Luckily I didn’t have that issue with mine. While a short focal length 102mm apo is nice to have in one’s lineup, the 127ED will be much more versatile and will not leave you wanting. Last autumn I set up the ED127 side by side with the AR152 for a deep sky shoot out and the results were not what I expected. With a 5" (127mm) aperture, this Explore Scientific "Essentials Series" ES127 ED triplet refractor gathers 55% more light (with nearly 25% higher resolution) than the more common size 102mm (4") doublet and triplet refractors that often cost nearly as much as the ES127. by Tom Fowler. This latter arrangement, with Hoya FCD1 glass, an equivalent to FPL-51, in the central position in the triplet, is used by Explore Scientific for its 127ED apo refractor. With this scope, I didn’t find any. If atmospheric conditions are good, it’s very difficult to detect the CA, but if the conditions are poor or the telescope isn’t thermally stable, it’s quite obvious. Have I stopped using my 6″ achromat? At $2,000, the complete 5-inch scope was the same price as a new Ford sedan in 1958, the year I first saw the catalogue. Compared to the 6″ achro, finding perfect focus is much easier with the ED127 — sometimes I have to fiddle with the focuser a bit on the big achro to find perfect focus, but the ED127 snaps right into focus and there is no doubt when you are at best focus. For five nights, I went back and forth between the two and can report that the new kid on the block made a fine showing. Hi Michael, If you read that article and the following comments, you know I really like that big achromat. It comes with a white aluminum tube with black accents. After the fix, Explore Scientific offered to replace the entire scope if I still wasn’t happy with it. Everything about this telescope is impressive in detail, from the impeccable glossy white enamel finish to the solid focuser with its 10-to-1 fine-focus feature. Maybe it would make more sense to just upgrade the AR102 to the 102ED and the benefit to that is less weight and an easier place to practice and learn AP. (Set up in the backyard, this is an impressive scope.) Reviews The Explore Scientific 127mm f/7.5 ED APO Refractor Telescope is one of the most innovative ideas in high-quality apochromatic designs. We go to the forums for information, and it can definitely get to you after a while and make you doubt yourself. Canada's magazine of astronomy and stargazing in print or digital. So the concern for me is side effects, the 127ED weighs 22 pounds plus finder and cameras might make it 25 total, the mount is rated for 30lbs. Bottom line, if you don’t want to drop the coin for one of the premium apo refractors, but you want a little taste of that apo performance, the budget ED apos like the Explore Scientific ED127 or the Sky-watcher Pro 120 ED are a great choice. The Explore Scientific ED80 was recommended to me by a friend I met on an online astrophotography forum. The ES ED127 also has a sliding dew shield which is nice. I mainly got this telescope to use for lunar and planetary observation and imaging and it does not disappoint. Has it caused you any problems being it two thirds the mount capacity? There was barely any dust on or between the lens elements. It’s also fun to take the 152 to outreach events because it always impresses people and everyone wants to look through it. Change ), You are commenting using your Google account. ... Aperture 127mm (5inches) Focal Length 952mm, f/7.5; ... APM 107mm triplet apo refractor review. Aperture: 127mm (5.0 inches)Type: triplet apochromatic refractor (Hoya FCD1 ED glass)Focal length/focal ratio: 952mm, f/7.5Weight (tube assembly, including standard accessories): 20 poundsStandard accessories: tube mounting rings, 50mm finder, 2-inch diagonal, dovetail plate. But like I said there is CA on the 102 on bright objects for sure. The forum over there always makes me feel like my gear is all just garbage, but when I stop reading the forum and just enjoy what I have, I don’t even think about it. The focuser racked out easily enough; however, when I tried to rack it back in, it would hang in spots and the smaller fine focusing knob would spin but wouldn’t move the focuer tube in or out. Suggested by the SkyNews team, here’s a range of celestial gifts for the space aficionado in your life. I must say that I am very happy with the Explore Scientific ED127 and there is indeed some truth to the hype around ED and apochromatic refractors. It does not come with a finder scope, diagonal, or carry case like the carbon fiber version of the scope. Either way I go the cost is about the same, but if I did the later I would get to keep a very nice 152mm scope. I just wanted to say great review, I enjoyed reading it but I do have a question for you. Overall, the scope seems pretty solid mechanically (once I got the focuser issue worked out). Whereas with the doublet, some of the energy is being lost to unfocused wavelengths of light. Explore Scientific Air-Spaced Apochromatic Triplets have true APO optics and are diffraction limited at … I was transfixed, staring intently at each page, imagining myself controlling the bigger models, sketching the festoons in Jupiter’s equatorial belts and splitting threshold double stars. The collimation was spot on and the diffraction rings were, for the most part, the same on both sides of focus. Like the AR152, the scope has a nice solid cradle with a carrying handle on top making it really easy to lift the scope for mounting. Photo by Brian Hancock of Memphis Astronomical Society. Change ), Review – Explore Scientific 127 ED Air-Spaced Triplet Apochromatic Refractor, Explore Scientific 127 ED Triplet (ED127), Book Review – The Greatest Comets in History: Broom Stars and Celestial Scimitars, Review – Explore Scientific AR152 Achromatic Refractor. I would be interested in seeing a shootout between these two scopes under dark skies. M110, a darf satellite galaxy of Andromeda, was slightly brighter in the AR152 than the ED127. Another arrangement is a triplet, with the central piece made of FPL-51 glass, a slightly less “exotic” version of ED glass. Appreciate the review and look forward to more from you regarding these two scopes. The scope turned out to be a good deep sky performer too, but more on that later. If you like to chase down the faint fuzzies, you’d be better served by a larger scope — I would say this scope is on par with a 6″ reflecting type scope when it comes to the fuzzies. Theophilus, Cyrillus, and Catharina f/7.5, Close Up of Plato Crater and Alpine Valley. Unitron was famous for its full line of achromatic refractors, which ranged from a tiny 40mm model to the colossal 6-inch monster with a tube that towered 10 feet above the observatory floor. I hate to bother you again but out of curiosity, how do you feel about the weight of the scope on the AVX when imaging? Have you checked collimation on the achro? When properly made, this objective comes so close to eliminating chromatic aberration that the scopes were designated apochromatic—effectively free of false colour — with the added bonus of being about half the length of an achromatic refractor. With the 127ED you will get a little more contrast and stars will focus down tighter since more energy is being focused in the Airy disk. But the inherent inability of its two-element (crown and flint glass) objective to focus all vis­ible colours to a point meant that the spilled light—mostly blue, some red — compromised performance, not to mention its cumbersome long tube. A fringe killer filter does help tighten things up a bit in the achro, but it still doesn’t match the clarity of the apo. The handle makes hoisting the tube assembly atop the mount a simple procedure. Now I am at the point where I want to try AP I purchased 2 ZWO cameras ASI120mm’s and their guide scope. Stars focused tighter and had a lot more “punch” than in the achromat. Refactors such as the Explore Scientific ED127 apochromat make great all-round instruments, suitable for both visual observing and astrophotography. Another arrangement is a triplet, with the central piece made of FPL-51 glass, a slightly less “exotic” version of ED glass. Maybe some day. Common wisdom dictates that aperture always wins on globular star clusters. I purchased this telescope about one year ago from Hands on Optics. Let’s get to where the rubber meets the road — optical performance! Even then its just a very small amount, I think I got a very good example with my152. For many years, I have regarded 5-inch aperture as the largest size apo refractor that is still reasonably portable. So my concern is not so much the scope as it is the AVX handling the scope for AP. Telescopes Change ), You are commenting using your Twitter account. Excellent review of the 127 ED and superb photos! At f/15, chromatic aberration is suppressed but still visible in achromatic refractors greater than about 90mm aperture. After several nights, I found this a suitable substitute for a fully rotating focuser housing, the one feature this instrument lacks. Anyway, thanks again for replying and taking time to do these reviews. Until relatively recently, apo refractors were five to eight times the price of similar aperture achromatic refractors. We put the LighTrack II from Fornax Mounts through its paces. I’m sure a more experienced star tester could find something I’m missing, but overall, the star test looks really good. I have indeed checked the collimation on the 6″ and it seems to be spot on. Just curious = ). The Explore ED127 telescope has a focal length of 952mm and an f/ratio of 7.5. Read how this new entry rates in our tests. It is 127 mm clear aperture (5”) … Also, if you check out my review of the AR152, I’ve taken some pretty decent images with it. And of course you know I want to have something that satisfies both Visual and AP lol So to sum up, yes, the 127ED does offer up a “prettier” view; however, if you’re happy with the 152 and you’re not planning on imaging, I’d stick with the 152. Everything about the AVX is more solid than the CG-5. Apochromatic lenses aim to dramatically or entirely eliminate this defect through the use of special extra-low dispersion (ED) glass. So again, if I was determined to upgrade instead of just keep what I had, I would go with the 127ED. I’m looking at about 1000.00 difference in price, is the performance of the 127ED over the 152mm worth the jump? It’s really hard to say, but for me, I would say yes. Thanks for the comment! The image of Tycho in the blog header was taken with the AR152. Refactors such as the Explore Scientific ED127 apochromat make great all-round instruments, suitable for both visual observing and astrophotography. The holiday season may tempt you to buy a telescope, but our expert advice will help you focus on what’s really important. On the night of the best seeing, at least four distinct darker regions presented themselves, including Mare Erythraeum and Mare Sirenum. The Sky-Watcher Pro 120ED is known to be a great performer with wonderful color correction, especially for a doublet, and comes with some nice accessories such as a 2″ diagonal, 9×50 RACI finder, and a metal case. Luckily, it only turned out to be one of the thumb screws used to adjust the focuser tension. counterweight is required to balance the scope in RA. I love it and the deep space views are excellent. So this is way past the 50% recommended load, so since you have the experience with this scope/mount how do you feel about it at this weight for AP? Personally, I would love to have a TEC 140, but given the cost I’m happy with the ES 127ED or Skywatcher 120 APO, both of which provide clean sharp views. I bought a AR152 about a year ago and mine like yours shows very little CA. Explore Scientific ED80 Review. I just bought a ES102APO before Christmas during the ES sale, couldn’t pass it up for their sale price! I am very happy with the AR152, and I bought the AR102 thinking it would be a great scope to eventually get into wide field AP with. M imaging I expected the big AR152 better than the ED127 star test very... 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