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Astro-Physics Stowaway 92 F/6.65 apochromatic refractor with 2.5" FeatherTouch focuser




Astro-Physics Stowaway 92 F/6.65 apochromatic refractor with 2.5" FeatherTouch focuser. Diameter 92 mm, focal length 612 mm (F/6.65). Air-spaced triplet apochromat with Hoya FCD-100 central lens. Machined aluminium tube, fully baffled, with flat black interior and engraved retaining ring. FeatherTouch FTF2535 focuser with Feather Touch Micro 9:1 dual-speed reduction.

Out of stock, waiting for the next production run. It is not possible to place an order, however you can add your name to the waiting list.

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Astro-Physics Stowaway 92 F/6.65 apochromatic refractor with 2.5" FeatherTouch focuser

Astro-Physics introduced the redesigned Stowaway at the Northeast Astro-Imaging Conference on April 18, 2018. Long-time astronomers will recall that Astro-Physics offered f5 and f7 Stowaway refractors from 1999-2002 that are cherished today for their portability and performance.

This triplet lens scope has the same extraordinary quality that you have come to expect from Astro-Physics with a few new exciting features:

  • Grab ‘n go visual travel companion. Follow eclipses around the globe or observe wildlife from afar!
  • Dramatic deep-sky imaging with its optional Prime Focus Field Flattener. For chips smaller than 12mm, no field flattener is required.
  • Silky, smooth 2.5” Starlight Instruments Feather Touch focuser with dual-speed mechanism. The dual-speed feature is particularly advantageous for critically focusing this fast focal ratio. A digital focusing system is available for imaging.
  • Rotating focuser enables you to frame your photos for optimal, artistic composition.
  • Compact, lightweight tube assembly travels easily in its Pelican Air case.
  • Fully retractable, felt-lined dew shield slides to its fully-extended position and then secures in place.
  • Latest multi-coating technology will provide optimum light transmission.

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 correctionLess than +/- 0.003% focus variation from 656 nm to 436 nm (c to g wavelengths).
Clear aperture92 mm (3.62”)
Focal length612 mm (24.1”); Backfocus of 160 mm (6.3”)
Focal ratiof/6.65
Theoretical Resolution1.1 arc seconds
CoatingsMulti-layer, broadband, overall transmission greater than 97% in peak visual wavelengths
Magnification range18x to 360x
Tube assemblyCream white, 3.62” diameter, machined aluminum tube, fully baffled, flat black interior, engraved retaining ring.
Focuser type2.5” I.D. Starlight Instruments FeatherTouch 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 length19.5” (495 mm) with dew shield fully retracted; 21.75” (553 mm) with dew shield fully extended.
Diameter of dew shield4.4” (112 mm) OD, retractable
Weight with dew shield7.1 lb. (3.2 kg)
Carrying casePelican Air 1525 with TrekPak Dividers

Photographic Field

Photographic field with dedicated Field FlattenerUnvignetted 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 CorrectorUnvignetted 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
Covers APS format
Focal ratio: f/13 @ 90 mm backfocus

Stowaway - What's Included?

  • Tube Assembly with 2.5" FeatherTouch Focuser, Dew Shield and Dustcover
  • 2" and 1.25" Adapters
  • Mounting Rings and V-Style Dovetail Bar
  • Pelican Air 1525 Carrying Case with TrekPak Dividers

Out of stock, waiting for the next production run. It is not possible to place an order, however you can add your name to the waiting list.

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