MAY 4 2026: APP 2.0.0-beta44 has been released !
New improved internal memory controls should now work on all computers
May 1 2026: APP 2.0.0-beta43 has been released !
Improved internal memory controls (much more stable and faster on big datasets), fixed CPU image viewer, fixed Narrowband extraction demosaic algortihms.
Apr 29 2026 APP 2.0.0-beta42 has been released !
New improved Normalization engine, Fixed random crashes in integration, fixed RGB Combine & Calibrate Star Colors, fixed Narrowband extraction algorithms, new development platform with performance gains, bug fixes in the tools, etc...
Apr 14 2026: Google Pay, Apple Pay & WeChat Pay added as payment options
Update on the 2.0.0 release & the full manual
We are getting close to the 2.0.0 stable release and the full manual. The manual will soon become available on the website and also in PDF format. Both versions will be identical and once released, will start to follow the APP release cycle and thus will stay up-to-date to the latest APP version.
Once 2.0.0 is released, the price for APP will increase. Owner's license holders will not need to pay an upgrade fee to use 2.0.0, neither do Renter's license holders.
Hi there,
I hope you are doing great.
I wanna have some questions regarding Dark Frame Scaling.
I am a DSLR user and do Astro and Deepsky Astro for enjoyment. I know the limitations of uncooled DSLRs.
I understand all the basic concepts needed for this hobby. As summer here, DSLR sensors produce a lot of thermal noise and hot pixels. During winters, sometimes I never take dark frames but dither manually (i have a star tracker, but I can do it on both axis) as the temperature was 5-15 degrees below zero. I try to dither after every few frames no matter the season I shoot.
But now its summer/rainy humid season and now the temperature is approx 28C to 35C.
So, the point is, if I make a master dark for 50-100 frames with 5 min subs at ambient or room temperature (between 25-30C/ different night/day, can I use them for the whole summer season?
If yes, then what ISO should I pick? Does it matter for dark frame scaling? Or will it work if I make a master dark from my all darks that I have taken so far at different temperatures, seasons, sub-length, and ISO? what would be a good strategy?
Please share your experiences.
TIA
Hi Aditya,
yes you can use darfkrame libraries. As a rule of thumb, noise level doubles each time when temp raises by 7C on DSLRs. However, this relates to the sensor temp (which is more constant once the Cam is working a few min), not the environmental temp. The usual advise is to have masterdarks for each 2-3C steps, in Your case You could get waway with 28C, 31C and 35C and pick the closest. I think the scaling only works well with ISO & exposure time changes, which behave more linear, not with temp which is very non-linear and strongly depending on the Cam. Note: You need to renew the libraries once or twice every year.Â
Clear skies,
Jochen
@aditya_photos Adding to Jochen's excellent answer: dark frames need to have the same ISO as the lights and preferably also the same exposure time. If the exposure time is different then you'll need bias frames of the same ISO as well.
Wouter
