As promised I attach a low resolution spectrum of the daylight entering my observatory. It was taken while adjusting the spectrograph and includes the impact...
Hello Andrew Thanks for posting this. Very interesting. Is this sun light reflecting off some white surface, or is it the day time sky? Can you give a...
yes,the integrating sphere would be nice however, it would be bulky and non-practical to carry around for the aperture. I would like a 12" diameter sphere for...
Gary - It was done by just opening the observatory door and letting the daylight in (roof shut). The telescope mirror was uncovered and so most of the light...
Tim, you might find this more compact for PTCs http://www.ing.iac.es/Astronomy/observing/manuals/ps/tech_notes/tn108.pdf. You could replace the diodes with...
Andrew Thanks for all the really nice info you have posted… really good stuff On the LED thread: when I was posting the info about the “white light” LED...
Hello You guys are lucky, I need a 36 inch beach ball. For those who may not be familiar, the recommendation is to have an integrating sphere 3x the diameter...
Thanks Richard - I just wish I had your skies. In the NW UK I get 99.9% of the time with 100% cloud (these are made up statistics!). I have to drop everything...
I have an 18” f/12.6 classical cassegrain that needs help too…. From: FLI_Imaging_Systems@yahoogroups.com [mailto:FLI_Imaging_Systems@yahoogroups.com] On...
The offset error challenge is such an issue that Jim Janesick devotes about an hour of his PTC lecture to offset and read noise errors and how they screw up...
Hi, the flats of my ML8300 show a strong fix (not random) grid pattern and I ask, who can explain this effect. I've never seen this with my ST2K or ST402...
Richard - I have both the Photon Transfer book & his Scientific Charged-Coupled Devices. I have the utmost respect for his work and that that you have done...
I would like to understand the reasoning behind why a daylight/twilight spectrum is considered important. Obviously a light source needs to output sufficient...
the main reason Paul is that QE is wavelength dependent. in an extreme example you may have a sensor that has a significant blemish that only shows up at...
Hi Richard, I saw some specialty LED lamps that were using a combination of LEDs to create sunlight. Not sure what the spectrum might be like, but they were...
I have this same pattern with mine. I thought it had something to do with the pixels and readout, micro lenses or something, but maybe someone could explain...
This was one of my comments to Richard, need to add section showing examples of different FPNs you can get on CCD sensor. I am not sure but, I believe these...
I have found that others are seeing the same exact pattern in the QHY8 and QHY9 cameras. The QHY9 is an 8300 chip I believe, so I wonder if it is the MiroLens...
For doing PTC a smaller opaque sphere which is white inside is what is needed. BTW: This is really great discussion on this group! Thanks to all who partake! ...
I cannot see it for some reason, can you put the file in the files section of the fli yahoo group? Most likely it is blocky patterns that are fixed from frame...
I can't access the photos either. Sometimes I have a vertical line pattern that appears on my ML11002 CCD. A discussion with FLI indicated that it could be...
I added a flat to my Photo Album as well, but it awaits approval before it will show. This is a JPG of a full flat, not the greatest quality, but it shows the...
Floyd You should make a folder in the files section with your name on it and put it there. No approvals needed: no automatic resizing to small resolution...
Hartmut: what is the file name? The links are not always funtional and I cannot access it using my iPhone Did you look at the PDF I uploaded that illustrates...
