Delivery: 1 weeks
It has a superb chromatic and spherical correction. Try any power and any longitudinal focus position, you will detect no false color. Perform a star test, you will discover textbook perfect diffraction patterns in and on either side of focus as described in the book Startesting Astronomical Telescopes, by Harald Richard Suiter. Use a 2" wide field eyepiece with maximum possible field stop and get an unbelievable FOV of 5.6 degrees, larger than most 50 mm finders. For wide field imaging with larger CCD and/or 35 mm and Digital SLR cameras we advise using the TS 2" flattener for the best possible results. The tube design is a modular system for the most compact transportable size. The dew shield with its front screwed on knife edge baffle (to protect the lens from dew) can be fully retracted. The main tube is made of two parts, unscrew the rear part and you are able to use a binoviewer for low power wide field observing without the need of a barlow lens or optical path corrector. For the 2" focuser we use perhaps the world's best - Starlight Instruments Feather Touch with brass compression ring and internal brake. This focuser has a high loading capacity, can be locked and offers a 1:10 fine focusing mechanism. The tube ring offers two bottom-tapped 1/4-20 inch holes along the tube line with center to center spacing of 35 mm (1.378"). This allows it to easily mount to either a photo tripod head or a stable mount rail. On top of the tube ring we added threads to attach the TeleVue 50mm finder bracket, or TeleVue Starpointer or Starbeam or Sol-Searcher finder. Technical Datas: • Tube outside diameter: 89mm = 3.46 inch • Dew shield outside diameter: 4.28 inch • Length of tube with extended dew shield and installed extension: 16.53 inch • Length of tube with extented dew Shield and no tube extender for binoviewer observing: 12.79 inch • Length of tube with retracted dew shield and installed tube extension: 14.17 inch • Length of tube with retracted dew shield and no tube extender (shortest length): 10.43 inch • Internal protection against reflections: Two knife edge baffles inside the tube, one knife edge baffle in front of dew shield plus black foam • Weight - Optical tube with extension and tube ring: 6.05 pounds • Weight - Optical tube without extension plus tube ring: 5.61 pounds • Weight - Optical tube without extension and without tube ring: 5.06 pounds • Threads on Tubes and Extension M95 x 1 • Feather Touch Focuser 2" • Back-focus is optimized for use of 2" star diagonal in combination with Baader/AP binoviewer without optical path corrector using any eyepieces • Back-focus with focuser racked fully in and installed tube extension: 5.92 inch • Back-focus with focuser racked fully in without extension: 9.8 inch Delivered with order: • Triplet SuperED-Apo Lens D=80 mm f=500 mm • fully multicoated • CNC Aluminium Tube • 2" Starlight Instrument Feather Touch Focuser • movable Dewcape • movable Extensiontube for bino using • Tuberings • Alu-Transportcase Model: APM 80/500 CNC en Aperture: 80 mm Focal length: 500 mm F/ ratio: f/6.25