2024 Istar refractor

Istar refractor

Author: tqne

August undefined, 2024

WitrynaAchromatic refractors have been used extensively in the past. In particular long focus refractors are interesting for reduced chromatic aberration. In this brief report1 a test … Witryna3 paź 2007 · HI. I do not know that beside myself, anyone else has purchased the ISTAR-OPTICAL 8" F8.8 achromatic refractors scope from Ales. This is a big and massive scope, at 6Ft long, without the dew shield, and weighing 45 lbs for the OTA alone. It needs 3 person to carry and mount it onto my losmandy CG11.

Istar refractors Pros and Cons? - Refractors - Cloudy Nights

Witryna18 maj 2016 · This yields 88% transmission. This corresponds to the light transmission of an unobstructed 7.51" refractor with perfect transmission. In reality, an air-spaced doublet has 4 surfaces with (ideally) 0.2% loss, or 0.8% total. Modern optical glasses have very low transmission losses, so these losses can be ignored. Witryna8 maj 2009 · There doesn't seem to be a great deal of difference but the Dob will usually win on shear light gathering ability. I just ran the numbers (in the Calculator) for my 127mm (5") iStar refractor and my 16" GSO dob and the limiting magntude difference (at 200x) was 14.6 for the refractor to 16.2 for the dob, not a great deal of difference, … child benefit theory

Refractor Telescopes for Stargazing and Astrophotography

Witryna11 lis 2024 · Published: November 11, 2024 at 2:26 pm. Taking delivery of a telescope like the Istar Perseus AT150-12, you really start to grasp the significance of the numbers 150mm and f/12. This is a very big refractor, and an impressive sight to say the least. The Istar is designed and manufactured mainly in the Czech Republic. Witryna10 sie 2010 · It seems to be one-of-a-kind except for maybe the Istar Optical Phoenix WFT 150mm F/5 refractor. And the Vixen is a little less expensive. Back to top #10 SeattleScott SeattleScott. Hubble. Posts: 14,854; Joined: 14 Oct 2011; Posted 18 June 2012 - 11:07 PM. The NA 140 is a very unique instrument. ... Witryna2 sie 2024 · Posted 08 August 2024 - 05:32 PM. Heya, I don't think D&G are still dropping scopes on your door step often enough. You could look into an iStar Optical objective lens of your choice. And then have Siebert Optics make the OTA (they do custom modular refractor OTAs and you supply the lens). That said, I would really … gothic revival prefab homes

$Istar Asteria TCR 204-8 R35 - Refractors - Cloudy Nights$

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Witryna6 sty 2004 · Page 1 of 3 - Istar 127mm f12 R30 Review - Neil English - posted in Refractors : For those interested, this review can be seen through the Istar website.I … WitrynaiStar’s newly designed and produced Phantom FCL 140-6.5 is the first-ever imaging Super APO refractor with fully detachable 80 mm rear section to allow for the use of … gothic revival libraryWitrynaAs you may know the weight of the original classic construction Perseus AT 150-12 refractor, excluding mounting rings and dovetail, is 14.47 Kg (31 lbs.). While this is … gothic revival homes in america

"WitrynaRefractor. A refractor is a telescope with a lens in the front that captures the incoming light and converges it to a focal point by refraction. There are roughly two types of refractor telescopes; achromatic and apochromatic refractors. Achromatic refractors have a dual lens element design. " - Istar refractor

Istar refractor

$Istar Perseus AT150-12 achromatic refractor review$

WitrynaTest of iStar Optical 150mm F15 achromatic refractor. by Bartolomeo Montrucchio, Italy Perseus AT 150-15 OTA. Report by member „Rutilus“ at www.cloudynights.com. Very short report on my iStar 150mm f/15. Last night I was observing a few double-stars and the scope was taking high magnification very well. The scope seems to have a real … Witryna30 lis 2008 · Posted 25 September 2012 - 07:10 PM. The "received view" is that refractors are better than reflectors for observing doubles. That said; an 8" refractor is huge and an 8" reflector can be small. An 8" reflector, well collimated and with a descent mirror, will split doubles that a 4" refractor will not.

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WitrynaTest of iStar Optical 150mm F15 achromatic refractor. by Bartolomeo Montrucchio, Italy Perseus AT 150-15 OTA. Report by member „Rutilus“ at www.cloudynights.com. Very … Witryna6 kwi 2024 · With the use of the browser it is possible to: browse data concerning goods nomenclature, duty rates and other measures, and also additional information (this third category includes: Legal Notes, Explanatory Notes, Binding Tariff Information and Lists of Goods, Classification Regulations, Explanatory Notes for CN, Classification Rulings of …

Witryna30 gru 2008 · Page 1 of 5 - Istar 8 F/6 - posted in Refractors : Im really excited! Just placed an order through High PointScientific for Isatr NEW{REDUCED WEIGHT}8" F/6 Comet Hunter. Mike at Istar said including rings the weight should be around 30lbs with the overall all length at 48".Should be here in about 4-5 weeks. Ill let you know then … Witryna30 mar 2024 · drd715, on 05 May 2024 - 04:12 AM, said: Istar is currently near the production of a 140mm triplet F-6.5 lens cell (5 test samples were completed so far) and a 160mm CaFl doublet is up next. Both are near first run production. The cells will be offered first (soon) with complete OTA's near end of the year or early next year.

Witryna22 kwi 2009 · Thoughts on Istar 180/1440 Refractor - posted in Refractors : I have recently completed a Berry mount for my 2014 lensed Istar 180 f-8 Achromat. Over the past fortnight I have enjoyed some good viewing using this large lensed refractor in my back yard in Suburban Auckland. Last evening I viewed split Sirius at 131 X and 180 … WitrynaThe Stupid Astronomer on Instagram: "This morning was calm and crisp ...

Witryna26 lis 2006 · Page 1 of 2 - Istar 204mm f5.9 review - posted in Refractors : Finally got this little beast under some proper dark skies last week. This review is by no means an authoritative critique; rather a gentlemans observation of some very affordable and very nice glass. First off heres the business end, followed by a home-built OTA cut down …

Witryna27 kwi 2005 · Page 1 of 4 - Istar Asteria TCR 204-8 R35 - posted in Refractors : I prepare small test this telescope and I am very excited from it. Construction the … child benefit threshold 21/22Witryna2 gru 2024 · The Phantom FCL 140-6.5 is, therefore, a great all-round refractor, and the manufacturer has promised to remedy the minor mechanical issue with the amount of … child benefit to increaseWitrynaRecently iStar Optical became a registered supplier of optics for the prestigious STAR Labs of Lockheed Martin Aerospace and Defense Company. ... as well as by … gothic revival interior designer seattleWitryna29 mar 2015 · While a fast (f/5 or faster) Newtonian of 200mm (eight-inch) aperture or more is a good rich-field telescope, an achromatic refractor of similar specifications can do considerably better, owing … child benefit timescaleWitryna18 wrz 2010 · One thing is always true about early adopters though. Version 2.0 is always superior to version 1.0 because the manufacturer addresses issues that come to light with early adopter use. Typically improved feature sets, additional content and a lower price are what early adopters miss out on. gothic reworkWitrynaSoon, all iStar achromats will feature the R30 option, including apertures from 127-mm up to 250-mm. Better yet, the R30 option adds only about 25 percent to the cost of … gothic revival textilesWitryna24 paź 2008 · What size ERF? - posted in Solar Observing and Imaging: This might be insane, but hopefully you all can shed some light on my idea. I have an 8 f6 istar refractor with a 3.5 feathertouch focuser and an Earthwin Binoviewer system that uses 1.7x and 2.5x barlows. To keep tube currents down Im thinking that a 90mm ERF … child benefit two children