Luke Bellani
17-03-2012, 01:45 AM
Hi Guys,
I have now had a chance to come to grips with my new SX AO-L 'adaptive optics' unit and thought I would post same initial results and impressions.
Since I had an Orion SteadyStar AO unit before this one and posted a report on that, I thought that some may be interested in my initial results.
I purchased the unit from OPT in the USA. I have dealt with them several times before and have always been very happy as I was with this purchase.
The unit comes in a nice plastic foam lined case and first impression on opening the case was good.
All the necessary cables and lots of adapters that would suite most gear.
I used the 42mm T adapters to attatch the unit to my scope and camera.
I have a QSI583WS CCD camera and so got the AO unit that included the off axis guider (OAG).
The build quality of both the AO unit and OAG unit is very good.
It was very easy to assemble, fit to the scope's focuser and fit the QSI camera and Lodestar guide camera.
So everything went together very easily and when mounted to the scope, the fit was very solid and without any kind movement.
Still happy at this stage.
Then it was time to get it going and so I loaded the CD that is marked "Software and User Manual" into the PC drive.
There was no software on the disk only the manual PDF file.
Looking on the Starlight Instruments web site didn't help as SX has about the worst web site I have ever seen and so I couldn't find any reference to AO unit software anywhere obvious.
I dropped them an email and the reply was that I have to use the software that came with my Lodestar guide camera or MaxImDL to control the AO unit.
Bad luck if I didn't have a Lodestar guide camera or MaxImDL software, but fortunately I had both.
The software that came with the LodeStar camera is IMHO absolute rubbish and crashes if you as much as sneeze. The manual is totally out of date as well. So I fired up MaxImDL.
I had read the help files on using the SXAO unit with MaxIm earlier and so I had a head start there and managed to get it talking quite easily.
So then I proceeded to focus my main camera and that was OK and then focus the guide camera.
Here there was a snag.
There wasn't enough adjustment to alow the guide camera to reach focus and so that was that for the first night.
The next day I went out and found a set of C mount extender tubes that fitted OK and allowed me to get the guide camera focused the next night out.
So that I could isolate the AO and guide camera operation, I used two computers both running MaxImDL.
One to capture the image from the main QSI583WS camera and the other to get images from the guide camera and control the AO unit.
Apparently MaxImDL is not a multi-threaded program and so stops guiding during download of the main camera images.
I don't like this as the QSI camera takes about 20 seconds for a full resolution to download and so I will continue to use two PCs.
I did the same thing with the Orion SteadyStar and never had any problems that way.
I really like MaxImDL and have used it to capture images from my QSI camera for a couple of years now without any real issues.
However guiding is another matter.
Now my experience so far is that you can have a blazing star like Sirius in the middle of the image frame, but MaxIm will still try to select a hot pixel as the guide star.
Guide star selection is automated and the user cannot manually select the guide star.
A really dumb program feature in my opinion.
This forces you to take a series of dark frames and create dark frame groups in MaxIm for the guide camera to use.
Darks for all guide camera exposure times need to be taken and processed so that hot pixels can be removed from the camera image. This takes quite some time to do as exposures vary from about 100ms to seconds.
This has to be done otherwise your totally stuffed because MaxIm will select any hot pixels it finds regardless of how may real stars are in the image.
Well that has been my experience so far and this is the main reason I have always used the free PHD software to guide with.
It totally kills MaxIm for ease of use IMHO and doesn't sseem to have any problems with hot pixels.
Well eventually I managed to get everything working right and got both the AO and mount calibrated with the MaxIm AO control interface and away we went and guess what, it all worked very well. At first.
After a few AO starts and stops for different reasons and nothing to do with the AO unit, MaxIm couldn't connect to the AO camera any more and returned an obscure error message that it couldn't find camera number 3.
Now there is no such thing as camera number 3 and so this was a bit confusing and this is where having read everything I could get my hands on about the AO unit operation and having had an AO unit before was a great help.
As it turns out, if the AO unit's optical glass window that is used to perform the image corrections and is controlled by 4 stepper motors exceeds its normal range of travel, it can get jammed.
So... When MaxIm tries to centre the windows movement following the Connect button press by the user, it can't do it and so after a while of trying, it gives up and returns that stupid camera 3 error message.
By using a small screw driver to unjam the stepper motors (as per the instructions when you find them), MaxIm is happy and away we go again.
This problem I put down to teething issues and shouldn't be a real problem now that I understands its cause.
I don't expect it to happen very often.
Now for a couple of comparisons with the Orion SteadyStar AO unit.
As far as the build quality is conserned, the SXAO unit is better quality.
The Orion unit is OK but the OAG is a real piece of junk and lets the rest of the unit down badly.
A real stupid way for Orion to try to save a few dollars.
I had to make some significant mods to it before it was really useable.
That said, the Orion SteadyStar always worked very very well and I never had any issues with jamming stepper motors.
Although this possibility is mentioned in the SteadyStar user manual, the quality of which kills the really poor user manual for the SXAO unit.
Now where the SteadyStar kills the SXAO unit is in its control software.
The most important bit me thinks.
The SteadyStar control program although still needing improvemet, is excellent and very easy to use. Much easier to select guide stars than with MaxImDL.
I used my SteadyStar AO unit with the Lodestar guide camera for about a year and never once had any issues with the program selecting hot pixels when bright stars were available in the image.
It also has a facility to take guide camera dark frames when needed (if all stars are faint) and this very easy to do as well.
I could go on some more but I think I have said enough for now. At least unitl I use the SXAO some more. If the weather ever clears that is.
By the way, I didn't sell the SteadyStar because of any issues or dissatisfaction. I just wanted to a larger format unit and decided to try the Starlight Instruments SXAO-L unit.
Overall my initial impression of the unit itself is good, but the MaxImDL control software while easy to get going, is not easy that easy to use due to the issues of selecting hot pixels instead of real stars.
Going through the lengthy process of taking and processing guider dark frames largely resolves the hot pixels issue. But not completely.
I believe that MaxImDL now supports the SteadyStar as well, but if its guide star selection method is still the same, then I would just stick to the Orion control program.
Cheers,
Luke
I have now had a chance to come to grips with my new SX AO-L 'adaptive optics' unit and thought I would post same initial results and impressions.
Since I had an Orion SteadyStar AO unit before this one and posted a report on that, I thought that some may be interested in my initial results.
I purchased the unit from OPT in the USA. I have dealt with them several times before and have always been very happy as I was with this purchase.
The unit comes in a nice plastic foam lined case and first impression on opening the case was good.
All the necessary cables and lots of adapters that would suite most gear.
I used the 42mm T adapters to attatch the unit to my scope and camera.
I have a QSI583WS CCD camera and so got the AO unit that included the off axis guider (OAG).
The build quality of both the AO unit and OAG unit is very good.
It was very easy to assemble, fit to the scope's focuser and fit the QSI camera and Lodestar guide camera.
So everything went together very easily and when mounted to the scope, the fit was very solid and without any kind movement.
Still happy at this stage.
Then it was time to get it going and so I loaded the CD that is marked "Software and User Manual" into the PC drive.
There was no software on the disk only the manual PDF file.
Looking on the Starlight Instruments web site didn't help as SX has about the worst web site I have ever seen and so I couldn't find any reference to AO unit software anywhere obvious.
I dropped them an email and the reply was that I have to use the software that came with my Lodestar guide camera or MaxImDL to control the AO unit.
Bad luck if I didn't have a Lodestar guide camera or MaxImDL software, but fortunately I had both.
The software that came with the LodeStar camera is IMHO absolute rubbish and crashes if you as much as sneeze. The manual is totally out of date as well. So I fired up MaxImDL.
I had read the help files on using the SXAO unit with MaxIm earlier and so I had a head start there and managed to get it talking quite easily.
So then I proceeded to focus my main camera and that was OK and then focus the guide camera.
Here there was a snag.
There wasn't enough adjustment to alow the guide camera to reach focus and so that was that for the first night.
The next day I went out and found a set of C mount extender tubes that fitted OK and allowed me to get the guide camera focused the next night out.
So that I could isolate the AO and guide camera operation, I used two computers both running MaxImDL.
One to capture the image from the main QSI583WS camera and the other to get images from the guide camera and control the AO unit.
Apparently MaxImDL is not a multi-threaded program and so stops guiding during download of the main camera images.
I don't like this as the QSI camera takes about 20 seconds for a full resolution to download and so I will continue to use two PCs.
I did the same thing with the Orion SteadyStar and never had any problems that way.
I really like MaxImDL and have used it to capture images from my QSI camera for a couple of years now without any real issues.
However guiding is another matter.
Now my experience so far is that you can have a blazing star like Sirius in the middle of the image frame, but MaxIm will still try to select a hot pixel as the guide star.
Guide star selection is automated and the user cannot manually select the guide star.
A really dumb program feature in my opinion.
This forces you to take a series of dark frames and create dark frame groups in MaxIm for the guide camera to use.
Darks for all guide camera exposure times need to be taken and processed so that hot pixels can be removed from the camera image. This takes quite some time to do as exposures vary from about 100ms to seconds.
This has to be done otherwise your totally stuffed because MaxIm will select any hot pixels it finds regardless of how may real stars are in the image.
Well that has been my experience so far and this is the main reason I have always used the free PHD software to guide with.
It totally kills MaxIm for ease of use IMHO and doesn't sseem to have any problems with hot pixels.
Well eventually I managed to get everything working right and got both the AO and mount calibrated with the MaxIm AO control interface and away we went and guess what, it all worked very well. At first.
After a few AO starts and stops for different reasons and nothing to do with the AO unit, MaxIm couldn't connect to the AO camera any more and returned an obscure error message that it couldn't find camera number 3.
Now there is no such thing as camera number 3 and so this was a bit confusing and this is where having read everything I could get my hands on about the AO unit operation and having had an AO unit before was a great help.
As it turns out, if the AO unit's optical glass window that is used to perform the image corrections and is controlled by 4 stepper motors exceeds its normal range of travel, it can get jammed.
So... When MaxIm tries to centre the windows movement following the Connect button press by the user, it can't do it and so after a while of trying, it gives up and returns that stupid camera 3 error message.
By using a small screw driver to unjam the stepper motors (as per the instructions when you find them), MaxIm is happy and away we go again.
This problem I put down to teething issues and shouldn't be a real problem now that I understands its cause.
I don't expect it to happen very often.
Now for a couple of comparisons with the Orion SteadyStar AO unit.
As far as the build quality is conserned, the SXAO unit is better quality.
The Orion unit is OK but the OAG is a real piece of junk and lets the rest of the unit down badly.
A real stupid way for Orion to try to save a few dollars.
I had to make some significant mods to it before it was really useable.
That said, the Orion SteadyStar always worked very very well and I never had any issues with jamming stepper motors.
Although this possibility is mentioned in the SteadyStar user manual, the quality of which kills the really poor user manual for the SXAO unit.
Now where the SteadyStar kills the SXAO unit is in its control software.
The most important bit me thinks.
The SteadyStar control program although still needing improvemet, is excellent and very easy to use. Much easier to select guide stars than with MaxImDL.
I used my SteadyStar AO unit with the Lodestar guide camera for about a year and never once had any issues with the program selecting hot pixels when bright stars were available in the image.
It also has a facility to take guide camera dark frames when needed (if all stars are faint) and this very easy to do as well.
I could go on some more but I think I have said enough for now. At least unitl I use the SXAO some more. If the weather ever clears that is.
By the way, I didn't sell the SteadyStar because of any issues or dissatisfaction. I just wanted to a larger format unit and decided to try the Starlight Instruments SXAO-L unit.
Overall my initial impression of the unit itself is good, but the MaxImDL control software while easy to get going, is not easy that easy to use due to the issues of selecting hot pixels instead of real stars.
Going through the lengthy process of taking and processing guider dark frames largely resolves the hot pixels issue. But not completely.
I believe that MaxImDL now supports the SteadyStar as well, but if its guide star selection method is still the same, then I would just stick to the Orion control program.
Cheers,
Luke