Maksutov-Cassegrain pros and cons ProsĪs you can see, both types have many advantages and disadvantages. Newtonians on the other hand only take 5 to 10 minutes to do so. Depending on where you store them, you might want to take them out an hour before you use them to give it time to acclimate. Maksutovs take considerably longer to acclimate. This means that if you bring them outdoors on a cold night from storage where it might have been warmer, it will take a bit for the telescope to settle to ambient temperature. Telescopes need to be at ambient temperature in order to perform at their best. This process is called “collimation” and while it sounds intimidating, anyone can do it with a little bit of practice.Īgain, they both have pros and cons in this area because Newtonians do require collimation every few months, but it is easy to do, while Maksutovs need to be collimated maybe once every couple of years, but they are trickier to collimate.
If you have never used a telescope or if you are coming from using a refractor that never or almost never needs maintenance, you might not know that every once in a while the mirrors in the telescope need to be re-aligned or they’ll start showing small optical errors. Choosing Eyepieces When you’re selecting a new eyepiece, the first and most important consideration should be how it fits in with the eyepieces you already have particularly, your magnification scheme. The following diagrams show how each transmits the light.Īnother important thing to consider is collimation. The light travels back and forth across the tube 3 times thanks to the secondary mirror at the end of the tube. How is that even possible? Well, that’s because the design of Maksutovs is very clever. On the other hand, MAKs pack a longer focal length into a smaller tube and a more compact design. The light only travels through the tube once, which makes the focal length of a newt almost the same as the length of its tube. Newtonians transmit light by using a long tube and reflecting the captured image into a second mirror that sends it to the eyepiece. To cite this article: M G Beker et al 2012 J. Differences between Maksutov-Cassegrain and Newtonian/reflector telescopes Newtonian noise and ambient ground motion for gravitational wave detectors. To keep things short we will sometimes refer to Maksutov as MAKs and Newtonians as newts. So here are the differences, pros, and cons of each other to help you make a more educated choice. When you compare them to refractors or Dobsonians, they have clear advantages and disadvantages, but when you compare them to each other, things can get confusing. The rate of change of the fluids velocity vector determines the stress. The options can get overwhelming.īut one of the hardest pairs to choose from is when you face Maksutov-Cassegrain vs Newtonian telescopes because they are very similar to each other in many categories. Newtonian fluid is defined as the fluid which will have viscous stresses generated from its flow that are linearly proportional to the local strain rate, the rate at which its deformation changes over time at every site.
There are so many types to choose from: Refractors, Newtonians, Dobsonians, various types of Cassegrains, etc. NOTE: Most of the data in this chapter on the flow properties of non-Newtonians are gathered from Skelland, Charm, and Muller and from the Handbook of Chemistry and Physics, 47th ed., Chemical Rubber, Boca Raton, FL (1966).One of the decisions that can be harder to weigh when it comes to choosing a new telescope is what type of telescope is best for your particular needs. A good, well-organized review of theory and experiment on flow and heat transfer of non-Newtonians having a yield stress. Yarusso, Reviews in Chemical Engineering, 1, 1 (1982). In comparison to other telescope types, Newtonians provide a reasonable. Afraid to leave anything out, has everything an omni-book. Newtonian telescopes, named after Sir Isaac Newton, are one of the most common. Aziz, The Flow of Complex Mixtures in Pipes, Von Nostrand Reinhold, New York (1972). Delightful gem, even recommended for bedtime reading. Muller, An Introduction to Food Rheology, Crane Russak, New York (1973). Hurriedly written and difficult to follow but has much useful material. Charm, The Fundamentals of Food Engineering, Second ed., Ch. Excellent primary reference go here first. Lightweight and easy to guide, this little Newtonian comes ready to go out of the box with a 2' Crayford-style focuser, dual split-hinged mounting rings, an 8x50 straight-through finder, and. 8') f/4 Newtonian optical tube assembly (OTA) from GSO has fast optics for imaging extended deep-sky objects with a DSLR, webcam, or dedicated astronomy camera. Skelland, Non-Newtonian Flow and Heat Transfer, Wiley, New York (1967). This compact and affordable 200mm (approx.
0 kommentar(er)
