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All metal, knockdown-style 6” f/5 travel Newtonian co-produced by RP-Astro (Italy) and Kasai. Becomes a compact octagonal box by jointing the secondary cage and the primary cell, fitting into a suitcase or a travel bag. 3kg lightweight OTA can load onto a photo tripod, and even “hand-held” observing is possible. 2” helical focuser accepts widefield low-power eyepieces for deep-sky observations, while thin vane spiders and small central obstruction ensure good performance for planetary observations. 3-step back and forth fixing function of the secondary cage enables the back focus adjustment. 3-angle rotatable secondary cage to fit the observer’s dominant eye and the mounting types. Many other unique ideas for travelling observers are incorporated. Cool Italian design and good finish are also attractive.
ZINGARO-6
ZINGARO-6 disassembled
ZINGARO-6 transport form
<Development Concept>
“Shall we make a maximum aperture telescope that can fit into a suitcase or a travel bag?” – This suggestion by Kasai to RP-Astro lead the co-production of Zingaro-6.

Talking about observing instruments which can be brought with travelling luggage, small binoculars or 60mm-80mm small refractors are chosen so far. Of course good quality small refractors will yield nice images of the moon or planets. However, considering the fact that the main purpose during the travel is usually deep-sky observation, the light gathering power is apparently too small with such copact refractors. Yet, if trying to bring a large enough aperture telescope, it becomes impossible to fit it into a suitcase or a travel bag, and the number of luggage should be increased. Especially when travelling by air, you should have to be so nervous about the rough treatment of your check-in luggage. It would be still okay in serious observing expeditions, but it’s a troublesome choice in usual sightseeing tours. After all, the conclusion tends to be, “Let’s bring only small binoculars….”

The developing concept of Zingaro-6 was very clear - to make a telescope combining three factors to overcome the situation mentioned above – “large enough aperture for deep-sky observations”, “compact enough to fit into travel luggage” and “solid enough not to be broken with rough treatment”. The basic outline of the scope and some components (optics, focuser, etc.) were supplied by Kasai. The detailed designing of each part and the manufacturing were done by RP-Astro. And then, through our co-production, Zingaro-6 was born in late autumn of 2011. (“Zingaro” means “Gypsy” in Italian, named after an exotic musical instrument affectionately carried by gypsy band travelling over the provinces.)
<Optics>
Precision GSO primary mirror is installed. High homogeneity BK7 optical glass material. Each primary mirror is individually tested with ZYGO interferometer, assuring high quality as within 1/6-lambda on peak-to-valley wavefront, and 1/30-lambda RMS. The certificate with interferometric photo is provided. 93% enhanced coating brings clear images with little scattered light. The center mark is dotted to ease the collimation. 27.3% small central obstruction contributes high definition, exerting high performance in observing faint figures on planets. All the side & back surfaces of both the mirrors are mat-black painted. (“DX” version with a higher quality primary mirror is available - see below.)
<Primary & Secondary Cells> ZINGARO-6 promary cell
To assure lightweight and compactness, the primary mirror is 3-point glued to the cell plate. Strong adhesive with high elasticity prevents deforming of the mirror surface by temperature changes, maintaining good optical performance anytime. Besides, enough room is kept between the mirror backside and the cell plate to quicken the thermal acclimation. Primary mirror cell is equipped with push-pull thumbscrews, helping the collimation works with no tools. The offset secondary mirror is also 3-point glued to the cell plate, held with 1mm thin 4-vane spiders.
<Secondary Cage & Focuser>
Regular octagonal pillar shaped secondary cage consists of 2mm thick durable aluminum alloy plates, with 2 baffle rings for reinforcing the cage and eliminating the stray lights. This cage can be rotated and fixed in each 90-degree angle. When mounted onto a photo tripod or a fork mount, horizontal focuser position is useful. And, when mounted onto a T-shaped altazimuth mount or a german equatorial mount, diagonal focuser position is easy to observe. Besides, depending on the observer’s dominant eye, horizontal focuser position can be switched to the other side. To complement this rotary function, the screw holes for finder bases are positioned on both upper and lower side of the focuser, assuring the finderscope is not placed under the focuser. Also the cage can be fixed in 3-step forward and backward. This function enables the back focus adjustment to reach the focus with all your eyepieces. 35mm travel smooth 2” helical focuser comes with a 1.25” adapter (w/M48 filter threads.) Brass compression rings in both the eyepiece adapters.
ZINGARO-6 rotatable topring ZINGARO-6 rotatable topring ZINGARO-6 rotatable topring ZINGARO-6 topring features
<Joint Bar & Baseplate>
The absolute requirement for the joint bar is solidity. Considering the portability, however, heavy or bulky material must be avoided. To solve this conflict contradiction, very sturdy but quite lightweight aluminum alloy special angle frame bars are chosen. As for the contraction method for transport, not a normal sliding system which may cause backlash or bending, but a simpler folding system is adopted. The weight of the joint bar is only 830g, yet it keeps the parallelism between the secondary cage and the primary cell, not causing backlash or bending even when a heavy eyepiece is used. The base plate to fit the mount is 6mm thick aluminum alloy, with two 1/4” (35mm distance) and one 3/8” threaded holes to fit photo/video tripods and dovetail plates (optional) to fit various mass-market mountings.
ZINGARO-6 column structure ZINGARO-6 mounting base
<Portability & Durability>
The major feature of this scope is to become a compact octagonal pillar when the secondary cage and the primary cell are jointed together. Adding the metal dustcover (standard accessory), it becomes a sealed box with the optics housed completely. 190mm x 190mm x 105mm compact box can fit into a normal suitcase or a travel bag. As both the optics are protected with surrounded sturdy metal plates, even rough treatments won’t make any damages on the optical surfaces. The joint bar becomes a 380mm x 80mm x 30mm thin plate when folded, fitting into the bottom in a travel bag or the narrow gap inside a suitcase. As the total weight is only 3kg, no need to care about excessive weight when the luggage is checked in. You have only to bring Zingaro-6, eyepieces and a photo tripod, then you can enjoy deep-sky viewings with 6” light gathering power. (If your luggage should have no room for a tripod, “hand-held” observation is also possible with a guitar strap - see below). Thanks to the simple construction, it takes only a minute for assembling & disassembling. This distinguished mobility is one of the important advantages of Zingaro’s. The size after folded is like a little large dictionary or a yellow page, so it can be stored in a bookshelf together with other books. This extreme compactness is one of the important advantages, too.
<General Aptitude>
Travelling overseas is a good chance to see unknown deep-sky objects. Even travelling within your country, if the sky is dark and clear, it’s natural to have a feeling to observe deep-sky objects with not so a small aperture telescope. In such cases, you have only to throw Zingaro-6 into your travel bag, then you can enjoy beautiful skies with a 6” aperture at any time. It’s so compact as stored in a bookshelf, so you can see the skies at your balcony whenever you want to, just taking out the scope from you bookshelf. This “book-sized” scope will surely bring a lot of fun for both in your travels and home observations.
A premium version with a “research-grade” high-quality primary mirror of Orion-Optics UK is installed, assuring top performance within 1/8-lambda on peak-to-valley wavefront and 1/50-lambda RMS. The individual certificate of interferometric test report is provided. 97% reflectivity “Hi-Lux” coating yields very clear and high-contrast images. Low-expansion “Suprax” (Schott, Germany) glass material. The total telescope weight is 200g lighter than the normal model. All the other mechanical features are the same.
ORION-OPTICS Research-Grade Zygo Interferometric Test Result Sample (Click to enlarge)
Clear Aperture 150mm
Focal Length 750mm
Focal Ratio F5
Central Obstruction 41mm
Obstruction Rate in Diameter 27.3%
Obstruction Rate in Area 7.45%
Max. Tube Diameter 190mm
Tube Length 640mm
Max. Dimension when knockdowned Secondary Cage + Primary Cell: 190mm x 190mm (250mm incl. focuser) x 105mm
Joint Bar: 380mm x 80mm x 25mm
Weight 3kg (Secondary Cage 0.72kg + Joint Bar 0.83kg + Primary Cell 1.45kg)
DX 2.8kg (Secondary Cage 0.72kg + Joint Bar 0.83kg + Primary Cell 1.25kg)
Focsuing Mechanism 2" Rotary Helical Focuser
Other Features *Primary & Secondary Collimation Functions
*3-angle Rotary & 3-step Back&Forth Fixing Function of Secondary Cage
*Baseplate to fit Photo Tipods & Telescope Mounts
(1/4-20 threads x 2 + 3/8-16 threads x 1)
Standard Accessories Metal Dustcover
2"/1.25" Eyepiece Adapter (w/M48 Filter Threads)
Interferometric Test Report of the Primay Mirror


All metal, knockdown-style 8” f/5 travel Newtonian co-produced by RP-Astro (Italy) and Kasai. Most features are inherited from Zingaro-6, and the aperture is 2” larger. Due to the weight increase of the primary mirror, one more reinforcing plate is added under the joint bar to prevent bending. While keeping the simple structure, good collimation condition can be maintained. Let alone it’s Ideal for deep-sky observations, 23% small central obstruction and 1mm thin vane spiders contribute planets & moon observations. The total weight is only 4.8kg. Very thin design of just 12.5cm thickness when folded. It can fit into a normal suitcase, and you can bring a high quality 8” large telescope to anywhere freely. (The detailed feature are mostly the same as Zingaro-6. See above.)
ZINGARO-8
Clear Aperture 200mm
Focal Length 1000mm
Focal Ratio F5
Central Obstruction 46.5mm
Obstruction Rate in Diameter 23.25%
Obstruction Rate in Area 5.4%
Max. Tube Diameter 242mm
Tube Length 890mm
Max. Dimension when knockdowned Secondary Cage + Primary Cell: 240mm x 240mm (300mm incl. focuser) x 125mm
Joint Bar: 505mm x 80mm x 25mm
Weight 4.8kg (Secondary Cage 1kg + Joint Bar 1.1kg + Primary Cell 2.7kg)
Focsuing Mechanism 2" Rotary Helical Focuser
Other Features *Primary & Secondary Collimation Functions
*3-angle Rotary & 3-step Back&Forth Fixing Function of Secondary Cage
*Baseplate to fit Photo Tipods & Telescope Mounts
(1/4-20 threads x 2 + 3/8-16 threads x 1)
Standard Accessories Metal Dustcover
2"/1.25" Eyepiece Adapter (w/M48 Filter Threads)
Interferometric Test Report of the Primay Mirror
★ Optional Components for ZINGARO-6/8 ★
<6×30mm Finderscope> ¥6,000
Glossy-black finished 6x30mm multi-coated achromat finderscope. 8-degree field of view with crosshair reticle. Comes with a detacheable bracket & a dovetail base.
6x30mm finderscope
<Light Shroud>
for ZINGARO-6 ¥9,800 / for ZINGARO-8 ¥12,800
Tube-shaped light shroud covering all the hollow part of Zingaro to shield the stray lights. Special design allows the scope to be put on a tripod/mount with wearing it. Hand-made by Italian tailors, using elastic & lightproof Italian black fabric.
Anti-Light Shroud
<Finder Base> ¥1,200
A finder base to acceDovetail Base for Finderscopept Vixen, Synta, GSO and many other branded finder brackets. (Pre-installed if ordered together with Zingaro.)
<Dovetail Plate>

Dovetail Plate
Vixen-compatible dovetail plate to fit various mass-market mountings. 150mm & 200mm lengths are available. Comes with 1/4"-20 fastening bolts x 2.

<Hand-Held Observation>
Too much luggage and have no room for a tripod? Or, is it tiresome to take out a heavy mounting to the balcony? In such cases, you can try an easy "hand-held" observation with Zingaro-6. Just get an electric guitar strap ("Gibson" is recommended) and connect either end to the secondary cage fixing screw and the primary mirror fixing screw, then rest it on your shoulder. You can use up to 30x - 50x in good stability, better than you've imagined.
ZINGARO-6 w/guiter strap ZINGARO-6 hand-held observing
Kasai Trading Co., Ltd.
5-19-33, Kami-Meguro, Meguro-Ku, Tokyo 153-0051, JAPAN

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