92mm F6.65 Stowaway (92F665)

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Refer to Availability tab below

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 additional production runs, which were shipped in 2018-2020. The response and feedback has been so positive that that we are in production with a fourth run run of this scope for 2021 delivery.

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 Field Flattener (92FF) and Telecompressor Corrector (92TCC).
  • 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 Mach2GTO or Mach1GTO (no longer available) German Equatorial mounts are 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

Roland Christen's air-spaced 3-element lens has broad band multi-coatings on all surfaces. 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 optional field flattener design (92FF) 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. 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 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 dust cap 7.1 lb. (3.2 kg)
Carrying case Pelican Air 1525 with TrekPak Dividers

Specifications subject to change without notice.

Photographic Field

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
Backfocus Spacing: 2.52" (64.1 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
Backfocus Spacing: 2.52" (64.1 mm)
Photographic field with 2x Barlow

Image circle: 32 mm diameter, 1.2 degrees
Covers APS format
Focal ratio: f/13 @ 90 mm backfocus

What's Included?

  • Tube Assembly with Starlight Instruments' 2.5" FeatherTouch Focuser, Dew Shield and Dustcover
  • 2" and 1.25" Adapters
  • Mounting Rings and V-Style Dovetail Bar (SBV08)
  • Pelican Air 1525 Carrying Case with TrekPak Dividers

Items That You Will Need For Your Scope

  • MaxBright 2" Mirror Diagonal (PMDMAX)

Accessories to Consider

  • 2.5" Prime Focus Field Flattener (92FF)
  • 0.8x Telecompressor Corrector (92TCC)
  • Canon EOS Camera Adapter with Large 1.875" Diameter Stainless Steel Bayonet - For 92FF and 92TCC (DSLR25EOS)
  • Nikon Camera Adapter with Large 1.73" Diameter Stainless Steel Bayonet - For 92FF and 92TCC (DSLR25NIK)
  • Focuser Boss II Electronic Focusing Control Kit
  • 10 x 60 Baader Planetarium Vario-Finder with Illuminated Reticle, 45° Erecting Prism, and Quick Release Bracket (1060VQ)
  • 10 x 60 Vario-Finder with Quick Release Guider Bracket Kit (1060VGKIT)
  • 7" V-Style Dovetail Accessory "Saddle for Stowaway (ACSD07)
  • Base for Quick Release Finder Bracket (QRBASEM)
  • Picatinny Male Dovetail Base for Multi-Reticle Finders (PICQRM)
  • 2" Advanced Convertible Barlow (BARADV)
  • Flat Field Converter (BPFFC) Barlow and Related Accessories in the FFC System
  • Baader Mark V Binocular Viewer (BPMARKVS)
  • Baader Cool-Ceramic Safety Herschel Prism (BPHERP)
  • Baader AstroSolar Filters (ASTF-80 or ASSF-100)
  • Kendrick Dew Remover Premier Heater (KDR004)
  • Kendrick Solar Filter for Stowaway with Baader AstroSolar, Density 5-Visual (KS6004-B)
  • 7" Sliding Bar (SB0800) - limited quantity available while they last. For use with DOVE08 Saddle Plate (no longer available).


Unfortunately, the 92mm Stowaway is not available off the shelf for immediate purchase. Over the years, we have maintained a notification list so that we can notify prospective customers when the scope is available to order. 

October 8, 2021 update:

The 92mm Stowaway 2021 Random Drawing Entry form is no longer available because the signup deadline of August 6 at 12pm noon central daylight savings has passed.

What's the status?  We have not sold all of the Stowaways yet and are continuing to contact people.  On August 6th, we drew the first names from the entrants who signed up and sent emails to the addresses provided.  Please be sure to periodically check the email account that you used to sign up so that you do not miss your opportunity. We do not have any other method of contacting you. The notification emails that we send out will have a deadline for you to contact us. We will post periodic messages on this Availability tab of 92mm Stowaway website page regarding the status of the drawing.

Over the coming weeks and months, we will contact the people whose names we draw randomly from the entries. This process may take several months for the following reasons:

  • We will give people a designated period of time to decide if they actually want to purchase the Stowaway.  If they decide not to, we draw more names and contact those people and so on. This is a slow process.
  • We do not sell the final scopes in the run until they are completed just in case we lose some due to breakage (very rare) or there is some other problem with the quality of the glass. 

When would I pay for my order?  The order process will remain the same as usual: Once you’re notified, you will have a designated period of time to decide whether to purchase and submit a 50% deposit.  At that time, a scope will be reserved for you and we will provide an estimated date of delivery.

Good luck to all of you who signed up!!

Some background if you missed earlier posts: 

In July 2021, our fourth production run was well underway and we had contacted all of the remaining people who had signed up on our notification list in April 2018.  Roland had fulfilled his promise of making enough scopes for everyone who signed up the first time that wanted one.  We were producing more scopes that will need a good home. 

After much deliberation we’ve decided to offer the remaining scopes in a random-drawing format.  This is a departure from our usual processes, so we know you have questions.  We have answers:

What do you mean, random drawing?  For one week from Friday, July 30 to Friday, August 6 (12pm noon central daylight savings time), anyone could sign up on the 92mm Stowaway 2021 Random Drawing Entry form on this Availability tab for the 92mm Stowaway.  It did not matter when you signed up, as long as it was within the sign-up window.  From this group of interested people, we will randomly choose the people who will be notified of the opportunity to purchase a 92mm Stowaway.

Why aren’t you just notifying people in order of when they signed up, like usual?  Traditionally we have collected names of those interested in a particular product in chronological order and notified folks of the opportunity to purchase the item in that order.  We’ve occasionally received criticism, most especially if the list is only open for a short time, from folks who were unaware of the list, on vacation, on the other side of the world and asleep when the list was open, etc.

We only have a limited number of Stowaways and wanted to give everyone an equal chance to purchase one.  With advanced notice and a one-week sign-up window, we hoped to catch everyone who might be interested in this scope.




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