Instrumentation and Equipment

I'm working through the Basic CCD Testing section 8.2 of Richard's Image Processing book, applying the tests to my Canon Rebel T5.

I'm thinking that I have to add some wrinkles to the testing:
   - separate test series for different ISO's
   - Debayer the test images and do each color separately 

Other things I should look out for?

One thing I see with a quick test is that the darks look just like the bias shots... 
I'm wondering if the Canon is doing some tricks for me that I need to understand.

I received investment information for Optical Structures. They seem to be looking for pre-IPO investors with a goal of doing an IPO within 24 months.

While interesting, I have no idea how that relates to how they will continue, or not, to invest in new products such as photometric filters.

If anyone wishes the documents, I can email them to you.

Peter

I would like to know if dark frame scaling is possibile with new CMOS cameras in the event of a camera that shows zero amp glow such as the QHY600 or QHY268. Since the electronics of these new cameras are also very stable I wonder whether one could even skip master frames and just subtract one single dark frame of corresponding exposure or one single scalable dark after subtracting a single bias. Of course gain, offset and temperature match the ones of the calibrating frames.

Gianluca

We're open for questions and comments on my AAVSO How-To Webinar "Your First Observatory: Keep It Simple."

We'll post a link to the webinar on YouTube as soon as it becomes available. 

--Richard 

Hello All: I'm a beginner and this is my first post to an AASVO forum. I have searched for answers to the following questions and have found some. It would be a great help if you were to supply even just Y/N answers to any. I'll abide by the first answer to any question, but if you answer otherwise then I'll go scratch my head for a while. Anyway, thanks for reading this far!

I have a Takahashi CN212 on a Losmandy GM8 mount. The CN212 is  212mm f/12 true Cassegrain  convertible to a  212mm f/4 Newtonian.

I have made a response curve for my QHY294M camera. So i thought other with a Sony IMX492 sensor might benefit from it too.

For this I took flats of different exposure time and plotted the median and the maximum pixel read out against exposure time. I averaged the ADU count of 3 frames per exposure time.

As you see, for thethe sensor has a linear response up to about 62.000 of 65.535 ADU. This is linearity up to 95%, which is really good in my opnion. To be save I will expose my targets stars no further than 60.000 ADU in photometry (92%).

Hello,

I am doing photometry with a 90/500mm refractor and a Canon 450D. I consider to buy during the next 1-2 years a new telescope and camera. I do not want to go to big telescopes, maybe something like 8" maximum. But I wonder which type, Newton, SC,..., is best to use for photometry? I am not experienced with reflectors.

Thanks,

Matthias

Hi there,

first post here. I was wondering if it would be possible to use the Baader IR-Pass 610nm for exoplanet measurement? The band pass seems very close to the Astrodon Exoplanet cbb filter.

Thanks

Greetings,

I create a new post because I am interested in exoplanet/variable star photometry. I plan to use a QHY 6 cooled Mono CCD which is an excellent guiding camera and a very good entry level ccd for astrophotography. I want to ask if anyone has used this ccd camera for photometry and if yes,how good were your results? I do not expect precise/excellent results but I hope I will get some decent results until I manage to buy a very good Mono CCD camera.

Hi Folks -

Anyone using the Kepler 4040 (or any of the other 4040 chip makers).

If you have any, advice would be appreciated.   I know It's very sensitive and I am going live next weekend. 

I can't seem to find the search terms to see where people are talking about it.   I searched "4040" and nothing is coming up.   "kepler" seems gives me all the databases ... sorry to ask something that I know has been asked before. 

Best,

Joel