A 6-inch Dobsonian reflector telescope is just too big and awkward for some people. Finding the storage space in your home is another issue.

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If you’re looking for a large aperture telescope with a compact design, the Orion StarBlast 6 Astro Reflector Telescope is an excellent alternative. It packs a whopping 6-inch (150mm) aperture primary mirror into an optical tube that fits on a tabletop mount. Its ease of use and portability make the StarBlast 6 a great option for beginners and experienced astronomers alike. OpticsThe optical performance of the StarBlast 6 is an improvement over the 130mm tabletop reflectors reviewed in our article. The seemingly small increase in aperture size to 150mm actually offers 33 percent more light gathering ability resulting in brighter and sharper images. Although the StarBlast 6 does have a large central obstruction compared to longer focal length reflectors with similar sized apertures, the reduction in light due to this obstruction should not be apparent to most people.

The parabolic primary mirror has a focal length of 750mm and a focal ratio of f/5. Using a parabolic primary mirror eliminates spherical aberration common with low-budget reflectors that have spherical primary mirrors.Comatic aberration or coma will be present and is typical of Newtonian reflector telescopes. With coma, stars along the edge of the field of view will have a distorted comet-like tail appearance.

Stars in the center of the field of view are unaffected. This will be noticeable at low magnification for the most part. ValueOne downside is that the StarBlast 6 costs about $70 more than a 6-inch Dobsonian like the, which is arguably better and has a longer focal length. In fact, for an extra $40 you could buy an.

But again, if storage and portability are a major concern than the StarBlast 6 is good replacement. MountThe tabletop Dobsonian base is a simplified altazimuth mount that comes pre-assembled for quick setup.

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The mount rotates 360 degrees and moves up and down with smooth motions. An altitude tension knob can adjust the tension of the up and down movement or lock the optical tube in place. A handy eyepiece rack is built into the side of the mount and can hold 3 eyepieces. Two carrying handles allow for easy portability.The optical tube attaches to the mount with tube rings. The tube rings also allow you to rotate the optical tube to find a preferred eyepiece angle. By adding a dovetail plate to the tube rings, you could attach the optical tube to an altazimuth or equatorial tripod mount.

The front end of the optical tube has a knob that acts as a handle to move the telescope in all directions.The StarBlast 6 is large enough to operate from the ground if you’re mobile enough or comfortable doing so. However, most people will prefer to place the telescope on a sturdy surface like a picnic table, small portable table, stool or crate. FinderThe EZ Finder II is a red dot reflex sight mounted to the optical tube and used to locate the celestial objects you wish to observe. Unlike a finderscope, the battery-powered red dot finder does not provide any magnification. Looking through the finder’s viewing window you will see a projected red LED dot which is used as a guide to move the telescope until the dot is centered on the target object. Don’t forget to turn off the EZ Finder II when you’re not using it to save battery life.EyepiecesThe telescope comes with two 1.25″ Sirius Plossl eyepieces – a 25mm (30x magnification) and a 10mm (75x magnification).

These are good quality eyepieces to get you started but you will likely want to add an additional shorter focal length eyepiece or a Barlow lens to see more lunar and planetary detail. Adding a would give you 188x magnification. A would double the magnification of the included eyepieces to 60x and 150x.

FocuserThe plastic 1.25″ rack and pinion focuser is perhaps the weak point of the StarBlast 6. It’s decent and does the job but it’s pretty basic. This is something you could upgrade in the future but there is also a slight modification you can do yourself. This details how to remove the standard thick grease and replace it with lithium grease for much smoother focusing.

CollimationAs with all reflector telescopes, collimation (periodic adjustment of the mirrors) will be necessary. This will make sure the mirrors are properly aligned for sharp and crisp images. While collimating a telescope may seem difficult at first, it shouldn’t take longer than a minute or two once you get the hang of it. And the StarBlast 6 has some helpful features to make collimation easier.

The primary mirror is center-marked, a simple collimation cap is included and thumbscrews allow you to adjust the primary mirror with just your fingers. You will need a 2mm Allen wrench to adjust the secondary mirror although one is not provided.

ViewsThe StarBlast 6 is a great telescope for viewing the moon, planets and deep-sky objects. You can expect to see the craters of the moon; Jupiter including its 4 moons, cloud bands and Great Red Spot; Saturn’s rings, Cassini Division, and largest moon; Mars as a red disk; Mercury and Venus and their changing phases; Neptune and Uranus as tiny colored disks. Under dark skies, the 6-inch aperture will show plenty of deep-sky objects including galaxies, nebulae, and globular and open star clusters.

DimensionsThe combined weight of the optical tube and mount is 23.5lbs (about 10lbs heavier than a 5-inch tabletop reflector) with a 28-inch long optical tube. Compare this to the which weighs over 10lbs more at 34.4lbs and has a much longer optical tube at 45.5-inches. The StarBlast 6 is too heavy for a child to move and setup on their own.

Teenagers and adults should have no problem carrying the optical tube and mount as one assembled unit or as separate pieces. PushTo VersionOrion also makes a PushTo version of this telescope called the for about $160 more. It comes with a computerized object locator that has a database of thousands of objects. A handheld controller provides arrow directions for you to follow to locate and track an object by manually moving the telescope.

While this is a nice feature, it’s simply not worth the $500 price tag in our opinion.

Nebulosity 4Nebulosity is designed to be a powerful, but simple to use capture and processing application for Windows (7/8/10 32/64 bit) and OS X (10.7-14). A huge array of cameras are supported for capture (see below) and images from just about anything can be processed (support for many FITS formats, PNG, TIFF, JPEG, DSLR RAW files, etc). Its goal is to suit people ranging from the novice imager who wants to create his or her first images to the advanced imager who wants a convenient, flexible capture application for use in the field.

In it, you get a host of purpose-built, powerful tools to make the most out of your images and imaging sessions.Nebulosity 4 (currently version 4.3) is $95. Existing v4 users can or any free of any cost (your v4 license is good for all v4 updates).

Users with a valid version 3 license or users with a valid version 2 license can for $20 and $40 respectively.Nebulosity 4 supports a wide range of cameras on both Windows and OS X with more often being found in. Atik legacy and modern (Mac support is spotty still as there are issues in Atik's Mac library). Canon DIGIC II. / III / 4 / 5 (etc) EOS DSLRs.

Fishcamp Starfish. Meade DSI, DSI Pro, DSI II, DSI II Pro, DSI III and DSI III Pro. QHY 8, 8L, 8Pro, 9, 10, 12.

QSI 500 / 600 series. SBIG. Starlight Xpress USB2 models (SXV / SXVF / SXV-R / Lodestar / etc. Including those converted to USB 2 via the SX adapter). ZWO ASIIn addition, on Windows, the following cameras are supported. ASCOM-5/6 compliant cameras.

Apogee cameras. CCD Labs Q8-HR / Q453, Q285M / QHY2 Pro. FLI cameras.

Moriavian G2/G3 (v3 or higher firmware). Orion StarShoot Deep-Space Color Imager (original). OpticStar DS-335 series, DS-336C, DS-615, DS616, DS-142, DS-145, and PL-130. SAC10. SAC7 / SC1 long-exposure modified webcams / Atik 1 and Atik 2 cameras. Earlier DIGIC I Canons (e.g. The 300D) are not supported.

Also, for the DIGIC II cameras and even some DIGIC III cameras, Canon has declared them 'unsupported' by their Software Development Kit. Most do continue to work, but it is not clear if this will change in the future and this does interact significantly with the OS you're using (e.g., many if not all DIGIC II's are not supported for capture on Windows 7/8 and others have issues in OS X 10.8.5 and higher). This is not something I can control and if you're considering purchasing, please download the fully functional demo to ensure things work on your setup prior to purchasing. The Orion StarShoot II, Pro, and other current 'deep space' ones are not supported directly but are supported via their ASCOM drivers. Their 'Solar system' cameras can work (as they are similar to webcams), but keep in mind Nebulosity is designed for deep-space photography.Purchasing If you're ready to purchase Nebulosity, version 4 is $95. Before you do though, download it and try it out in demo mode.

This will let you see how it works and test it out with your hardware (refunds cannot be readily given for basic functionality issues that can be readily tested in the demo). When you're really ready, purchase of the license code entitles you to free upgrades within that version (e.g., a 4.3 license will get you free upgrades to any 4.x product). Simply download the current version, submit your payment via the PayPal icon below (you do not need a PayPal account - credit cards without PayPal accounts are just fine).

The license code will be automatically e-mailed to you ( please check the e-mail account associated with your PayPal account (or entered in at time of purchase) and ensure that the e-mail was not labeled as SPAM. The code should arrive within minutes).Version 4 (Current)Upgrades to v4from version 2 or 3Windows and OS X Support Nebulosity is a cross-platform application. It runs natively in Windows (Win7-32/64, 8, 10) and in OS X 10.7-10.14 (Intel only - supported PPC processors - was the last to support OS X 10.5). While Nebulosity itself is fully cross-platform, many of the camera drivers required for image capture are not. Under OS X, camera control and image capture is supported for a limited set of cameras (see above).

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Likewise, some cameras (e.g., older Canon DIGIC II DSLRs) are not supported by Canon under Windows 7+. All processing features are currently supported and license codes purchased for the Windows version of Nebulosity will unlock the OS X version as well. You are free to download both Windows and OS X versions and use the same code for each.

Why Nebulosity?People looking at software for astrophotography have a wide range of options, these days. So, you might ask, why Nebulosity?

Nebulosity takes a different approach than many packages. You’ve got a number out there that are trying to be the be-all and end-all package that controls everything from your camera to your dome to your toaster.

As a result, they’re often very large (and therefore tougher to navigate), and very expensive. In general, this doesn’t make for something well-suited to someone just getting going in this hobby. In addition though, much of what you get in larger packages isn’t used by some of those doing the best work out there. You’ll find top imagers that use their astro package to control the camera, get the images, pre-process and stack them, and they’ll then shift entirely (or nearly so) over to something like Photoshop or PixInsight. With Nebulosity, you can do all that for a fraction of the cost and with a far simpler user interface. This simpler interface has led many advanced users to abandon other packages and use Nebulosity in the field and for at least their initial processing.

Try it and find out! The demo is free and lets you try out all the features.More infoFor a full run-down, have a look at the feature list in the full manual or simply it and try it out (Download page). All features are enabled when you download it as a demo, but saved images will be degraded (diagonal lines superimposed) until you purchase a license. Thus, you can evaluate the software extensively prior to purchase.

Keep in mind, all changes are described in the and often are available with new features.