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RASA 8” & QHY163M

catadioptric
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#1 Marco Prunotto

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Posted 18 April 2019 - 01:01 PM

I just ordered a RASA 8” and I would like to image with my QHY163M. How should I connect that to the rasa to have the right spacing? can I use the filter holder of starizona/baader? Any suggestion welcome.

Best,
Marco


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#2 djdoud

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Posted 18 April 2019 - 01:55 PM

Hello,

 

The starizona filter holder is only for select zwo cameras.

https://www.highpoin...cameras-sfs-zwo

 

The baader filter drawer for RASA 8 is 13 mm spacing.

it is not for sale yet, but baader are posting pics of the testing, so hopefully soon

 

https://twitter.com/...279320601071617


Edited by djdoud, 18 April 2019 - 01:57 PM.

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#3 Marco Prunotto

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Posted 18 April 2019 - 04:55 PM

thank you djdoud, M


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#4 George N

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Posted 19 April 2019 - 10:13 AM

I attended a talk at NEAIC earlier this month given by a lady who has experience with both the 8-inch RASA and Hyperstar. Her conclusion - RASA is somewhat better (for imaging). She had a collection of beautiful work taken via both.

 

However, both she and at least one other RASA 8 owner in the audience mentioned that one of the 'pains' of using it is: changing filters while the dew shield is on! Both (like me and many) live where you can't use a Schmidt most nights without dew control. So, you need to be prepared to remove the dew shield between each filter change - and that means fiddling with wires, etc.


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#5 MikeMiller

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Posted 19 April 2019 - 10:20 AM

I attended a talk at NEAIC earlier this month given by a lady who has experience with both the 8-inch RASA and Hyperstar. Her conclusion - RASA is somewhat better (for imaging). She had a collection of beautiful work taken via both.

 

However, both she and at least one other RASA 8 owner in the audience mentioned that one of the 'pains' of using it is: changing filters while the dew shield is on! Both (like me and many) live where you can't use a Schmidt most nights without dew control. So, you need to be prepared to remove the dew shield between each filter change - and that means fiddling with wires, etc.

This is one of the reasons why I like my Hyperstar. It keeps the filter and camera a bit further away from the corrector. I also have the Starizona shorter aluminum dew shield, which is easy to reach in to swap filters. It also has notches for running cables through.

 

https://starizona.co...c8-edge-hd-1394

 

I also like that it is less floppy than the flexible ones. I use it when when not using Hyperstar. I keep it in a standard paint bucket for protection and transport.



#6 Marco Prunotto

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Posted 19 April 2019 - 11:19 AM

any images of RASA with QHY163M so far available?

best regards,
Marco


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#7 Ladyhawke

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Posted 19 April 2019 - 11:26 AM

I attended a talk at NEAIC earlier this month given by a lady who has experience with both the 8-inch RASA and Hyperstar. Her conclusion - RASA is somewhat better (for imaging). She had a collection of beautiful work taken via both.

 

However, both she and at least one other RASA 8 owner in the audience mentioned that one of the 'pains' of using it is: changing filters while the dew shield is on! Both (like me and many) live where you can't use a Schmidt most nights without dew control. So, you need to be prepared to remove the dew shield between each filter change - and that means fiddling with wires, etc.

Who was the lady? Anyway, she's right, switching filters is a huge inconvenience if you need to sleep and nearly impossible with a dew shield, that's why I am using my Hyperstar with a filter wheel. Never been happier!


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#8 Phil Cowell

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Posted 20 April 2019 - 06:02 AM

I attended a talk at NEAIC earlier this month given by a lady who has experience with both the 8-inch RASA and Hyperstar. Her conclusion - RASA is somewhat better (for imaging). She had a collection of beautiful work taken via both.

 

However, both she and at least one other RASA 8 owner in the audience mentioned that one of the 'pains' of using it is: changing filters while the dew shield is on! Both (like me and many) live where you can't use a Schmidt most nights without dew control. So, you need to be prepared to remove the dew shield between each filter change - and that means fiddling with wires, etc.

On the 11 I use a metal dew shield and it makes things much easier.


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#9 George N

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Posted 20 April 2019 - 02:41 PM

Who was the lady? Anyway, she's right, switching filters is a huge inconvenience if you need to sleep and nearly impossible with a dew shield, that's why I am using my Hyperstar with a filter wheel. Never been happier!

Right now my NEAIC stuff is still packed away, but I found this in NEAIC 2019 thread "Stephanie Anderson, overview of RASA and Hyperstar imaging"  And that is exactly what her well-presented talk was about. She as experience with both, with fine examples of using both. I'll have to look there to see if there is a posting of her bio PDF file - probably is.

 

Her suggestion - use a OSC camera on the RASA 8.

 

Her conclusion is also - she will continue to use both, but thinks RASA produces better images, but Hyperstar is a more flexible solution.

 

Personally, I'm surprised that Celestron has not come out with a RASA-8 specific camera - science grade CMOS chip, with physical size and pixel size optimized for the design. Considering the popularity of the RASA-8 I'm sure it is only time before we see such a camera. The RASA begs for a manufacturer included corrector plate dew system.



#10 George N

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Posted 20 April 2019 - 02:45 PM

On the 11 I use a metal dew shield and it makes things much easier.

 

Of course the RASA-11 gives more room to get one's fingers inside any dew shield.

 

With the 8, there's not a lot of room, and the filter drawer is smaller, and closer to the corrector and the camera. Not to mention that part of the idea behind the "8" is field use with a small and light-weight mount.



#11 Phil Cowell

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Posted 20 April 2019 - 02:53 PM

Right now my NEAIC stuff is still packed away, but I found this in NEAIC 2019 thread "Stephanie Anderson, overview of RASA and Hyperstar imaging"  And that is exactly what her well-presented talk was about. She as experience with both, with fine examples of using both. I'll have to look there to see if there is a posting of her bio PDF file - probably is.

 

Her suggestion - use a OSC camera on the RASA 8.

 

Her conclusion is also - she will continue to use both, but thinks RASA produces better images, but Hyperstar is a more flexible solution.

 

Personally, I'm surprised that Celestron has not come out with a RASA-8 specific camera - science grade CMOS chip, with physical size and pixel size optimized for the design. Considering the popularity of the RASA-8 I'm sure it is only time before we see such a camera. The RASA begs for a manufacturer included corrector plate dew system.

The old Nightscape 10.1MPixel would work well on the 8. For OSC I use the ATIK 4120EX on the 11.



#12 Phil Cowell

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Posted 20 April 2019 - 02:56 PM

Of course the RASA-11 gives more room to get one's fingers inside any dew shield.

 

With the 8, there's not a lot of room, and the filter drawer is smaller, and closer to the corrector and the camera. Not to mention that part of the idea behind the "8" is field use with a small and light-weight mount.

The Astrozap has screw that hold their metal dew shield. Easy to slacken off and lift up, change slide and replace and tighten. No problem on my Mach1 with movement. The Baader slide drawer is the same for both.


Edited by Phil Cowell, 20 April 2019 - 02:57 PM.



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