2026-10-09 APP 2.0.0-beta48 has been released !
This is mainly a bug fix release for the reported bugs in beta47. In addition it has a significant User Interface performance improvement noticable when you need to process 1000s of images in APP.
2026-10-03 APP 2.0.0-beta47 has been released !
This is a very big release... many code optimizations/rewrites, many parts of APP are much faster and more precise, especially star analysis and registration are much faster ! Big mosaics will go much faster 🙂
And we introduce a new preview filter, which includes the new Adaptive Deep Sky Stretch and a General Levels Stretch, this has been long over due. The old preview filter (the panel on the right side to stretch and preview your data) has not been updated for a couple of years and it is a critical part of any APP session.
Adaptive Deep Sky Stretch or ADSS is a much more intuitive stretch algorithm. It is also color preserving (which is a great new addition in itself ! ) which means that the highlights are no longer bleached, color is maintained from the linear data while stretching. You can simply stretch your data using the sky background level and signal width sliders which work much easier and more intuitive. You no longer need to fiddle with the old complicated sliders with zoom buttons. All the zoom buttons for the sliders are made redundant. And you can enter slider values in the slider value fields yourself. I will make a youtube video in the coming days to explain and fully introduce ADSS. Once the video is ready, it will be highlighted on the forum.
RGB Combine upgrade !. The RGB Combine Tool has been rewritten mostly. The tool is faster and easier to use and most importantly, the Luminance slider to inject a luminance channel or channels into the RGB composite is now working correctly. It no longer bleaches the RGB colors. Combined with the new ADSS preview, you will get much better and easier great composites with great color! I will also explain this in a new youtube video.
Topic starter
August 7, 2019 21:34
My image of the nebula region around the star Sadr in the constellation Cygnus. The pictures were taken on four nights with a TS-Photoline APO 360mm, using a UHC clip filter for my EOS 750Da. The total exposure time is 6 hours, which consists of 60s and 180s lights.
I hope you like it 😉Â
Clear skies, Stefan
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artem reacted
August 8, 2019 09:05
Yes, lots of details. I'm missing a bit of color though, this filter shouldn't supress too much color right?
Topic starter
August 8, 2019 12:10
I am quite satisfied with the result. It was the first time I used a UHC filter, so I can't judge yet if the filter suppresses the colors a bit. But that shouldn't be based on the filter's transmission curve.
The pictures were taken in July this year at a warm outside temperature. The chip temperature of my EOS 750Da was partly 29°C and the darks and flats of course have different temperatures. Of course this is not ideal for processing the pictures. This is the big disadvantage compared to a cooled CMOS camera.
The pictures were taken in July this year at a warm outside temperature. The chip temperature of my EOS 750Da was partly 29°C and the darks and flats of course have different temperatures. Of course this is not ideal for processing the pictures. This is the big disadvantage compared to a cooled CMOS camera.
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Maybe I should have experimented more with APP, but I don't have enough experience yet.
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Here are the technical data of the UHC filter:
- 97% transmission at 486nm (H-beta)
- 97% transmission at 496nm (OIII)
- 97% transmission at 501nm (OIII)
- 97% transmission at 656nm (H alpha)
- Optimum transmission position for devices with f/10 to f/3.5
- Passband: 480nm to 505nm and 645nm to over 700nm
- Homofocal with all other Astronomik filters
- Thickness of the filter: 1mm
- Not sensitive to moisture, not aging, scratch-resistant
- Fine-optically polished carrier material
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Transmission curve Astronomic UHC clip filter
August 8, 2019 12:19
Ah it blocks a decent amount, mainly for light polution purposes.
edit: no blue shouldn't be blocked. So interesting why that's not present here. Anyway, food for thought in a next attempt maybe. 😉 Could also be due to the exposure, if stars get saturated color is lost as well.
