Longfocal length telescope

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Let’s begin with the most common laser found on a jobsite, the line laser. A line laser projects an accurate horizontal or vertical illuminated line onto the surface at which the laser is pointed. Use line lasers indoors when installing cabinetry, tile, a drop ceiling, or for basic leveling. They can also be used outdoors when framing or installing a deck.

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Focal lengthoftelescopeformula

We'll dive into each type of laser and for which applications each is most commonly used. We'll also outline a few key products offered by DEWALT for each category.

Focal length telescopecalculator

These objects have very low brightness and their apparent dimension in the sky may also be quite big. Therefore, they usually don’t need high magnification (many objects are framed with telescopes with focal length between 500mm and 1000mm) but it is important to use a fast focal ratio (not higher than f/8). By using a telescope with long focal ratio, it is in fact very difficult to capture the weakest details of the objects, even with a long exposure. Moreover, it is important to consider the flat field extension since the large size of the captured object requires large sensors.

One more parameter to consider when choosing a telescope is its portability. In fact the best telescope for you could be the one you can easily carry around and use rather than the most powerful one. Because of this, it is important to consider what you are going to use your telescope for and what it will be necessary to do to use it. For example, if you live in the downtown and you have to move searching for low light polluted areas, the best telescope could be an apochromatic one to take pictures of deep-sky objects with long expositions, or a Schmidt-Cassegrain in case of planetary imaging at high magnifications. If portability is not an issue (for example, if you live in a house with garden, away from too many lights), you might consider larger diameter telescopes like Newtonians which can be used also for visual use.

Line lasers are offered with a red beam or a green beam. A green beam is easier to see with the human eye because the green wavelength is larger than red. Green is also more visible in sunlight, so it is easier to see outside. When it comes to the visibility range, it depends on the lighting conditions. In dim, dusk-like conditions, it is possible to see a green beam for over 100 feet. One thing to keep in mind is that green beams do require more battery power than red beam lasers.

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The best long focal length telescopes to capture deep-sky objects (to capture even the smallest details of small objects like planetary nebulae and galaxies) are Ritchey-Chretien. They offer at the same time medium-long focal length (to obtain a high-magnification), a not too long focal ratio (to maintain a high brightness result in the image) and a wide flat field by using adequate field-flatterers (to obtain sharp point-like stars, even with large sensors). These instruments are quite expensive and require high quality tracking mounts: a longer focal length generate a higher magnification that requires a more accurate tracking.

Grade rods are used in conjunction with rotary lasers for digging or leveling earth. You must move the detector up or down on the grade rod while the rotary is spinning until you identify the laser line. When that laser line is found you have then established “grade” or level. If you are looking to dig a hole that is 3 inches deep, for example, you would move the detector 3 inches up the grade rod. After you dig 3 inches down and place the grade rod in the hole, you should hear a beep and read that the laser is hitting the detector. This is verification that you have dug the 3 inches deep.

When we use a camera to take a normal picture, we can select the magnification which best suits the object of our image, switching from wide-angle shots (for example 20mm focal length) to higher magnification shots (for example 200mm focal length). This freedom of choice is not possible in astrophotography as, due to telescopes special optical design and the specific characteristics of the objects they are used for, they need a fixed focal length that can be varied with the use of additional accessories but only to some extent.

What is a shortfocal length telescope

From an accuracy standpoint, DEWALT offers a rotary laser that works up to 2,200 feet with an accuracy of 1/16 inch at 100 feet. This laser is the 20V MAX* Tool Connect™ Green Tough Rotary Laser (DW080LGS). This rotary laser is extremely durable with the ability to withstand up to a 6-foot drop, and an IP67 rating for water and dust protection. Connect it to the Tool Connect™ app via Bluetooth® technology for features including tool tracking, bump notifications, fall and drop indications, and changes in slope and line detection.

**With respect to 20V MAX* - Maximum initial battery voltage (measured without a workload) is 20 volts. Nominal voltage is 18.

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Spot lasers differ from line lasers in that they project a small circle of light onto the surface your laser is focused on. They are intended for transferring points from one surface to another. This could be for making sure a joist or wall is plumb (vertical) or to ensure pipes traveling from floor to floor are plumb. Spot lasers are most commonly used for plumbing installation, electrical work, HVAC, and framing applications.

A large-diameter telescope is the most suitable to capture images of the planets, the Moon and the Sun, because it allows high-magnification and, therefore, it captures smaller details. Furthermore, longer-focal length instruments are preferable, because, by adding a planetary camera, it makes easier to obtain high magnifications (a specific Barlow lens is usually applied in the telescope focuser, in front of the camera to increase the focal length, above 2000mm). Among the variety of telescope models, the Maksutov-Cassegrain telescopes are great. They offer not a wide flat field but a high contrast in its center (which is where we most need it as a planet will always be small against the extent of the telescope framed field). Schmidt-Cassegrain telescopes are also great for this kind of objects since they provide a very good optical quality, easy to use (since they’re easy to collimate) at still an affordable price.

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Combination lasers project both lines and spots simultaneously or independently. These lasers are great for professionals who complete a wide range of projects as they allow the user to switch between lines, spots, or both depending on the job at hand. Electricians and plumbers will find these lasers to be extremely helpful for countless applications such as installing lighting, outlets, running wires, and pipes.

Telescopeaperture andfocal length

Finally, do we have to choose a suitable telescope for only one specific type of astrophotography, when we are looking for an appropriate telescope? No, we don’t need to. First, please note that if you are considering to buy an apochromatic refractor telescope to record long-exposure pictures, you can use it even for planetary and lunar imaging, even if it will have lower performances compared to a telescope which suits best for that application (such as a larger diameter Maksutov-Cassegrain telescope). If you are looking for a good-quality telescope for almost all uses, Celestron EdgeHD aplanatic Schmidt-Cassegrain might be the most appropriate solutions, since they can be used for both visual and photographic applications.

These telescopes have a long focal length and therefore you have to add a specially designed focal reducer to reduce focal ratio from f/10 to f/7, while maintaining a wide flat field. It is important also to consider that Schmidt-Cassegrain or aplanatic Schmidt-Cassegrain telescopes use an internal focusing mechanism which moves back and forth the primary mirror. As a result, in case of long exposition times, the primary mirror could slightly tilt (mirror flop), causing a slight shift of the framed field. This is a big issue when a guide telescope is installed in parallel to the SC for autoguide. In fact, due to the “mirror flop”, the field captured by SC telescope will slightly move, while the tracking camera will keep pointing in the direction of the guide star: as a result, the stars will appear slightly blurred. For this reason, the autoguide system should be made by using an off axis guider: this allows to guide using the main telescope and it also balances the possible small movements of the primary mirror caused by the mirror flop.

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Rotary lasers are used to kick off nearly every professional construction job. Their applications range from grade work (digging foundations), to layout and masonry. Both dual-slope and single-slope rotary lasers are used to continue a desired pitch across a large area. The desired pitch might be level for finding grade or when using a reference line. Dual-slope means that the line will move along both the X axis and Y axis. X mode is used often to “walk” the line in vertical mode for aligning metal track. Y is used to angle the line in horizontal mode for setting slope or setting pitch on a driveway.

An alternative and lower cost solution that you can consider searching for an “universal” telescope is the one of medium focal ratio Newton telescopes like the SkyWatcher 150/750 f5 Newton,  SkyWatcher Newton 200/1000 f5 and SkyWatcher Newton 250/1250 f5. These telescopes have lower quality optics and mechanics and they’re also larger and less portable. But, by having a very affordable price, they could be the ideal choice to start, even for visual use.

Focal length telescopefor astrophotography

As you can see, DEWALT offers a robust line of lasers including spot, line, combination, and rotary, as well as laser accessories to go with them. With the professional in mind, we will continue to evolve and innovate these products to accommodate needs on the jobsite. Keep checking back to see what new products DEWALT has to offer.

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DEWALT offers combination lasers in both red and green variations. Our newest combination lasers are offered in the 12V MAX* system and include 2-spot cross and 5-spot cross models. A suggested SKU is our 12V MAX* 5 Spot + Cross Line Green Laser. This laser includes an integrated bracket to easily mount onto metal surfaces. It also offers a 165-foot range with a detector for the line, and a 150-foot range for the spot.

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For example, apart from expensive solutions mostly for professional use, a short focal length telescope, which may be used to photograph deep-sky objects, can hardly be used to capture images of the planets or the moon.  Because of this, when we have to select the best telescope for our needs we have to choose between a specific-purpose telescope (do we need to photograph the planets or deep-sky objects?) or a more general one.

2000mmfocal length telescope

It’s possible to use a standard DSLR or mirrorless camera (properly connected to a telescope) to capture the first images of any celestial object. However, in order to obtain high-quality images, different acquisition techniques are used and telescopes with different characteristics are suggested. Astrophotography is in in fact divided into 2 main classes:

DEWALT offers spot lasers in both 3-spot and 5-spot. A 3-spot provides plumb and forward-facing dots whereas the 5-spot adds a right and left dot for transfer of points from wall to wall. A suggested SKU is our Green Beam 3 Spot Laser (DW083CG) with a high-visibility green beam. This laser includes a single lever power switch that locks the pendulum in the off position, as well as a built-in magnetic pivoting bracket to easily mount the laser onto metal surfaces.

There are 2 types of detectors used in the construction industry: Line and Rotary. Since line lasers and rotary lasers work on different wavelengths, they require specific detectors. The detectors are also color-specific. This means a red line laser requires a red line detector. For both rotary lasers and line lasers, detectors are not a requirement, but they do come in handy when the beam is no longer visible. For DEWALT, the standard visibility range on our line laser levels is 50 to 100 feet. While using the detector that range is extended out to 165 feet. Rotary laser detectors allow for detection up to 2,200 feet with the DW079 and DW080 series.

In order to capture great pictures of these objects, the used technique is to record one or several long-exposure pictures (generally, a long exposure allows to obtain a more detailed picture). The photograph should be carefully tracked during the exposure (that is, the mount must not have tracking errors since they produce blurred images) and therefore, especially for new users, it is important to use telescopes with not too high focal length to possibly reduce tracking errors. For this reason, the apochromatic refractors are the most suitable and they are often used, since they offer high optical quality (because of the apochromatic lenses), a proper focal ratio (generally between f/5 and f/7) and a wide flattened-field because of dedicated field flatterers. Short focal length Newton telescopes (focal length around f/4) are as well suitable solutions, especially when equipped with a good coma corrector. SkyWatcher Newton Wide Photo 200/800 f4 and SkyWatcher Newton Wide Photo 254/1000 f3.9 are an excellent solution because they offer good features at a moderate price.

Choosing the right laser can be hard. With such a wide offering, how do you know which one to choose for your job? In this article, we’ll dive into each type of laser and for which applications each is most commonly used. We’ll also outline a few key products offered by DEWALT for each category.

There are two types of projections, a forward projection and a 360 projection. The forward projection does just what it sounds like, it projects a line directly onto the surface where the laser is pointed. Similarly, the 360 projection will project a line 360 degrees surrounding the laser. For example, when using a line laser in a room, the forward projection would provide you with a line on one wall whereas the 360 would project that line on all four walls of the room.

These objects are very bright and, in order to obtain excellent images, it is necessary to increase magnification to capture all the smallest details (for example Jupiter’s clouds, Mars polar cap or a thin Moon rima). In this instance, the technique requires to use the so-called “planetary cameras” with the telescope to record a video on the computer: the video will be composed by different frames and processed by softwares specifically designed for astrophotography (such as Registax or AutoStakkert!) in order to select the best images (namely the images less affected by atmospheric turbulence). The pictures will be averaged to reduce noise, allowing us to apply special filters and improve the contrast level.

DEWALT offers these lasers on a 12V MAX* battery platform as well as with Alkaline batteries. Plus, our line lasers offer an integrated magnetic bracket to make them easy to mount during use. Suggested SKUs include our 12V MAX* 3 X 360 Green Line Laser (DW089LG) and our Green Cross Line Laser (DW088CG).

*With respect to 12V MAX* - Maximum initial battery voltage (measured without a workload) is 12 volts. Nominal voltage is 10.8.