8 отзывов пользователей o Coronado H-альфа PST
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Coronado H-альфа PST?
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Николай Капустин
02.06.2020
8/10
Оценка пользователя
Хорошо
Хорошая модель
- + Простота – хочется наблюдать солнце, пожалуйста!
Цена – это один из самых дешевых специализированных солнечных телескопов. Все остальное сильно дороже.
Компактен и лёгок - - – ЦЕНА! В РФ цена неадекватная. Ничем оправдать ее нельзя. Проще заказать из зарубежных магазинов и оплатить пошлину + доставку. Будет все равно в 2,5 раза дешевле.
– Слабая комплектация, нет ни штатива, ни креплений. В комплекте только 18мм окуляр Плессла (правда очень качественный)
В РФ покупать такое смысла нет. Цена поставлена с потолка. В известном зеленом магазине США можно купить в 3 раза...
Вячеслав Виноградов
18.01.2020
2/10
Оценка пользователя
Ужасно
Очень плохая модель
- + Уникальный инструмент. Чудо оптической мысли.
E. Schwartz
09.01.2021
10/10
Оценка пользователя
Великолепно
First, the double stacked 0.5A PST is the 1.0A PST with a second, removable etalon that attaches in front of the scope. They arrive in the same shipping carton, but with separate boxes inside; the external etalon has its own foam-lined plastic carrying case. (It is possible to upgrade the 1.0A PST by buying a Coronado SolarMax 40 external etalon later. You wind up with essentially the same instrument). The upside of the double stacking is better surface detail; the downsides are a dimmer image with less detail of prominences, higher cost, reduced portability (you have to carry around the separate etalon, it comes with its own case for a reason, and the telescope won't fit in the PST case with it installed), some reduction in mounting options (the second etalon is heavy, and way out on the moment arm of the objective, so inexpensive photographic tripods won't hold it well), and more difficulty tuning it for good viewing. The dimness and loss of prominence detail are relatively insignificant, as you can just leave off the second etalon when you want to see the prominences better. Even with it off, or a single etalon PST, what can be seen is amazing.
I should in fairness caution I'm still in the learning curve; it's very different from a night sky telescope. The Sun is 93,000,000 miles away, give or take, and it's huge, so focus is trivial. I have read a number of reviews that point out that the focus is very unusual; it moves the prism rather than the lenses. But the PST is made for looking at a specific object that's within a very narrow distance range from Earth, so focus is really not a big consideration. It's not like Jupiter which can be anywhere from one Jupiter orbit minus one Earth orbit away, to nearly one Jupiter orbit plus one Earth orbit away. And while finding an obscure but interesting star like VY Canis majoris isn't easy, if you can't find the Sun... Pointing the PST directly at the Sun is not completely trivial, but the built-in sun finder works very well. The main challenge is tuning the etalon(s) to compensate for temperature, etc., so that the etalon's actual bandpass (which changes slightly as it heats up) is not directly on the H-alpha wavelength, but is compensated for the Doppler shift of the H-alpha light from the rotating Sun. So, tuning the single etalon PST is very different from night sky astronomy. But it's not very hard. I think anyone will get the hang of it the first time out. You just find the right spot, then make tiny adjustments as the telescope warms up, or to tune in specific details on the approaching or receding side of the Sun. My main recommendation is to give the factory setting a try and let your eyes adapt, before you try tuning it. Truly getting an eye for H-alpha viewing is said to take about three months; I don't think it's that long, but maybe two more months from now I'll see details I don't even know exist yet. Even on day 3 what I could see without the external etalon was much more than what I could see on day 1. And even by sunset on day 1 I had no regrets about getting a PST, other than not having done it sooner. But installing the external etalon made the viewing worse, and I could not get a satisfactory image. With not much time before sunset I took it back off and enjoyed it with only the internal etalon.
However, any doubts I had about getting the double stacked PST vanished last week. With the external etalon not installed, the Sun wasn't doing much, just a few prominences. So I figured I would get some more experience trying to tune the second one. I want to thank an old forum post by Mike Taormina, who suggested that each instrument has a specific sweet spot in the T-max tuner (that's the adjustment that matches the two etalons so their bandpasses overlap). I found mine's sweet spot was about half a turn shy of fully open. Once found, it doesn't seem to vary for the same telescope. Then tuning the external etalon itself wasn't any harder than tuning the internal one. Tune the internal etalon to the feature you want to see best, then tune the external etalon to make it show up even better. And then suddenly the Sun that "wasn't doing much" was doing so much more than I thought. I could still see all the prominences though dimmer than without the external etalon, and a lot of new features: several bright plages (including one that was driving one of the prominences); two filaments I couldn't see before, the rolling boil (or orange-peel) texture of the surface for the first time; and everything including what I could see before was sharper. So I strongly recommend the double stacked PST if it's in your budget. It will be frustrating at first, but it's worth it. But if the single stacked PST is all that's in your budget, it's also worth it.
I should in fairness caution I'm still in the learning curve; it's very different from a night sky telescope. The Sun is 93,000,000 miles away, give or take, and it's huge, so focus is trivial. I have read a number of reviews that point out that the focus is very unusual; it moves the prism rather than the lenses. But the PST is made for looking at a specific object that's within a very narrow distance range from Earth, so focus is really not a big consideration. It's not like Jupiter which can be anywhere from one Jupiter orbit minus one Earth orbit away, to nearly one Jupiter orbit plus one Earth orbit away. And while finding an obscure but interesting star like VY Canis majoris isn't easy, if you can't find the Sun... Pointing the PST directly at the Sun is not completely trivial, but the built-in sun finder works very well. The main challenge is tuning the etalon(s) to compensate for temperature, etc., so that the etalon's actual bandpass (which changes slightly as it heats up) is not directly on the H-alpha wavelength, but is compensated for the Doppler shift of the H-alpha light from the rotating Sun. So, tuning the single etalon PST is very different from night sky astronomy. But it's not very hard. I think anyone will get the hang of it the first time out. You just find the right spot, then make tiny adjustments as the telescope warms up, or to tune in specific details on the approaching or receding side of the Sun. My main recommendation is to give the factory setting a try and let your eyes adapt, before you try tuning it. Truly getting an eye for H-alpha viewing is said to take about three months; I don't think it's that long, but maybe two more months from now I'll see details I don't even know exist yet. Even on day 3 what I could see without the external etalon was much more than what I could see on day 1. And even by sunset on day 1 I had no regrets about getting a PST, other than not having done it sooner. But installing the external etalon made the viewing worse, and I could not get a satisfactory image. With not much time before sunset I took it back off and enjoyed it with only the internal etalon.
However, any doubts I had about getting the double stacked PST vanished last week. With the external etalon not installed, the Sun wasn't doing much, just a few prominences. So I figured I would get some more experience trying to tune the second one. I want to thank an old forum post by Mike Taormina, who suggested that each instrument has a specific sweet spot in the T-max tuner (that's the adjustment that matches the two etalons so their bandpasses overlap). I found mine's sweet spot was about half a turn shy of fully open. Once found, it doesn't seem to vary for the same telescope. Then tuning the external etalon itself wasn't any harder than tuning the internal one. Tune the internal etalon to the feature you want to see best, then tune the external etalon to make it show up even better. And then suddenly the Sun that "wasn't doing much" was doing so much more than I thought. I could still see all the prominences though dimmer than without the external etalon, and a lot of new features: several bright plages (including one that was driving one of the prominences); two filaments I couldn't see before, the rolling boil (or orange-peel) texture of the surface for the first time; and everything including what I could see before was sharper. So I strongly recommend the double stacked PST if it's in your budget. It will be frustrating at first, but it's worth it. But if the single stacked PST is all that's in your budget, it's also worth it.
Richard L. Tyson
09.01.2021
10/10
Оценка пользователя
Великолепно
For years I always wanted a Hydrogen Alpha Telescope and now I finally have one. I took the plunge and ordered a Coronado 40mm, .5A PST from Amazon and I got it just in time for Christmas. This is the “double stacked” PST which is supposed to give better views of Sun in Ha light. This scope does not disappoint.
On Christmas Day I was able to set the scope up on my TV Panoramic Mount so I could test it as the basic scope, single stacked. All I can say is I was quite impressed as I could easily see a number of bright prominces on the eastern side of the solar disc and a small promince on the western side of the sun. Subtle amounts of details were noted on the surface and at least one small sunspot was noted plus Filaments and Plage, some granulation was also seen during moments of steadier seeing.
I first used the 20mm EP, (20x), provided and it gave excellent views once the scope was focused and adjusted. I noticed that as the scope adjusted to outside temperatures that images continued to improve. I then decided to try my TV 7mm Nagler EP, (57x), and the views thru this EP were also excellent. The extra magnification bought out more details not seen at 20x. A lot also depended on seeing conditions. Overall the single stacked PST is a most impressive scope.
The next day I tried the scope both single and double stacked and the results were amazing. With the scope double stacked features on the sun seemed to jump out at me. Filaments were much darker, Plage were definitely brighter with one active region being extremely bright. Granulation was easier to see over most of the solar disc. Prominces looked about the same as originally viewed but they were quite small so it was hard to tell. Overall contrast was improved.
I then tried my 7mm EP and a 16mm EP, on the double stacked scope, but I found the image seemed too dim. At this point the 20mm EP gave the best views with the double stacked scope. What is interesting is that the FOV has a “sweet spot” where details really stand out. This seems to be toward the center of the FOV.
My one big problem with the double stacked PST is that it becomes very top heavy, as the #SME-40 must be threaded into the front of the scope, so now I need to figure out how to remount the scope on my mount. Other then that I really love the PST.
On Christmas Day I was able to set the scope up on my TV Panoramic Mount so I could test it as the basic scope, single stacked. All I can say is I was quite impressed as I could easily see a number of bright prominces on the eastern side of the solar disc and a small promince on the western side of the sun. Subtle amounts of details were noted on the surface and at least one small sunspot was noted plus Filaments and Plage, some granulation was also seen during moments of steadier seeing.
I first used the 20mm EP, (20x), provided and it gave excellent views once the scope was focused and adjusted. I noticed that as the scope adjusted to outside temperatures that images continued to improve. I then decided to try my TV 7mm Nagler EP, (57x), and the views thru this EP were also excellent. The extra magnification bought out more details not seen at 20x. A lot also depended on seeing conditions. Overall the single stacked PST is a most impressive scope.
The next day I tried the scope both single and double stacked and the results were amazing. With the scope double stacked features on the sun seemed to jump out at me. Filaments were much darker, Plage were definitely brighter with one active region being extremely bright. Granulation was easier to see over most of the solar disc. Prominces looked about the same as originally viewed but they were quite small so it was hard to tell. Overall contrast was improved.
I then tried my 7mm EP and a 16mm EP, on the double stacked scope, but I found the image seemed too dim. At this point the 20mm EP gave the best views with the double stacked scope. What is interesting is that the FOV has a “sweet spot” where details really stand out. This seems to be toward the center of the FOV.
My one big problem with the double stacked PST is that it becomes very top heavy, as the #SME-40 must be threaded into the front of the scope, so now I need to figure out how to remount the scope on my mount. Other then that I really love the PST.
Raj K. Dixit
09.01.2021
8/10
Оценка пользователя
Хорошо
H-Alpha scopes are not cheap, so when I saw this on sale on Amazon, I knew I had to snap it up. I don't regret it. It does provide views of prominences on the Sun, and surface details (granulation) are faintly visible as well. Be advised that this is a 40mm H-Alpha telescope, so the image is quite small and dim. In my opinion, this is best for prominences - for surface details, you need more aperture - 80-90mm. Although this scope came with a second screw-on/off etalon for enhanced surface detail, I haven't used it because (1) in my experience, double-stacking etalons makes the image too dim, even in a 90mm H-Alpha scope; and (2) I would rather see prominences anyway - for sunspots (haven't been any for a while) are better seen in a regular scope with a white-light filter anyway, and the same is true for transits, such as the recent Mercury transit.
This is a good scope, but keep in mind its limited aperture - that way, your expectations won't be too high. The etalon and focuser are easily adjustable, though fine-tuning is somewhat tricky - just when you think you have it perfectly dialed in, it changes suddenly, due to the constant turmoil of changing conditions both on the Sun and in our own atmosphere. Also, you need a sturdy photo tripod / astronomical alt-az mount, with a binocular L-bracket adapter, in order to mount and use this scope. The included eyepiece is not that great; I get better results with 9 or 10 mm widefield (66 degree) oculars.
Still, this is a worthy purpose for those who want to take their first steps into H-Alpha solar viewing. For what it is and does, and at the price for which I was able to get it, it's definitely a good buy. Recommended, with the above caveats.
This is a good scope, but keep in mind its limited aperture - that way, your expectations won't be too high. The etalon and focuser are easily adjustable, though fine-tuning is somewhat tricky - just when you think you have it perfectly dialed in, it changes suddenly, due to the constant turmoil of changing conditions both on the Sun and in our own atmosphere. Also, you need a sturdy photo tripod / astronomical alt-az mount, with a binocular L-bracket adapter, in order to mount and use this scope. The included eyepiece is not that great; I get better results with 9 or 10 mm widefield (66 degree) oculars.
Still, this is a worthy purpose for those who want to take their first steps into H-Alpha solar viewing. For what it is and does, and at the price for which I was able to get it, it's definitely a good buy. Recommended, with the above caveats.
Francisco Melgar
09.01.2021
10/10
Оценка пользователя
Великолепно
I really love this telescope. The views are amazing!!
I HIGHLY recommend that if you are going to photograph the sun you buy a MonoChrome camera. The detail is better. I have both types and is better.
But overall, the rich view system and the color is great of this telescope!! Extremely fun!!!
And YES Without the Second filter this would be so so, because so much detail would be lost.
All of the pictures were taken with my monochrome Camera and some false color on photoshop with sharpening.
I HIGHLY recommend that if you are going to photograph the sun you buy a MonoChrome camera. The detail is better. I have both types and is better.
But overall, the rich view system and the color is great of this telescope!! Extremely fun!!!
And YES Without the Second filter this would be so so, because so much detail would be lost.
All of the pictures were taken with my monochrome Camera and some false color on photoshop with sharpening.
Armand Brucker
09.01.2021
10/10
Оценка пользователя
Великолепно
I bought this primarily for use during the upcoming August 2017 eclipse. Because solar maximum occurred in 2014 with less than the hoped-for amount of activity, and conditions are even less favorable now, I didn't hold out much hope for spectacular views through such a tiny scope. I was wrong! During the very first session with the little scope, prominences were immediately and clearly visible--and that was without double stacking using the second etalon. Using both etalons (one is internal to the scope and the other screws onto the front of the scope), the surface of the sun becomes alive with roiling patches and streaks of light and dark--the view is simply amazing!
Rose
09.01.2021
4/10
Оценка пользователя
Ужасно
Really bad focuser wobbles the pentaprism
buy a Daystar Scout 60 !
buy a Daystar Scout 60 !
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