Re: QHY9C odd Behaviour question?


Oct 28, 2011

 


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

#47463 Oct 28, 2011

Hello Everybody,



I just started using Maxim for image capturing with my QHY9C, previously i was using Nebulosity.



First thing i noticed was that the Picture size is a bit different. Nebulosity reports: 3336x2496 and Maxim: 3348x2496 so my calibration images don't work any more :(.



The other thing is that, in the FITS header it reports Gain = 0 and Offset = 0, even though in ASCOM it says GAIN = 5 and Offset = 122. Nebulosity reports the correct numbers.



I wonder why this is?. And if i'm going to run in to problems later, are the images really at Gain = 0 and Offset = 0?. That wouldn't be good.



thank you for any advise,

Javier.



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

#47464 Oct 28, 2011

Make sure you don't have a subframe turned on, I did this by accident once

and had to create a new set of calibration frames to match the lights taken

with a subframe on. It was only one pixel smaller than full frame, but that

was enough to make calibration not work. I don't know about the gain and

offset.



Josh



On Fri, Oct 28, 2011 at 2:00 PM, Javier_Villarreal jvillarrealn@... > wrote:



> **

>

>

> Hello Everybody,

>

> I just started using Maxim for image capturing with my QHY9C, previously i

> was using Nebulosity.

>

> First thing i noticed was that the Picture size is a bit different.

> Nebulosity reports: 3336x2496 and Maxim: 3348x2496 so my calibration images

> don't work any more :(.

>

> The other thing is that, in the FITS header it reports Gain = 0 and Offset

> = 0, even though in ASCOM it says GAIN = 5 and Offset = 122. Nebulosity

> reports the correct numbers.

>

> I wonder why this is?. And if i'm going to run in to problems later, are

> the images really at Gain = 0 and Offset = 0?. That wouldn't be good.

>

> thank you for any advise,

> Javier.

>

>

>





[Non-text portions of this message have been removed]



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

#47465 Oct 28, 2011

Hello Josh,



Thank you, i will double check that subFrame is off.



Question, if you check your FITs header, does it shows the correct Offset and Gain, that is, does it shows the numbers you are putting into the ASCOM Driver?.



thank you

Javier.

--- In MaxImDL@yahoogroups.com, Josh Hufford joshhufford@...> wrote:

>

> Make sure you don't have a subframe turned on, I did this by accident once

> and had to create a new set of calibration frames to match the lights taken

> with a subframe on. It was only one pixel smaller than full frame, but that

> was enough to make calibration not work. I don't know about the gain and

> offset.

>

> Josh

>

> On Fri, Oct 28, 2011 at 2:00 PM, Javier_Villarreal jvillarrealn@...

> > wrote:

>

> > **

> >

> >

> > Hello Everybody,

> >

> > I just started using Maxim for image capturing with my QHY9C, previously i

> > was using Nebulosity.

> >

> > First thing i noticed was that the Picture size is a bit different.

> > Nebulosity reports: 3336x2496 and Maxim: 3348x2496 so my calibration images

> > don't work any more :(.

> >

> > The other thing is that, in the FITS header it reports Gain = 0 and Offset

> > = 0, even though in ASCOM it says GAIN = 5 and Offset = 122. Nebulosity

> > reports the correct numbers.

> >

> > I wonder why this is?. And if i'm going to run in to problems later, are

> > the images really at Gain = 0 and Offset = 0?. That wouldn't be good.

> >

> > thank you for any advise,

> > Javier.

> >

> >

> >

>

>

> [Non-text portions of this message have been removed]

>



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

#47466 Oct 28, 2011

I don't have Offset and Gain in my FITS header, but I'm using an SBIG

ST8300M. I don't think Sbig cameras have an adjustment for Offset and Gain?



Josh



On Fri, Oct 28, 2011 at 4:46 PM, Javier_Villarreal jvillarrealn@... > wrote:



> **

>

>

> Hello Josh,

>

> Thank you, i will double check that subFrame is off.

>

> Question, if you check your FITs header, does it shows the correct Offset

> and Gain, that is, does it shows the numbers you are putting into the ASCOM

> Driver?.

>

> thank you

> Javier.

>

> --- In MaxImDL@yahoogroups.com, Josh Hufford joshhufford@...> wrote:

> >

> > Make sure you don't have a subframe turned on, I did this by accident

> once

> > and had to create a new set of calibration frames to match the lights

> taken

> > with a subframe on. It was only one pixel smaller than full frame, but

> that

> > was enough to make calibration not work. I don't know about the gain and

> > offset.

> >

> > Josh

> >

> > On Fri, Oct 28, 2011 at 2:00 PM, Javier_Villarreal jvillarrealn@...

> > > wrote:

> >

> > > **

>

> > >

> > >

> > > Hello Everybody,

> > >

> > > I just started using Maxim for image capturing with my QHY9C,

> previously i

> > > was using Nebulosity.

> > >

> > > First thing i noticed was that the Picture size is a bit different.

> > > Nebulosity reports: 3336x2496 and Maxim: 3348x2496 so my calibration

> images

> > > don't work any more :(.

> > >

> > > The other thing is that, in the FITS header it reports Gain = 0 and

> Offset

> > > = 0, even though in ASCOM it says GAIN = 5 and Offset = 122. Nebulosity

> > > reports the correct numbers.

> > >

> > > I wonder why this is?. And if i'm going to run in to problems later,

> are

> > > the images really at Gain = 0 and Offset = 0?. That wouldn't be good.

> > >

> > > thank you for any advise,

> > > Javier.

> > >

> > >

> > >

> >

> >

> > [Non-text portions of this message have been removed]

> >

>

>

>





[Non-text portions of this message have been removed]







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

#47473 Oct 29, 2011

I have a QHY9C. I can confirm that the pixel dimensions are 3348x2496.



There are no values for offset and bias in the fits header.



Andrew



On 28/10/2011 22:49, Josh Hufford wrote:

> I don't have Offset and Gain in my FITS header, but I'm using an SBIG

> ST8300M. I don't think Sbig cameras have an adjustment for Offset and Gain?

>

> Josh

>

> On Fri, Oct 28, 2011 at 4:46 PM, Javier_Villarrealjvillarrealn@...

>> wrote:

>> **

>>

>>

>> Hello Josh,

>>

>> Thank you, i will double check that subFrame is off.

>>

>> Question, if you check your FITs header, does it shows the correct Offset

>> and Gain, that is, does it shows the numbers you are putting into the ASCOM

>> Driver?.

>>

>> thank you

>> Javier.

>>

>> --- In MaxImDL@yahoogroups.com, Josh Huffordjoshhufford@...> wrote:

>>> Make sure you don't have a subframe turned on, I did this by accident

>> once

>>> and had to create a new set of calibration frames to match the lights

>> taken

>>> with a subframe on. It was only one pixel smaller than full frame, but

>> that

>>> was enough to make calibration not work. I don't know about the gain and

>>> offset.

>>>

>>> Josh

>>>

>>> On Fri, Oct 28, 2011 at 2:00 PM, Javier_Villarrealjvillarrealn@...

>>>> wrote:

>>>> **

>>>>

>>>> Hello Everybody,

>>>>

>>>> I just started using Maxim for image capturing with my QHY9C,

>> previously i

>>>> was using Nebulosity.

>>>>

>>>> First thing i noticed was that the Picture size is a bit different.

>>>> Nebulosity reports: 3336x2496 and Maxim: 3348x2496 so my calibration

>> images

>>>> don't work any more :(.

>>>>

>>>> The other thing is that, in the FITS header it reports Gain = 0 and

>> Offset

>>>> = 0, even though in ASCOM it says GAIN = 5 and Offset = 122. Nebulosity

>>>> reports the correct numbers.

>>>>

>>>> I wonder why this is?. And if i'm going to run in to problems later,

>> are

>>>> the images really at Gain = 0 and Offset = 0?. That wouldn't be good.

>>>>

>>>> thank you for any advise,

>>>> Javier.

>>>>

>>>>

>>>>

>>>

>>> [Non-text portions of this message have been removed]

>>>

>>

>>

>

> [Non-text portions of this message have been removed]

>

>

>

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

>

> Yahoo! Groups Links

>

>

>



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

#47474 Oct 29, 2011

Thanks so much Andrew. I was worried that my images were being taken with gain and offset settings.



Clear skies

Javier --- In MaxImDL@yahoogroups.com, Andrew Luck andrew@...> wrote:

>

> I have a QHY9C. I can confirm that the pixel dimensions are 3348x2496.

>

> There are no values for offset and bias in the fits header.

>

> Andrew

>

>

> On 28/10/2011 22:49, Josh Hufford wrote:

> > I don't have Offset and Gain in my FITS header, but I'm using an SBIG

> > ST8300M. I don't think Sbig cameras have an adjustment for Offset and Gain?

> >

> > Josh

> >

> > On Fri, Oct 28, 2011 at 4:46 PM, Javier_Villarrealjvillarrealn@...

> >> wrote:

> >> **

> >>

> >>

> >> Hello Josh,

> >>

> >> Thank you, i will double check that subFrame is off.

> >>

> >> Question, if you check your FITs header, does it shows the correct Offset

> >> and Gain, that is, does it shows the numbers you are putting into the ASCOM

> >> Driver?.

> >>

> >> thank you

> >> Javier.

> >>

> >> --- In MaxImDL@yahoogroups.com, Josh Huffordjoshhufford@> wrote:

> >>> Make sure you don't have a subframe turned on, I did this by accident

> >> once

> >>> and had to create a new set of calibration frames to match the lights

> >> taken

> >>> with a subframe on. It was only one pixel smaller than full frame, but

> >> that

> >>> was enough to make calibration not work. I don't know about the gain and

> >>> offset.

> >>>

> >>> Josh

> >>>

> >>> On Fri, Oct 28, 2011 at 2:00 PM, Javier_Villarrealjvillarrealn@

> >>>> wrote:

> >>>> **

> >>>>

> >>>> Hello Everybody,

> >>>>

> >>>> I just started using Maxim for image capturing with my QHY9C,

> >> previously i

> >>>> was using Nebulosity.

> >>>>

> >>>> First thing i noticed was that the Picture size is a bit different.

> >>>> Nebulosity reports: 3336x2496 and Maxim: 3348x2496 so my calibration

> >> images

> >>>> don't work any more :(.

> >>>>

> >>>> The other thing is that, in the FITS header it reports Gain = 0 and

> >> Offset

> >>>> = 0, even though in ASCOM it says GAIN = 5 and Offset = 122. Nebulosity

> >>>> reports the correct numbers.

> >>>>

> >>>> I wonder why this is?. And if i'm going to run in to problems later,

> >> are

> >>>> the images really at Gain = 0 and Offset = 0?. That wouldn't be good.

> >>>>

> >>>> thank you for any advise,

> >>>> Javier.

> >>>>

> >>>>

> >>>>

> >>>

> >>> [Non-text portions of this message have been removed]

> >>>

> >>

> >>

> >

> > [Non-text portions of this message have been removed]

> >

> >

> >

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

> >

> > Yahoo! Groups Links

> >

> >

> >

>







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