Optical aberrations in amateur telescopes. Includes principles of physical and optical imaging with detailed review of primary aberrations. Also, aberrations in popular reflecting, refracting and catadioptric telescope objectives, telescope eyepiece and human eye.
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Amateur Telescope Optics | telescope-optics.net Reviews
https://telescope-optics.net
Optical aberrations in amateur telescopes. Includes principles of physical and optical imaging with detailed review of primary aberrations. Also, aberrations in popular reflecting, refracting and catadioptric telescope objectives, telescope eyepiece and human eye.
telescope-optics.net
Aberrations of a conic surface
http://www.telescope-optics.net/conic_surface_aberrations.htm
9642;▪▪▪. 33 Conics and aberrations. 34 Terms and conventions. 332 Aberrations of the conic surface. Since aberrations inherent to conical surfaces vary, in general, with their eccentricity, degree and sign of curvature, object distance, as well as the entrance pupil location, two or more surfaces can be combined in order to minimize or cancel the final aberration. In all, there is five intrinsic telescope aberrations characteristic of a conic surface of revolution. Of a conic. It is illustrated on t...
Telescope image: ray, wavefront and diffraction
http://www.telescope-optics.net/wave.htm
9642;▪▪▪. 1 TELESCOPE IMAGE: RAYS AND WAVES. Rays, waves and wavefront. By making space objects brighter and larger, telescopes greatly expand our ability of their detection and observation. But how do they do it? What influences their performance, and how? This is the subject of this text. The latter is an lineal interface based on the simplified directional model of light propagation. The former is physical optics. And the latter geometrical optics. Provides convenient way of determining image location.
Zernike aberrations
http://www.telescope-optics.net/zernike_aberrations.htm
9642;▪▪▪. 352 Zernike aberration coefficients. Zernike polynomials, basic properties. Zernike polynomials and wavefront. Zernike term for primary spherical aberration (example). Any wavefront deformation can be described to a desired degree of accuracy. The usual way of applying Zernike terms is to the specific wavefront shape, which is decomposed to a needed number of terms in order to determine: (1) the main forms of contributing deviations, and (2) the overall magnitude of deformation. For simple aber...
Lower-order spherical: aberration function, blur size
http://www.telescope-optics.net/lower_order_spherical.htm
9642;▪▪▪. 411 Primary spherical aberration. 413 Higher-order spherical aberration. 412 Lower-order spherical: aberration function, blur size. Best focus vs. classical. Diffraction image, wavefront, ray spot. The P-V wavefront error of primary spherical at paraxial focus is W=s(. 961; d)4, with s. Being simplified notation for the aberration coefficient from Table 4. For the lower-order, or primary. Being the aberration coefficient. For spherical aberration, d. The pupil radius and. The sign of P-V wavefr...
Spider diffraction and apodization
http://www.telescope-optics.net/spider.htm
9642;▪▪▪. 711 Telescope central obstruction: size criteria. More often than not, central obstruction by a smaller secondary mirror is accompanied with aperture obstruction caused by its support structure - so called spider vanes. Their effect is generally small, but it can be significant. That makes them worth of a closer look. Unless the secondary mirror cell is supported by an optical window, the supporting vanes - so called spider vanes. Analogously to the central obstruction effect, what. Can be thou...
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Books | Neil English.net
http://neilenglish.net/books
Skip to primary content. If you like my work, you may also like one or more of my books. Classic Telescopes; A Guide to Collecting, Restoring, and Using Telescopes of Yesteryear. Choosing and Using a Refracting Telescope. Choosing and Using a Dobsonian Telescope. Grab ‘n’ Go Astronomy (newest title). Want to explore more? Follow me on Facetube and Twatter. Eye. A Modern Commentary on W.F. Denning’s, “Telescopic Work for Starlight Evenings (1891). Bible Facts Part II. The Pioneers of Parsonstown.
Useful Links | Innovations Foresight - Innovations Foresight
http://www.innovationsforesight.com/education/useful-links
On axis Guider – ONAG. Wave Front Analyzer – Star Waves. Real Time Auto-Focus: FocusLock. Accessories – Adapters – spacers. Returns & Warranty. ON Axis Guider – How does an ONAG work? Continuous Real Time Autofocus. Guiding in near infrared (NIR). Wavefront analyzer – Star Waves. How much guiding error is too much? How much focus error is too much? Introduction to astronomical seeing. Celestron EdgeHD back focus tolerance. Documentations, tools and drivers. OPTEC ASCOM server download. Legal & etc.
Misc › Photography › Nenad Filipović's Homepage
http://www.nfilipovic.com/photography/misc-photo
TAL 200K OTA Review. All those albums that did not fit in the other categories. Flight JU242 from Belgrade to Paris. Snow in Belgrade 2006. Ride the Lightning, Belgrade 22.06.2006.
Deep Sky › Astrophotography › Nenad Filipović's Homepage
http://www.nfilipovic.com/astrophotography/deep-sky
TAL 200K OTA Review. Photographs of astronomical objects outside of the Solar System. Comments and technical data can be found next to each image. Images have been divided into chronological sections, and most of these correspond to a particular development phase of the imaging system. Vidojevica Mountain, July 2016. Sbig STT-8300 (Baader R, G, B, H-a and O-III filters). RC 250 (with two element field flattener) on ASA DDM60 Pro. R=4x5min, G=4x5min, B=4x5min, H-a=6x5min, O-III=6x5min. Sbig STT-8300 (Baad...
Panoramic Equipment › Nenad Filipović's Homepage
http://www.nfilipovic.com/panoramic-photography/panoramic-equipment
TAL 200K OTA Review. Panoramic Head and Tripod. Panoramic head has been designed to be as compact as possible, but sturdy, robust and fully capable of shooting full spherical panoramas. It is composed of Manfrotto 300 N panoramic rotator, and two Manfrotto 357 sliding plates. The rest of the head has been machined from aluminium on the lathe in a workshop. 2 Correctable chromatic aberration to provide uniform quality. Lenses with poor correction in the blue end of the spectrum usually exhibit spheroc...
Hi-Fi Tube Audio › Nenad Filipović's Homepage
http://www.nfilipovic.com/electronics/hi-fi-tube-audio
TAL 200K OTA Review. Introductory Disclaimer: Before beginning, I feel obliged to inform the readers of this text that my views on high quality tube audio are mostly different and quite contrary to the "common knowledge and practice" that has come to be established on this topic. In my approach, I tend to keep a tidy, scientific engineering approach and I also strive to avoid "religious" attitudes that are also common in Hi-Fi world. EF86, triode connected. EL84, triode connected. This is where all of my...
TAL 200K Telescope › Astrophotography › Nenad Filipović's Homepage
http://www.nfilipovic.com/astrophotography/tal200k-telescope
TAL 200K OTA Review. TAL 200K OTA and its optical system are a large topic on their own, and are discussed on this page. The telescope as a whole is somewhat a typical Russian product, a unique mix of pros and cons:. The most important part of the system - the optics - is excellent. Overall build quality is sturdy and robust - Russian style. Upgrade friendly - initial build quality provides for enhancement and modification. Flexibility - can serve for many astronomical purposes other than visual observing.
Planets › Astrophotography › Nenad Filipović's Homepage
http://www.nfilipovic.com/astrophotography/planets
TAL 200K OTA Review. Photographs of the Solar System planets, taken with a narrow angle camera and various filters. Comments and technical data can be found next to each image. Jupiter 01.10.2011. UEye UI1460C (Neutral Color Mode) on RC 250. 25x Barlow Lens (f/D = 20). 1000 Frames, Exposure Time 25ms, Gain 12x (100%). 02h05m UT, 01.10.2011. Image taken during equipment tuning under unstable urban skies in Belgrade. Saturn from the Jastrebac mountain. Philips PCVC 740K (RAW Mode) on TAL 200K. 45x Barlow L...
250mm f/8 Ritchey-Chrétien Telescope › Nenad Filipović's Homepage
http://www.nfilipovic.com/astrophotography/rc250-telescope
TAL 200K OTA Review. 250mm f/8 Ritchey-Chrétien Telescope. D=250mm, f=2000mm, f/D=8. D=250mm, R=-1510mm, f/D=3, K=- 1.154. D=100mm, R=-862mm, m=2.67, K=-6.512. Primary - secondary mirror separation:. Fully illuminated / maximum usable field diameter:. All aluminium parts received black anodized surface finish, while steel parts were powder coated (thermoplastic coating). After the appropriate dust covers were made, mirrors were mounted in their cells and fixed by provided means of mechanical adjustme...
TAL 200K OTA Review › Nenad Filipović's Homepage
http://www.nfilipovic.com/astrophotography/tal200k-ota-review
TAL 200K OTA Review. TAL 200K OTA Review. This review will put many aspects of this telescope to a very strict test, both theoretically and from the practical side. Additionally, key concepts of its design that I consider important will be explained in detail as well. Newtonian telescope in the last column is not really practical to build, and is given for reference only. Schmidt-Cassegrain example is a close match to Celestron C8, Maksutov should be similar to Intes M703, and Ritchey-Chrétien 250mm ...
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NGC 288 (globular cluster in constellation Sculptor), observed with telescope omara on Thu May 26 17:59:28 2011 UTC (4.22 years ago). More images. Is any of this useful or cool? Then please help us to keep telescope-net. Astrocoder" / SCS service. Observing info for you. Moon rise and set. Sign up - log in - see the sky! With a login to this website, you can:. Undertake educational astronomy projects, with your school, your class, or individually. And " Google module stuff. Find your observing site.
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Amateur Telescope Optics
Možda su crne tačke bile ptice u letu. (Maybe the black dots were birds in flight). On an early autumn day of 1608, Hans Lipperhey, a spectacle maker from Middelburg, in the Netherlands' coastal province of Zeeland, applied before the States General of The Hague for a patent on an instrument for seeing far. By that time, use of small rounded glass disks to aid the natural eyesight wasn't new. Those bulging out on both sides, resembling lentil - or lens. I and II, Virendra N. Mahajan, (4) Optics. EFFECTS ...
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Telescopes and Space News. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer bibendum non justo vel euismod. Etiam vel ullamcorper nibh. Morbi sollicitudin nisi at lectus mattis accumsan. Suspendisse lacinia volutpat risus non mollis. All Posters. Posuere imperdiet urna non venenatis. Pellentesque viverra laoreet porta. In dictum a risus et blandit. Cras cursus tortor ut nulla vulputate auctor. Aliquam molestie dapibus ante non feugiat. Sed vel elit quam. Not modified by our script) Ut fer...
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Thursday, April 23, 2009. Celestron NexStar 5 SE Telescope. Celestron NexStar 5 SE Telescope. Now I find Celestron NexStar 5 SE Telescope from amazon website you can see now. BuZZ from Customer Shopping. Celestron NexStar 5 SE Telescope. Good telescope, but Celestron does not give full specs upfront. 1 Celestron advertises that the scope can be used with 8 AA batteries. This is not completely true. The batteries drain very quickly and will probably not even last one viewing session (say 30 mins). Why do ...
