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Re: [MaxImDL] Re: Re Starlight Xpress AO and Loadstar


May 11, 2009

 


----------------------------

#36764 May 11, 2009

Hi All

>

>I tried the demo version of maxim a few months ago mainly to use with my AO unit and was very impressed with the fast and great way it handled

>the AO and mount Bump, But I had a few problems with calibration and before I consider the considerable investment I wonder if the following problems I was Having have been resolved ( Please tell me if I am wrong)

>

>1) Calibration of Ao and mount maxim would not let go a hot pixel ( Drove me mad )



Correct. Maxim loves hot pixels. You have to find a lone bright star in a near

empty field.

>

>2) Simple calibration ( Autodark) does not seem to work on AO screen



Correct. I have posted this before. It only works with SB unit.

>

>3) You cannot seem to manually pick guidestar as when you do it jumps back to hot pixel when you start calibration.



Yes - so do it as per earlier suggestion.

>

>I have read in previous posts if you pick a very bright star it will calibrate ok but does not seem a vary satisfactory way to do it



correct. >

>There seems to be 2 ways round this 1) let the user pick guide star or 2) get the autocalibration ( autodark) working



Ah - if only.........



I have raised these matters extensively before........



regards



Lawrence Harris

>

>For your info I am using a 14" F5 Newt

>

>

>Regards Harry Page



----------------------------

#36941 May 27, 2009

Lawrence Harris wrote:

> Correct. Maxim loves hot pixels. You have to find a lone bright star in a near

> empty field.



Oddly enough, there *is* code in the AO software to try and avoid hot pixels.

Apparently it is not sufficient.



We are going to try implementing the "Full Calibration" option into the AO

module. It requires a few hoops to be jumped through on our end. If all goes

well we should have something for you to try shortly.



Doug



---------------



Doug George

dgeorge@...



Diffraction Limited

Makers of Cyanogen Imaging Products

www.cyanogen.com



100 Craig Henry Dr., Suite 202

Ottawa, Ontario,

Canada, K2G 5W3



Phone: (613) 225-2732

Fax: (613) 225-9688



---------------



----------------------------

#36975 May 30, 2009

Posted by: "Douglas B. George" dg@... maximccd

> Date: Wed May 27, 2009 2:54 pm ((PDT))

>

>Lawrence Harris wrote:

>

>> Correct. Maxim loves hot pixels. You have to find a lone bright star in a near

>> empty field.

>

>Oddly enough, there *is* code in the AO software to try and avoid hot pixels.

>Apparently it is not sufficient.

>

>We are going to try implementing the "Full Calibration" option into the AO

>module. It requires a few hoops to be jumped through on our end. If all goes

>well we should have something for you to try shortly.

>

>Doug



Hi Doug



As you know, over the last year and more I have done a fair amount of testing

involving the hot pixel problem, and you and your colleagues have explained to

me the background. The solution of using a dark frame subtraction was ruled out

by you for the SX AO unit (you said it is only implemented for the SBIG unit)

and I was left with the understanding that you could not re-write the basic

algorithm because of the workload. OK - understood.



I cannot understand your "apparently it is not sufficient" comment? You already

knew that it doesn't work, so what causes this apparent 'surprise'?



Currently, all my equipment is in storage during a temporary house move. We are

scheduled to move into permanent accommodation in late July - and then I

re-build my observatory. I would hope to be in full operation before winter but

a lot has to happen before I am there. Others may be ready to help with the

testing. I would have been delighted to be involved from the beginning because

I suspect it was me that kept asking for a fix to this long-lived problem that

recent users seem to be now discovering.



Lawrence



----------------------------

#37231 Jun 24, 2009

Hello Doug,



is there any news yet concerning the hotpixel issue with the SX-AO unit? I'm considering such a unit for my CCD camera...



Many Thanks in advance,

Martin.

--- In MaxImDL@yahoogroups.com, "Douglas B. George" dg@...> wrote:

>

> Lawrence Harris wrote:

>

> > Correct. Maxim loves hot pixels. You have to find a lone bright star in a near

> > empty field.

>

> Oddly enough, there *is* code in the AO software to try and avoid hot pixels.

> Apparently it is not sufficient.

>

> We are going to try implementing the "Full Calibration" option into the AO

> module. It requires a few hoops to be jumped through on our end. If all goes

> well we should have something for you to try shortly.

>

> Doug

>

---------------

>

> Doug George

> dgeorge@...

>

> Diffraction Limited

> Makers of Cyanogen Imaging Products

> www.cyanogen.com

>

> 100 Craig Henry Dr., Suite 202

> Ottawa, Ontario,

> Canada, K2G 5W3

>

> Phone: (613) 225-2732

> Fax: (613) 225-9688

>

---------------

>







----------------------------

#37233 Jun 24, 2009

Hello Doug,



is there any news yet concerning the hotpixel issue with the SX-AO unit? I'm considering such a unit for my CCD camera...



Many Thanks in advance,

Martin.

--- In MaxImDL@yahoogroups.com, "Douglas B. George" dg@...> wrote:

>

> Lawrence Harris wrote:

>

> > Correct. Maxim loves hot pixels. You have to find a lone bright star in a near

> > empty field.

>

> Oddly enough, there *is* code in the AO software to try and avoid hot pixels.

> Apparently it is not sufficient.

>

> We are going to try implementing the "Full Calibration" option into the AO

> module. It requires a few hoops to be jumped through on our end. If all goes

> well we should have something for you to try shortly.

>

> Doug

>

---------------

>

> Doug George

> dgeorge@...

>

> Diffraction Limited

> Makers of Cyanogen Imaging Products

> www.cyanogen.com

>

> 100 Craig Henry Dr., Suite 202

> Ottawa, Ontario,

> Canada, K2G 5W3

>

> Phone: (613) 225-2732

> Fax: (613) 225-9688

>

---------------

>



----------------------------

#37236 Jun 24, 2009

picard8192 wrote: > Hello Doug,

>

> is there any news yet concerning the hotpixel issue with the SX-AO unit? I'm

> considering such a unit for my CCD camera...



The next update adds a "Full Calibration" option to the SX Universal plug-in.

That will allow you to take dark frames and use them to eliminate the hot pixels.



Doug



---------------



Doug George

dgeorge@...



Diffraction Limited

Makers of Cyanogen Imaging Products

www.cyanogen.com



100 Craig Henry Dr., Suite 202

Ottawa, Ontario,

Canada, K2G 5W3



Phone: (613) 225-2732

Fax: (613) 225-9688



---------------



----------------------------

#37244 Jun 25, 2009

I have seen that this is only a minimum problem. I have resolved

calibrating (it's necessary only one time, not every time you change

zone)with a very bright star.



Unfortunately It seems that under starlight AO and lodestar the program

doesn't dither. Please apologise me if I'm wrong, but it seems that the

guide is never stopped in order to do the guide dither. I hope this will

solved in next version.

Best regards

Mario



picard8192 ha scritto: > Hello Doug,

>

> is there any news yet concerning the hotpixel issue with the SX-AO unit? I'm considering such a unit for my CCD camera...

>

> Many Thanks in advance,

> Martin.

>

> --- In MaxImDL@yahoogroups.com, "Douglas B. George" dg@...> wrote:

>> Lawrence Harris wrote:

>>

>>> Correct. Maxim loves hot pixels. You have to find a lone bright star in a near

>>> empty field.

>> Oddly enough, there *is* code in the AO software to try and avoid hot pixels.

>> Apparently it is not sufficient.

>>

>> We are going to try implementing the "Full Calibration" option into the AO

>> module. It requires a few hoops to be jumped through on our end. If all goes

>> well we should have something for you to try shortly.

>>

>> Doug

>>

---------------

>>

>> Doug George

>> dgeorge@...

>>

>> Diffraction Limited

>> Makers of Cyanogen Imaging Products

>> www.cyanogen.com

>>

>> 100 Craig Henry Dr., Suite 202

>> Ottawa, Ontario,

>> Canada, K2G 5W3

>>

>> Phone: (613) 225-2732

>> Fax: (613) 225-9688

>>

---------------

>>

>

>

>



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