https://youtu.be/UokrHNin980?si=SvbO2p88JXqVpr5Xexpensive though - here in Australia its only a tad cheaper than a RASA 8....
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Interesting…only 8.4 pounds with an incorporated filter drawer.
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The image circle is really tiny at 16mm. It seems like it could fill a niche for people seeking a portable fast scope but more interested in smaller FOVs than super widefield.
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Central obstruction with most of the APSC cámeras is high. It should be somewhere around 50%.  |
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I'm not sure that it's a good solution in this small of an aperture. as others have pointed out, it's a huge central obstruction with a cooled 585 camera coming in at over 50%. There is a price to be paid there with low system contrast. Because of all that the actual T-Stop of that system is f/2.7 without a filter. In actual light gathering power you have the equivalence of something smaller than a 120mm refractor.
An other area of concern is that the warm air shooting out of the camera cooler has to degrade the image, especially when it's trapped down inside the dew shield. If you've ever had your hand in front of a primary mirror on a test stand you'll know exactly what I'm talking about. In addition to that, you have the camera cable giving you wonky diffraction effects and you can't use a filter wheel.
I don't know, People do get good images out of larger versions these systems despite the built in shortcomings but in this small size? I think it's really pushing things. At the very least it would make more sense just to go with the 8".
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Tony Gondola:
I'm not sure that it's a good solution in this small of an aperture. as others have pointed out, it's a huge central obstruction with a cooled 585 camera coming in at over 50%. There is a price to be paid there with low system contrast. Because of all that the actual T-Stop of that system is f/2.7 without a filter. In actual light gathering power you have the equivalence of something smaller than a 120mm refractor.
An other area of concern is that the warm air shooting out of the camera cooler has to degrade the image, especially when it's trapped down inside the dew shield. If you've ever had your hand in front of a primary mirror on a test stand you'll know exactly what I'm talking about. In addition to that, you have the camera cable giving you wonky diffraction effects and you can't use a filter wheel.
I don't know, People do get good images out of larger versions these systems despite the built in shortcomings but in this small size? I think it's really pushing things. At the very least it would make more sense just to go with the 8". I use the RASA 8 and the images are very good. In fact, having the camera pushing air inside of the dew shield keeps the dew away without the need of a heater strap. I agree, that for 6" diameter and price there are other options like the sharp star F/ 2.8 or a 6" Carbon Star reflector with a reducer.
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Tony Gondola:
I'm not sure that it's a good solution in this small of an aperture. as others have pointed out, it's a huge central obstruction with a cooled 585 camera coming in at over 50%. There is a price to be paid there with low system contrast. Because of all that the actual T-Stop of that system is f/2.7 without a filter. In actual light gathering power you have the equivalence of something smaller than a 120mm refractor.
An other area of concern is that the warm air shooting out of the camera cooler has to degrade the image, especially when it's trapped down inside the dew shield. If you've ever had your hand in front of a primary mirror on a test stand you'll know exactly what I'm talking about. In addition to that, you have the camera cable giving you wonky diffraction effects and you can't use a filter wheel.
I don't know, People do get good images out of larger versions these systems despite the built in shortcomings but in this small size? I think it's really pushing things. At the very least it would make more sense just to go with the 8".
This scope is developed for the Celestron Origin smartscope and now is sold as an OTA or in a package with an AVX. It's not really ment to be used with cooled cameras to take long exposures.
You don't need to do long exposures with this fast scope anyways. 30 seconds should be enough and this also doesn't require autoguiding. An uncooled IMX585C is the perfect camera for this scope.
I would agree. I would think that something like the QHY5iii715C would be a good choice. With tiny 1.49 micron pixels you won't be giving up any resolution in good seeing and the obstruction would be a lot less. It might be very well suited for deep sky lucky imaging experiments.
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As something of a fast focal ratio connoisseur, I do not think the RASA6 is worth it. The CO is what it is and I think people tend to over blow that for deep space photography. However, the cost is just too high; it's like a few hundred dollars cheaper than a RASA8 ! That is kind of insane.
The only thing it has going for it is portability, but I would argue you are just better off getting a cheaper fast camera lens that has a reputation for producing solid astrophotos.
Also, people need to remember that the smaller the pixel size, the longer it takes to build SNR. If you are gonna spend 2k on a telescope, just get a quality refractor for the same price and a camera with bigger pixels.
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I for one am excited for this. I only get about 50 clear nights a year so speed definitely helps getting the most out of those. People have been using a C6 + hyperstar for years with good results so I don't see why this would suddenly be any different.
The reviews should be interesting.
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Dunk:
https://youtu.be/UokrHNin980?si=SvbO2p88JXqVpr5X
expensive though - here in Australia its only a tad cheaper than a RASA 8.... You should better say: "OMG - (at least) 46% obstruction! 77mm out of the 152mm are blocked - or practically even more cause of the bigger camera bodies.
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Michael von Berner-Purgstall:
Dunk:
https://youtu.be/UokrHNin980?si=SvbO2p88JXqVpr5X
expensive though - here in Australia its only a tad cheaper than a RASA 8....
You should better say: "OMG - (at least) 46% obstruction!
77mm out of the 152mm are blocked - or practically even more cause of the bigger camera bodies. It still has the light gathering power of a 128-ish mm refractor. Probably lower contrast but much faster. The CO is not as much of an issue as some make it out to be.
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Guillermo de Miranda:
I for one am excited for this. I only get about 50 clear nights a year so speed definitely helps getting the most out of those. People have been using a C6 + hyperstar for years with good results so I don't see why this would suddenly be any different.
The reviews should be interesting. Definitely see if any reviews mention tilt adjustment, because trying to image at F/2 without precise control over that is pretty much a non-starter.
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I've been using my "C6 RASA"–a C6 with Hyperstar and an ASI183MC Pro–for years, and I've had a great time with it. The RASA 6 might be a touch overpriced–it will come down over time–but it looks lightweight, convenient, and well made, and it will surely find an audience.
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