Bushnell NorthStar 788890 Telescope Review
The telescope is a device that is gives the highest of magnification and also the one powerful device for the celestial observation. Among the different types of telescopes which differ in the basic components like the mirror or lens, the size, the power and the add-on features. Bushnell is a familiar brand that offers wide range of optical products. Its telescope segment comes in three categories like the northstar, voyager and harbormaster. All of these equip with the sophisticated models that impresses in many different ways. Bushnell Northstar 90mm x 1250mm Telescope (Product Code: 788890) belongs to the range of successful products and the following reviews gets you informed about the product details.
What’s Unique?
This model with the sophisticated motorised Go To tripod which is the Kinematic mount allows you to access over 20000 pre programmed celestial objects. This happens when after locating the celestial objects in just a push of button it comes you surprise you instantly. Once you are into the pre programmed objects gazing at the starts, planets and nebulae is just a cake walk. Also equipped with the Real voice output technology that gives the description in the real human voice and so the excitement goes never ending if you are equipped with this model and right from the beginners to the advanced level users Bushnell Northstar 788890 90mm x 1250mm Maksutov-Cassegrain Telescope is impressive. This talking handset interacts in only English language and lets you educated with the mythology, facts about the planets and other celestial objects.
Design:
This model is designed with the Maksutov-Cassegrain type that is made of components consisting of both lens and mirrors. It has a curved front lens and a curved mirror to produce implausibly sharp images while the structure being maintained compact. In the technology of folded light path the optical system provided in this model is much longer than the usual optical tube.
Magnification and Eyepiece:
This Bushnell NorthStar 788890 Telescope is designed to have the magnification of 50x and 312.5x. It comes along with the eyepiece of 4mm and 25mm. In case of the low power eyepiece it provides a vision of wider field and the images transformed are brighter. Such eyepiece is suitable for viewing planets, star clusters and constellations. When you intend to have a detailed study it is required to look for eyepiece which has higher magnification and that makes it possible to bring the craters, ridges and mountains on the planets and moon to vision.
Objective lens and Focal length:
The objective lens diameter or the diameter of the mirror is known as the aperture which directly relates to the brightness of the images. On the other hand the fact is as the magnification increases the brightness decreases. So it is essential for the maker to optimise among them and make it suitable for the particular application. The focal length is the measured path of light and it is referred in millimeter. This model is been designed with the aperture of 90mm and the focal length of 1250mm making it good enough for the celestial observation at the intermediate level.
Miscellaneous:
The finder scope that lets you locate and track objects is one essential feature and this model takes the advantage of Red dot LED finder scope. Being compatible with the camera the possible astrophotography makes the study go in an interesting manner. The tripod and the mount are unique with the quick release type of tripod in its kinematic mount. Bushnell Northstar 90mm x 1250mm Intermediate Level Telescope does come with an accessory tray to make it a complete product of convenience and performance.
Bushnell NorthStar 788890 90mm x 1250mm w/RVO Telescope - Technical Specification Table
| Manufacturer | Bushnell |
| Model Name | Northstar 90mmx1250mm Telescope |
| Model Number | 788890 |
| Telescope Type | Maksutov-Cassegrain |
| Magnification | 50 x, 312.5 x |
| Focal length | 1250 mm |
| Structure | Portable |
| Eye piece | 4mm, 25mm |
| Mount | Kinematic mount |
| Tripod | Quick release |
| Finder scope | Red dot LED |
| User level | Intermediary |
| Application | Astronomy |
| Barlow lens | Yes |
| Go To Computerized tracking | Yes |
| Astrophotography | Yes |
| Remote control | Yes |
| Talking handset | Yes - English |
| Accessory tray | Yes |
| Camera adaptability | Yes |
Celestron Omni 102 XLT Refractor Telescope
A telescope is merely for the professional and serious astronomers who spend nights exploring the dark sky. Most times they are dumbstruck and astonished to share their experience. Telescopes are the greatest in power and they are at least 10 times better than the high end binoculars. This optical device is sure to amaze anybody and can be a hobby device for the lucky ones. Celestron Omni 102 XLT Refractor Telescope from the maker of professional optical products guarantees quality and performance in each of its product along with providing coverage of 2 years warranty. This model that belongs to the Omni series of product does have few advantages of the many in its kind which is been discussed in the comprehend that follows.
Optical design:
Belongs to the refractor type of optical that uses lens primarily. They normally have a long and thin tube as structure. Having been known as Galileo type it is more conventional and has seen to be upgraded in terms of optics quality and the coating. Few of the prime positives are it is simple in design and easy to set up. It requires less maintenance and also good for both terrestrial and celestial observation. They are capable of offering excellent observation of the star formation, lunar and the planets. The tube length of this model is 1003.3mm. The weight of the same is 19.5 kg that is easy to transport in the back seat of the mid size car.
Aperture:
The diameter of the lens embedded in Celestron Omni 102 XLT StarBright XLT Telescope is 102mm which is one prime consideration on choosing a scope. Understanding that it functions in the light gathering to make the images brighter it is quite evident that the bigger will be the better. More details and better clarity can be experienced in the aperture of this level. When compared to the models prior to this deliver about 6 timer better vision of the star clusters and the planets.
Focal length and focal ratio:
The distance of the lens and the focus is the focal length which is 1000mm in this model and the ratio is 9.8. The point to be noted is that if the focal length is longer the power is more by it reduces the field of view as the objects are bigger in size. This model offers an optimal specification for intermediate level of use.
Optical coating:
Unlike the traditional optics this model is given the benefit of StarBright XLT coating that is a premium among the different available coating. For the high performance optics this finish gives clarity, better transmission of light, colour balance and optimised contrast levels.
Supported Features:
Mount – This model comes with the Omni CG-4 Equatorial mount that functions with 2 axes that are perpendicular and moves left to right axis. It is good for the activities like celestial viewing and photography.
Finder scope – This is a tool the helps to locate the objects and it functions as projected visual without any magnification. This model has 6×30 which helps to locate objects easy.
Tripod – Equipped with the three legged tripod that is made of high grade stainless steel which can be adjusted to the required height and can be spread across to increase the stability.
To detail it better Celestron Omni 102 XLT Celestial Telescope consists of an eyepiece of 25mm which gives a magnification of 40x. When a device that give a highest useful magnification of 241x and the lowest useful magnification of 15x it can do wonders both in land and sky observation. It is worth investing time and money on this model when it does come with a warranty of 2 years given by the manufacturer.
Celestron Omni 102 XLT Telescope - Technical Specification Table
| Manufacturer | Celestron |
| Model Name | 21088 Omni 102 XLT Refractor Telescope |
| Telescope Type | Refractor |
| Aperture | 102 mm |
| Focal length | 1000 mm |
| Focal ratio | 9.8 |
| Eyepiece | 25 mm |
| Magnification | 40x |
| Optical coating | StarBright XLT |
| Tripod | Stainless steel |
| Light gathering power | 212 x |
| Mount | Omni CG-4 Equatorial |
| Finder scope | 6×30 |
| Weight | 19.5 kg |
| Optical tube length | 1003.3 mm |
| Angular field of view | 1.25 degree |
| Linear field of view @ 1000 yds | 66 feet/20.12 m |
| Highest useful magnification | 241 x |
| Lowest useful magnification | 15x |
| Warranty | 2 years |
Celestron CGEM-800 Computerised Telescope Review
Celestron brings in this new series of telescopes that belongs to the high end with Schmidt Cassegrain mechanism of function. Celestron CGEM-800 Schmidt-Cassegrain Telescope comes with high sophistication of computerised operations and does have many supportive and convenient features. It has won the hearts of many and is been recognised as one of the best selling product and the hit list for the year 2010. The following is the review of the same that discusses the various features and functions.
Model Overview:
Celestron CGEM-800 Computerised Telescope has few standard features that include the fully enclosed optical encoders that support the position location. The mount of the same is compact and portable which can be disassembled easily. It comes with the database filter that allows to custom object list. It is also capable of storing programmable user defined objects and hence this sophisticated model is a sure go positive for the amateur astronomers.
Application and Observing:
Observing the moon, stars, deep sky objects, planets go in an interesting manner. Attempting to look at the moon with the help of the yellow filter makes it better with higher contrast levels and the density of natural is more. Rather when observing the planets the fact that the five naked eye planets can be just seen without any additional efforts. It’s a great thing to watch the cloud belts of Jupiter, the great Red spot, the moons of Jupiter and the Saturn and its rings. Observing the Sun is a thrilling experience but it is mandatory to use the Sun filters. Along with these observing the deep sky objects like the Milky Way, Nebulae, double stars and other galaxies is possible.
Technical Details:
All of these are made to be possible with the support of the technical ability. The functions of this model are extensive and so are the technical details.
- Type – Designed in the Schmidt Cassegrain type which is the combination of both the refractor and the reflector models which is simple known to be designed with the use of both lens and mirrors. This type perfectly suits photography purpose.
- Focal length of 2032mm / Focal ratio of F/10 – This is nothing but the point at which the image at the infinity is brought to focus. The higher the value the better performing will be the device.
- Aperture – With the practical power this telescope is been designed with the objective lens that measures 203.2mm in diameter. This transforms better light to the objects making it better for vision. The Asterism and the Asteroids are also visible with the required details.
- Finder scope of 6×30 – This helps to locate the objects accurately and can also proceed with it to follow.
- Eyepiece – Available with this model the eyepiece of 25mm that enables to magnify the image better than the actual available magnification. The further more details of the viewing image can be obtained with the use of the eyepiece.
- Mount – This model has a performing mount that is capable of holding the telescope firmly it is ideal for both imaging and observation. They are equatorial mount that can be adjusted in both axis. With simplicity in design and user friendly operation it delivers to be the best aspect of this model.
Computerised features:
This mount gives superior computerised features that has over 40000 object database and over 100 are user definable objects. It is a proven technology for simple alignment. The gear and the motors are made of durable material and is smooth and quite for operations. They also support for Astrophotography. This model does include NexRemote Telescope control software that is an advanced control system through the computer. The GPS compatibility is also available. Ultimately it an innovative, ergonomic and gives enriched performance.
What’s in it?
Celestron CGEM-800 Astrophotography Telescope is delivered in three main boxes that contain the optical tube assembly and the standard accessories in one and equatorial mount with hand control and the counterweight bar in the next box and the tripod plus one counterweight in the third one. From this with the help of the detailed instruction manual the setting up of the telescope can be started. Assembling the same can be done without additional hands or without any mishaps. It is rather quicker than expected with the help of the detailed instructions.
Warranty:
Celestron offers a 2 year limited warranty coverage for all its products and so is this model too enjoys the benefit.
Celestron CGEM-800 Telescope - Technical Specification Table
| Manufacturer | Celestron |
| Model Name | CGEM-800 Computerised Telescope / 11097 |
| Telescope Type | Schmidt-Cassegrain |
| Magnification | 480x |
| Focal length | 2032 mm |
| Focal ratio | 10 |
| Aperture | 203.2 mm |
| Eye piece | 25 mm |
| Optical coating | Star bright XLT Coating |
| Tripod | Adjustable, Stainless steel |
| Light gathering power | 843x |
| Mount | Computerised Equatorial |
| Finderscope | 6×30 |
| Weight | 39.92 kg |
| Warranty | 2 years limited |
Sky-Watcher BK15012EQ6 Achromatic Refractor Telescope
Sky-Watcher BK15012EQ6 Telescope feature with the new design that shows improved technical compared to the earlier models. Promising is the performance that lives up to the expectation of the astronomers of intermediate levels. Sky-Watcher offers products to suit the needs of different level users and its construction is a fusion of high quality material and latest technology. Consistency in innovation and the know-how aspect of the brand makes it a leading optical brand globally. This telescope obvious with all the benefits of the brand and is one of the best selling product in this current year 2010.
Design and Structure:
The structure is robust that withstands extreme weather and also makes it more resilient for rough usage. The tube with the glossy black finish with the base and the rim in bright white makes it a perfect contrast and comes to attract the professionals. The tube with the dimension of 15cm diameter and 120cm length takes the weight of 5.09 kg gets to easily transport in the back seat of the car. It is one best model for those wish to take along the travel.
Optical Design:
Designed with the Achromatic Refractor uses lenses for its construction which is one of its kinds that requires fewer efforts for maintenance. They are reliable and of course durable for the touch handling. The factors like the cost, size and its weight may be slightly higher than the reflector models. Both for the astronomers and land watcher this type of telescope brings satisfaction.
Aperture and focal length:
Like the size of the telescope that directly relates to the aperture and the focal length so is its performance too. The size of the objective lens diameter is 150mm and the focal length extends to 1200mm. Bringing you closer to the celestial objects like the lunar, planets and the galaxies is possible with this model. At most times the objects can be viewed clearing without being lost in the dark sky. The aperture also dictates the brightness of the viewing image and it stands to be justifiable for the intermediate level of users. On comparison with the model of 120mm aperture and 102mm aperture this device brings you brighter images about 56% better in the first case and 116% more light than the 102mm models.
Magnification and the lens:
The lens present in Sky-Watcher BK15012EQ6 Glossy Black Finish Telescope are fully multicoated with 4 layers and this achromatic lens makes the image clarity better and so is the contrast levels. The highest practical power of 300x can be experienced with this model and hence it proves to be a professional class instrument that serves well for the serious planet researchers.
Other features:
- Adjustable lens – The objective lens comes with the adjustable cell and it consists of dew cap and sunshade.
- Aluminium tube – The tube made of aluminium tube not only reduces the weight of the telescope but also gives a robust structure making it highly durable.
- Finder scope - Locating the celestial objects with the help of the finder scope is simple and quick. This is an important consideration for the efficient telescope and this model comes the the high power 9×50 achromatic finder scope.
Mount:
This BK15012EQ6 Telescope model comes with the Equatorial mount that is possible to be adjusted. It comfortably holds the telescope firmly to experience the deep sky observation. It does have slow motion control of RA&DEC that helps to track the objects and bring in a better study and understanding about the celestial objects. The tripod with the wall to wall accessory tray allows you to preserve the important stuffs required to support the observation and hence the study can go uninterrupted for long than expected. Along with all these features the manufacturer offers a motor drive of single & dual on the basis of optional choice.
Distinguished from the usual model Sky-Watcher BK15012EQ6 Celestial Telescope can be suggested for the intermediate level of user for the serious celestial observation and a hobby can also gets you interested for t he terrestrial viewing.
Sky-Watcher BK15012EQ6 Telescope - Technical Specification Table
| Manufacturer | Sky-Watcher |
| Model Name | BK15012EQ6 Achromatic Refractor Telescope |
| Telescope Type | Refractor |
| Magnification | 300 x |
| Focal length | 1200 mm |
| Finder scope | 9×50 |
| Aperture | 150 mm |
| Eye piece | 42 mm |
| Astro photography | No |
| Tube weight | 5.09 kg |
| Tube dimension | 15 x 120 cm |
| Focal ratio | f/8.3 |
| Lens | 4 layer multi-coated achromatic lens |
| Motor drive | Single & Dual optional |
Bynolyt Bynostar SPN 114/500 Telescope
Bynolyt Bynostar SPN 114/500 Telescope belongs to the Newton Reflector type that is been designed with the use of mirrors. It brings out the compactness in the device and is light in weight too with 8 kg. It permits to be used by the beginners and suitable for travel purpose. Best for the starting amateurs who which to study the rings of Saturn, star formations and the Lunar. Bynolyt made it possible to offers such models with an affordable price. This model is the one outstanding in features and the following review gives you more detail about the product.
Technical Basics:
The various technical factors that determine the viewing quality that can come to fulfill. At the outset the important aspect is the quality of the optics and the durability along with the usage convenience.z
- Aperture – This is the objective of the telescope and the larger the aperture the better will be the viewing quality. This model offers 114mm and so forms to be an intermediate level use as the basic model should start from 70mm aperture. Without the concern of bright or dark sky viewing through a telescope with high aperture makes a spectacular difference.
- Focal length – This is another key specification that also tells you about the magnification ability. This model comes with the focal length of 500mm. The focal ratio is 4.4.
- Eyepiece – The magnification of the telescope can be changed with the help of the eye piece that is been supplied. This model comes with the eye piece of 1.25”. The maximum magnification offered by this device is 228x which means the object becomes 228 times bigger than its actual size.
Convenience features:
It is required to have something sturdy to support the telescope like the tripod or the mounts. Generally speaking the tripods are useful for prolonged astronomy while the mounts are designed give a sharp and professionalised observation of the celestial bodies. Bynolyt Bynostar SPN 114/500 Reflector Telescope comes with the Equatorial mount and the tripod for the utmost user convenience. The equatorial mount is the simplest to install and it helps to track the movement of stars by tuning the given axis. The finder scope of 5×24 is an added benefit to serve the tracking procedure.
Miscellaneous:
The other technical advantages of this device are the slow motion control RA & DEC that performs the observation and the study in a detailed manner. The faintest star that can be visible is in the magnitude of 12.4, while the resolving power is 1 arc second.
Bynolyt Bynostar SPN 114/500 Compact Telescope being the intermediate level is has electronics to be appreciated and it lets open the celestial doors for the delightful observation that can be carried on for the lifetime.
Bynolyt Bynostar SPN 114/500 Telescope - Technical Specification Table
| Manufacturer | Bynolyt |
| Model Name | Bynostar SPN 114/500 Telescope |
| Telescope Type | Reflector |
| Dimension | 150 x 410 mm |
| Focal length | 500 mm |
| Weight | 8 kg |
| Eye piece | 1.25” |
| Tripod | Yes |
| Finder scope | 5×24 |
| User level | Intermediate |
| Application | Astronomy |
| Aperture | 114mm |
| Mount | Equatorial |
| Slow motion control | RA & DEC |
| Focal ratio | 4.4 |
| Maximum magnification | 228x |
| Faintest star visible | Magnitude 12.4 |
| Resolving power | 1 arc second |