Search found 593 matches

by oopfan
Sun Feb 25, 2018 2:15 pm
Forum: General Discussions
Topic: CMOS cameras with Full Well > 15ke-
Replies: 6
Views: 992

Re: CMOS cameras with Full Well > 15ke-

Yes, I saw the 174. Too bad its 12-bit and not 14-bit. The big pixels mean that I would have to swap in a focal extender or buy a longer refractor for photometry. It is never easy is it? The 290 works for now. It gives me 3.5 magnitudes of linearity with SNR > 100 in a single frame. I'll wait for th...
by oopfan
Sun Feb 25, 2018 9:43 am
Forum: General Discussions
Topic: CMOS cameras with Full Well > 15ke-
Replies: 6
Views: 992

Re: CMOS cameras with Full Well > 15ke-

Never mind. I see that ZWO has a handy comparison chart. Too bad that most desirable models are color.
by oopfan
Sun Feb 25, 2018 2:32 am
Forum: General Discussions
Topic: CMOS cameras with Full Well > 15ke-
Replies: 6
Views: 992

CMOS cameras with Full Well > 15ke-

Hi Robin,

Do you know of any sub-$1000 CMOS cameras that have a Full Well in excess of 15,000 electrons?

Thanks,
Brian
by oopfan
Fri Feb 23, 2018 12:08 pm
Forum: General Discussions
Topic: 10/12/14 bit FITS Natural Bit Depth
Replies: 16
Views: 2801

Re: 10/12/14 bit FITS Natural Bit Depth

May I add that this is important if you want to do science with your camera like photometry and spectrometry. To be successful at it you need to know the range of linearity of the sensor. If the SDK is stretching the image but SharpCap cannot unstretch it then you have a problem. Buyer beware.

Brian
by oopfan
Fri Feb 23, 2018 11:38 am
Forum: General Discussions
Topic: Calculating Well Depth
Replies: 1
Views: 460

Calculating Well Depth

Robin, I learned about a method by Berry and Burnell for calculating gain (e-/ADU) from two raw bias frames and two raw flat frames. Could you share the method for calculating Well Depth? I want to use a gain setting in between two settings in the Sensor Analysis. I'd like to know what the value is ...
by oopfan
Fri Feb 23, 2018 11:34 am
Forum: Bug Reports
Topic: Optional stretching of 12 bit s image saved using the FITS format
Replies: 3
Views: 625

Re: Optional stretching of 12 bit s image saved using the FITS format

Confirmed that saving image to native 12 bits works for Altair 290M.

Thank you.
by oopfan
Tue Feb 20, 2018 1:21 pm
Forum: General Discussions
Topic: 12-bit ADUs scaled to 0-65535 in FITS file
Replies: 2
Views: 614

Re: 12-bit ADUs scaled to 0-65535 in FITS file

Hi Robin,

You are right I was looking at a Dark image FITS file which came in less than 4095. For variable stars I think I will switch over to AltairCapture.

Thanks,
Brian
by oopfan
Mon Feb 19, 2018 11:16 pm
Forum: General Discussions
Topic: 12-bit ADUs scaled to 0-65535 in FITS file
Replies: 2
Views: 614

12-bit ADUs scaled to 0-65535 in FITS file

Hi Robin, At one point in the not-so-distant past SharpCap wrote ADU Counts in the range of 0-4095 for a 12-bit camera. That's now been changed to 0-65535 by multiplying the ADU Count by 16. This is causing a bit of a kerfuffle with my variable star endeavors at AAVSO, Everyone there uses a 16-bit C...
by oopfan
Sun Feb 18, 2018 5:29 pm
Forum: How do I?
Topic: SNR
Replies: 1
Views: 441

SNR

Hi Robin,

Is there a way to put a selection box around a star and ask SharpCap to calculate the signal-to-noise ratio just for a single frame?

Thanks,
Brian
by oopfan
Sun Feb 11, 2018 4:02 pm
Forum: General Discussions
Topic: Variable Stars with SharpCap 3.1
Replies: 2
Views: 651

Re: Variable Stars with SharpCap 3.1

Thanks, Robin. That's an excellent idea that takes advantage of the linearity of the sensor. I've attached a snapshot from C2A: The large red rectangle is my imaging FOV at 1920x1080 rotated -30 degrees. This orientation maximizes the capture of the most number of comparison stars. The small yellow ...