SolarChat!

p_zetner

Nice shots, Lou.
This AR has turned into a very photogenic target.
Cheers, Peter.

p_zetner

I like your capture of the AR especially. Very nice.

Cheers, Peter.

p_zetner

Nice disks, Eric. You captured a “keeper” despite the uncooperative weather.
Cheers, Peter.

p_zetner

Nicely detailed disk, Mark. It would be interesting if this AR developed into something more complex. Not sure how they generally evolve.

Cheers, Peter.

p_zetner

Greetings Everyone. I was hoping for some improved seeing conditions at a new location but the jet stream had other ideas! Despite many useless videos, I did manage to get the occasional improvement in seeing and was able to produce images of the weak active region near the E limb. Imaging of the AR...

p_zetner

Interesting experiments with the sodium filter, Mark. Beautiful granulation.
Cheers, Peter.

p_zetner

What an impressive set of images, Christian. I find it a bit difficult to differentiate the 540nm and 500nm images as far as contrast is concerned. They both look amazingly crisp. I agree with Valery. The G band image is terrific with many bright points visible. Wonderful!

Cheers, Peter.

p_zetner

A lovely mini gallery here, Pedro.
The cake pan adapter is a favourite!

Cheers, Peter.

p_zetner

Nice renditions of these full disks. I always enjoy the proms with inverted disk.
Cheers, Peter.

p_zetner

Nice proms, David.
Cheers, Peter.

p_zetner

Very nice set of disks, Eric.
Cheers, Peter.

p_zetner

Beautiful shots, Alex. The surface and spicule "forest" looks amazing.
Cheers, Peter.

p_zetner

Amazing detail on the full disks, Alexandra. Lots of surface detail and thin wispy proms visible in the high resolution images.

Cheers, Peter.

p_zetner

Very nice shots, Franco.
Cheers, Peter.

p_zetner · Re: Solar Discs 9 July 2018 Very nice disks, Matt. Cheers, Peter.

Very nice disks, Matt.
Cheers, Peter.

p_zetner

Greetings Everyone. I thought I would add some information about the latest telecentric lens I've designed for use with a C8 Edge. The telecentric magnification is about 4.4 with a (design) field angle of 0.012 degrees. My design goals were to keep the lens train as short as possible and use off the...

p_zetner

Not to contradict Valery, but I’ve used the Baader uv/ir cut filter as ERF for the Daystar QPE0.6A on a 100mm f12 (Istar objective) with no problems. Daystar has recommended the use of full sized ERF for objective diameters larger than 100mm. A front mounted ERF is the best solution, especially as i...

p_zetner

Wow! A mesmerizing animation with so much detail in the prominences and the spicule layer .... especially at the start of the sequence. Very beautiful.
Cheers, Peter.

p_zetner

Hi Valery. Your new filter is certainly capable of some superb imaging! These images look to have a bandpass of 0.4A or less and I don't think I can see any "print through" of the photospheric granulation (maybe a hint of it?). Are you developing this for the market? If so, hopefully you'd...

p_zetner

Here's an example of vignetting with f46 at the Daystar filter and focal reduction to about f25.
Stacked, deconvoluted, sharpened image on the left, contrast enhancement on the right.
(No flat fielding!)

Cheers, Peter.

: Sun_120252_vignette_example.png (1.24 MiB) Viewed 1218 times

p_zetner

Thanks Franco and David. David: My motivation for using a high magnification telecentric comes from the calculations of Christian Vladrich ( http://www.astrosurf.com/viladrich/astro/instrument/solar/FP.htm ), in partricular this figure: http://www.astrosurf.com/viladrich/astro/instrument/solar/FWHM-...

p_zetner

Thanks everyone for your very kind comments!
Valery: You’re right. There is more detail visible with the reduced exposure, although it still looks a touch too dark on my (uncalibrated) monitor. I have to control my inclination to push the contrast too far!

p_zetner

Greetings Everyone.

My contribution to the inspiring collection of proms on display here!

Cheers, Peter.

: Sun_1018064244_bkg-sub_ImPPG_shrp_proc0.png (1.07 MiB) Viewed 1256 times

p_zetner

Very nice shots, Brian.

Cheers, Peter.

p_zetner

Terrific proms!

Cheers, Peter.

p_zetner

Unbelievable and inspiring images, Valery. You set the bar very high!

Cheers, Peter.

p_zetner

Superb granulation shots, Stu.

Cheers, Peter.

p_zetner

Another fine collection of full disks, Pedro.

Cheers, Peter.

p_zetner

Very nice proms.

Cheers, Peter.

p_zetner · Re: Sol 29-6-2018 Ha Lovely full disks. Cheers, Peter.

Lovely full disks.

Cheers, Peter.

p_zetner

Very nice shots, Lou. Probably quite the battle against seeing!

Cheers, Peter.

p_zetner

Beautiful full disks, Eric.

Cheers, Peter.

p_zetner

Hello Everyone. A long absence but I'm getting my feet wet with solar imaging again. I've invested in a C8 Edge scope and Point Grey camera with IMX174 CMOS chip so I'm looking forward to high frame rates and some success with high resolution imaging. Here are some first light shots. There's not muc...

p_zetner

Thanks everyone.

I wish I’d had the foresight to charge my camera battery fully and put together a mosaic. It was quite the spectacle.

Cheers.
Peter.

p_zetner

The weather here has been quite frigid lately with high temperatures near -20C. Low temperatures and low Sun definitely curtail imaging and observing but, on the plus side, we are occasionally treated to beautiful displays of atmospheric phenomena involving atmospheric ice crystals. Today, we could ...

p_zetner

Beautiful work, Stu!

Cheers.
Peter.

p_zetner

Greetings Everyone. I wanted to do some house cleaning before the beginning of 2018 and finish processing some spectroheliograms that have been, more or less, lying dormant since June. Here are images at four more wavelengths to accompany my 20Jun2017 hydrogen results in a previous thread. four-mont...

p_zetner

Some last words on the SHG lineshape function. Here is a figure showing model calculations of the line profile of a grating spectrometer for various slit widths. GaussBox siz.png These lineshape functions were calculated by performing a convolution of a box function representing the slit transmissio...

p_zetner

Dear Toshio;
Welcome to the forum and congratulations on your SHG imaging.
Cheers.
Peter.

p_zetner

Hi Christian. You got me interested in the SHG lineshape problem and I will do some more modelling calculations shortly! It seems pretty clear, though, that, under optimum conditions, the SHG lineshape will be Gaussian. For your interest in comparing the selectivity of a Gaussian vs Lorentzian line,...

p_zetner

Hi Christian. In answer to your questions: >>>As we go from -0.55A to +0.55A, could we say we have about 0.09 A shift between two successive images ? Yes, the change in wavelength between frames is 0.092A. >>>It seems to me that the three images close to the centre line are very similar. In other wo...

p_zetner

Amazing what you have accomplished, Wah!
Your latest result is easily as good as Druckmuller’s famous pictures.

Your Photoshop technique seems related to some of the multiresolution wavelet sharpening methods available in some image processing routines. Have you tried any of these?

Cheers.
Peter.

p_zetner

Hello Phil and Christian. Thank you both for your kind comments. There is more information about my SHG in a somewhat recent article I wrote for the Spectroscopy section of the "Amateur Astronomy Association Germany (VdS)". The article is in Spektrum No.52 - 2017 ( http://spektroskopie.fg-...

p_zetner

That is an impressive and exciting piece of equipment, Stu! First results look very promising. Now comes the long wait for better spring / summer seeing. Looking forward to your progress.

Cheers.
Peter.

p_zetner

Hi Phil. Many thanks for your visit and comments. As far as your questions go: - What is the original size of the disk (height in pixels) ? The original disk size in vertical (non-dispersive) direction is ~ 2050 px. - Do you work with capture in 8, 10, 12 bits ? At the moment, I only use 8-bit depth...

p_zetner

What an incredible capture, Stu! I always thought it was just charged particle flux that messed with the magnetosphere. This UV effect is amazing!

Cheers.
Peter.

p_zetner

Beautiful work, Wah.

Love the spectrum .... that beautiful coronal iron line!

Peter.

p_zetner

Beautiful animations.

Peter.

p_zetner

Beautifully done!

Those off-band loops are stunning .... what a catch!

Peter.

p_zetner

Nice shots, Brian.

Peter.

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