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.
I am new to using flats etc so probably something I've done wrong, but my light frames look they are being massively over-corrected for vignetting by my flats when I calibrate them (see pic attached of a calibrated light frame!). I've put an example of a light, flat and dark frame in this folder if anyone can help have a look and tell me if I've done something wrong? https://drive.google.com/drive/folders/1GffIM_bEM6-_ybE1NugnPy95oM_Wx_mC?usp=sharing Â
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I used an iPad with white light to do the flat frames by placing it directly over the lens - they looked good to me, if a bit underexposed. I created DNG files with the exposure brought up slightly to see if that made a difference but it didn't. The original raw file, and one DNG of the flat are in the folder above.Â
I'm using a Nikon D750 astro-modified and these were with sigma 28mm @ f/1.8 with ISO 1600 and 60 secs exposure.Â
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Any advice much appreciated!!
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You say you put the iPad directly over the lens... but do you then add a hood or dew shield for imaging? You must have the image train exactly as you image. I've found that dew shields and extension tubes can add stray light to the image if they are not flocked well enough. This can cause vignetting. The flat will unfortunately also contain this stray light but it must to properly calibrate the lights.
@astrogee didn’t use a lens hood or anything when taking lights, and then balanced the lens and camera on the iPad to take the flats - to me at least, the flat also looks about right for the vignetting in the light frame - but then it massively brightens the edges and darkens the middle for some reason?
Hi Callum, @cwhite939
You indicate : I've put an example of a light, flat and dark frame in this folderÂ
In this case, the overcorrection is not unexpected, you also need to add either bias or darkflats to have a correct calibration workflow. Did you use bias or darkflats as well?
Mabula
