18x |
| Optical Tube Material | Premium Powder-Coated Aluminum Main Tube fitted with high-density internal matte-black flocking for stray-light suppression |
| Focuser Style & Mechanism | Heavy-Duty Geared Pinion Focuser Assembly featuring a 3-inch entrance aperture, 2.4-inch exit aperture, 10:1 Focusmate dual-speed micro-focus block, and integrated tilt-compensation alignment ring |
| Mirror Lock Mechanism | No (Equipped with non-marring structural brass clamp ring with dual locking knobs) |
| Optical Tube Dimensions | 135 mm x 851 mm (Tube Outer Diameter x Fixed Running Total Length Profile) |
| Optical Tube Weight | 6.58 kg (14.50 lbs) (Bare Optical Tube Assembly configuration weight) |
| Mount Attachment Type | Dedicated CNC Mounting Block base plates configured for TeleVue tube ring attachment loops |
| Finder Scope Specification | Accessory channel tracks accepting quick-release TeleVue Sol-Searcher or traditional finder shoe modules |
| Included Accessories | 127mm Nagler-Petzval Objective Matrix, Sliding Metal Dew Shield, 2.4-inch Imaging System Focuser, Screw-on Metal Lens Cover, Hard-Shell Carry Case |
| Standard Warranty | 5-Year Manufacturer Warranty |
| Application | Elite wide-field deep-sky astrophotography and large-format imaging campaigns, leveraging a flat-field dual-doublet array to maintain sharp pinpoint tracking without external corrective blocks. |
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