Swansea Astronomical Society Blog

Tuesday, July 19, 2016

 

Solar Imaging with a DMK, H-alpha and Ca K-line solar scopes under Linux

More testing with Nicola's AstroDMx Capture for Linux. Using a DMK, a Solarmax ll 60, BF15 H-alpha scope and a CaK PST. Here is a screenshot plus some images. The captured AVIs were stacked and wavelet processed in Registax 5.1 running in the Wine, Windows compatibility layer. Post processing and colourising of the 16 bit Tiff produced by Registax, done in the Gimp 2.9, which can handle 16 bit, 32 and 64 bit files. Click on an image to get a closer view:

H-alpha images


Screenshot imaging in Ca K-line with a CaK PST

Ca K-line image

Nicola Mackin and Steve Wainwright
 

The solar disk in white light and with prominences in H-alpha light

A static tripod mounted Panasonic Lumix DMC-FZ72 bridge camera at 60x optical zoom, fitted with a Baader solar filter, was used to image the Sun. The camera was set to burst mode, ISO-100 and 1/1000s exposure at f/5.9. Images were captured in bursts of three. 96 images, precisely cropped and registered in Nicola Mackin's AstroCrop software were stacked and wavelet processed in Registax 5.1. Post processing was done in Photoshop. Click on an image to get a closer view:


An Opticstar PL-130M monochrome CMOS 1.3 mega-pixel USB camera was placed at the prime focus of a Solarmax ll, 60, BF15 H-alpha scope, mounted on an iOptron Cube Pro, AZ, GOTO mount. A 1200 frame AVI was captured, exposed for the disk and a 600 frame AVI exposed for the prominences. The AVIs were stacked and wavelet processed in Registax 5.1, post-processed, combined and colourised in Photoshop.


Steve Wainwright


 

Studies of the 99% full Moon using a 127mm, F=1500mm Maksutov a DMK camera and Nicola Mackin's AstroDMx Capture for Linux

The Moon was low in the sky and the seeing was bad. With Fedora Linux, Nicola Makin's AstroDMx Capture software was used to capture 1000 frame AVIs of different areas of the Moon with a DMK camera. The AVIs were stacked in Registax 5.1 running under the Wine Windows compatibility layer under Linux. Post processing of the resulting 16 bit TIFF files was done in the Gimp 2.9.

Screenshots showing the GUI and the separate image window


Tycho

Copernicus and Kepler

Plato and Sinus Iridum

The cheap ELP HD, USB board camera was used in grey-scale mode at a resolution of 640 x 480, using the reported uncompressed video stream, to image two regions of the Moon.


Gassendi region

Notwithstanding the poor seeing conditions, which were improving by the time the ELP camera was connected, the resulting images were quite good and virtually free of compression artefacts.

Nicola Mackin and Steve Wainwright

Monday, July 18, 2016

 

Whole solar disk in H-alpha light

A Lunt 50mm H-alpha solar scope, an Altair GPCam mono camera and accompanying software, Altaircapture. Best 40% of 2000 frames stacked in Autostakkert2! Then wavelets in Registax 6 and unsharp mask and coloured in Photoshop CS3. Click on the image to get a closer view:


Anne Startup
 

The Sun imaged in H-alpha light with a DMK using Nicola Mackin's AstroDMx Capture software and a Solarmax II 60, BF15 H-alpha scope

Nicola's AstroDMx Capture Linux software is progressing and now captures AVIs as well as TIFFs. A DMK 21AU04 AS camera was connected to a Solarmax II 60, BF15 H-alpha scope with a x2 Barlow. The active regions were imaged by capturing 1000 frame AVIs at 60fps. The AVIs were stacked and wavelet processed in Registax running under the Wine, Windows compatibility layer. The resulting images were post processed and colourised in the Gimp 2.9, which can process the 16 bit TIFF files produced by Registax. Click on an image to get a closer view.

Screenshot of AstrDMx Capture in action, showing the GUI and image window

The active sunspot regions

A prominence

There is still a lot of work to be done, improving the GUI, removing AVI size restrictions, implementing colour capture in DFK cameras, etc. However, significant progress has been made to date in bringing the DMK, DFK, DBK series of Imaging Source cameras to Linux.

Nicola Mackin and Steve Wainwright

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