Lives in China Hangzhou, China
Works as a Student
Joined on Aug 28, 2008


Total: 5, showing: 1 – 5
On photo Rho Ophiuchi Nebula Complex in the Astrophotography - Not The Milky Way challenge (5 comments in total)
In reply to:

Daniel Kkesi: How did you manage to get telescope time for HST? :)
Wile I like the winner, this is clearly a class above.

Just careful calibration and image processing. A dark site is also important.

Link | Posted on Dec 11, 2014 at 02:23 UTC
On photo Rho Ophiuchi Nebula Complex in the Astrophotography - Not The Milky Way challenge (5 comments in total)

Thanks for watching!

Link | Posted on Dec 11, 2014 at 02:22 UTC as 1st comment

This comparison with EMCCD, in my opinion, is biased. A large pixel can always beat a small pixel sensor given a equivalent QE and read noise. All single photon detection these days are using EMCCD or sCMOS. Canon should publish its QE curve, read noise and dark current data.

Link | Posted on Mar 5, 2013 at 00:07 UTC as 42nd comment
On article Canon launches EOS 60Da DSLR for astrophotography (229 comments in total)

Actually if you do the modification yourself by just removing inner IR absorption glass (Color correction Filter) while preserving the Dust reduction filter, you will have at least 4~5 fold gain in sensitivity at H-Alpha. The ICF in 20Da has only 80% transmittance instead of 99% for an dedicated astrophotographical modification.

Link | Posted on Apr 3, 2012 at 18:49 UTC as 29th comment | 1 reply
On article Kodak sells Image Sensor Solutions business (69 comments in total)

Kodak may not be a success in the commercial market, yet it provided numerous solutions for scientific instrument.
If you know astronomy, almost all affordable CCD cameras for amateurs and professionals use Kodak chip. Apogee, FLI, SBIG, some models from QHY and ATIK all use kodak CCD. Even the Illumina Sequencing Analyzer in my lab use the kodak CCD.
Though inferior in terms of read noise, and dark current compared to Sony, they provide all kinds of Black and White sensors in various format and pixel density. Sony only put its newest technology into high density sensor for cellphone and Point and shoot, instead of large pixel low light sensor. With the diffraction limited in place, the 24MP A77 is just another bad example.

Link | Posted on Nov 8, 2011 at 23:08 UTC as 8th comment | 1 reply
Total: 5, showing: 1 – 5