92 mm f/6.65 Stowaway on Mach1GTO Mount
Astro-Physics introduced the redesigned Stowaway at the Northeast Astro-Imaging Conference on April 18, 2018. Long-time astronomers will recall that we offered f5 and f7 Stowaway refractors from 1999-2002 that are cherished today for their portability and performance. Indeed, our own Stowaway has traveled with us to star-gaze in far off places as well as to watch whales, boats, birds and other wildlife. While observing the solar eclipse in August 2017 from Wyoming, we had so much fun with our original 92 mm Stowaways that we decided to make another production run.
This triplet lens scope has the same extraordinary quality that you have come to expect from Astro-Physics with a few new exciting features:
The Mach1GTO German Equatorial mount is recommended for visual observation or astro-imaging. The unique quick-and-easy daytime polar-alignment routine makes it ideal when setting up for star parties and public outreach. The intuitive GoTo Keypad serves as a full-featured mini-computer or use a planetarium program on your PC or Mac computer. You can even control the basic functions of the mount with your mobile smart device.
Optical Design
The air-spaced 3-element lens has broad band
multi-coatings on all surfaces. The design was made using the latest version
of the ATMOS lens design program. Optimization was chosen for the polychromatic
Strehl ratio to be above 90% for the entire visual spectrum with a peak value
of 99.8% at the visual peak. The result is unprecedented color correction.
Visually the scope shows sharp contrasty images without color fringing with
well-corrected high-power oculars.
The custom field flattener design achieves wide band color correction that extends into the violet regions with diffraction-limited performance designed for the most demanding modern astronomical cameras. This is especially important for the latest CMOS chips which have their highest sensitivities in the violet part of the spectrum and will show large blue halos with lesser optical designs. The 92 mm with dedicated field flattener produces sharp images at all wavelengths without blue halos or bloated stars.
| Color correction | Less than +/- 0.003% focus variation from 656 nm to 436 nm (c to g wavelengths). |
| Clear aperture | 92 mm (3.62”) |
| Focal length | 612 mm (24.1”); Backfocus of 160 mm (6.3”) |
| Focal ratio | f/6.65 |
| Theoretical Resolution | 1.1 arc seconds |
| Coatings | Multi-layer, broadband, overall transmission greater than 97% in peak visual wavelengths |
| Magnification range | 18x to 360x |
| Tube assembly | Cream white, 3.62” diameter, machined aluminum tube, fully baffled, flat black interior, engraved retaining ring. |
| Focuser type | 2.5” I.D. Focuser with rotating collar, rack and pinion, Feather Touch Micro 9:1 dual-speed reduction, 3.5” travel. Focuser drawtube features millimeter focusing scale. 2” and 1.25” adapters included. |
| Telescope length | 19.5” (495 mm) with dew shield fully retracted; 21.75” (553 mm) with dew shield fully extended. |
| Diameter of dew shield | 4.4” (112 mm) OD, retractable |
| Weight with dew shield | 7.1 lb. (3.2 kg) |
| Carrying case | Pelican Air 1525 with TrekPak Dividers |
| Photographic field with dedicated Field Flattener |
Unvignetted image circle: 50 mm diameter 35 mm format: 3.2 x 2.2 degrees Focal ratio: f/7 Focal length: 644 mm |
| Photographic field with 0.8x Telecompressor Corrector |
Unvignetted image circle: 40 mm diameter 35 mm format: 4.2 x 2.9 degrees Focal ratio: f/5.3 Focal length: 488 mm |
| Photographic field with 2x Barlow |
Image circle: 32 mm diameter, 1.2 degrees |
Price and Delivery Information
Price: To be determinedDelivery: The 92mm Stowaway is not available immediately and the notification list is now closed due to the very high demand for this scope. We are not accepting additional names at this time. Price and delivery information will be available later in 2018.
Stowaway - What's Included?There are many other accessories to consider. Please refer to these sections for additional recommendations:
Visual Accessories
Photographic
and CCD Imaging Accessories
Baader Planetarium Filters
Specifications subject to change without notice.
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reserved.
Last modified:
September 8, 2018
Astro-Physics, Inc.
11250 Forest Hills Road, Machesney Park, IL 61115, U.S.A.
Phone: 815-282-1513 Fax: 815-282-9847