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krakatoa1883

Thanks Paul for help, thanks Alexandra and Mark for your kind comments.

krakatoa1883

Thanks to you all for your comments

krakatoa1883

Today I tried my very first (short) animation, it is very rough and uneven between single images, I hope to do better with practice. 5_2020-05-26-091403-0000_3_grad4_ap58_out crop_aligned.gif I read on the excellent guide " How to image the Sun " that "FireCapture can be set to take a...

krakatoa1883

Great, this is the kind of videos that show the Sun a true living creature!

krakatoa1883

Granulation has been captured very well!

krakatoa1883

Great images, Mark, CaK is super sharp, really.

krakatoa1883

I was forced to give up with CaK for now as bad seeing conditions persists on N Italy, so I made few images in H-alpha of that impressive prom on the W limb and of the spotless bright region that is about to turn on the other side. I have also taken several videos of the prom as I intended to assemb...

krakatoa1883

Just to add my experience with a setup similar to the one described in this old discussion: Baader Cool Ceramic wedge + Baader K-line + Lunt Ca-K module (etalon only) 1 wedge as.jpg the above is a low res image, still to investigate if there is enough light with my scope (115 mm) for taking hires im...

krakatoa1883

A really great work, Stu.

krakatoa1883

A really great work, Stu.

krakatoa1883

wow, great captures! love those fine details inside the flame

krakatoa1883

Hello John, I used of the original BF assembly of my Lunt module. The Barlow is a Takahashi extender, an air-spaced doublet with only 20 mm of free aperture. Given the dramatic improvement I had I am now planning to purchase a larger focal extender, possibly of a telecentric type.

krakatoa1883

May be a mix of coma and astigmatism, more coma perhaps. Today the seeing is horrific however I couldn't resist to make further tests and these are the results: taka betwn bf and eta arrow.jpg while rotating the BF assembly by 90° gives this taka betwn bf and eta 90deg arrow.jpg However placing the ...

krakatoa1883

Unfortunately I could not do anything better with your raws than GreatAttractor already did. However at that image scale I think you need a really excellent seeing to obtain good images. Why don't use a stronger reducer ?

krakatoa1883

Great image, well resolved and well processed

krakatoa1883

Great observing session. I missed everything today, still cloudy here.

krakatoa1883

Nice images, Rusted, and what a beautiful old style observatory!

krakatoa1883

Alfred, can you share the raw ?

krakatoa1883

Thanks, Alexandra, very interesting. I am planning to remove both BF filter to find a better tilting position as I think the problem is that.

krakatoa1883

Great H alpha, lot of resolved details!

krakatoa1883 · Re: Full disk 21-05-2020 Great discs, Rainer.

Great discs, Rainer.

krakatoa1883

Nice images, Frank!

krakatoa1883

Thanks Mark for the advice. Sky today is very hazy however I made a couple of video just to show the kind of problem I am facing with the BF. This below is an image with K-line + B-CCD in front of the etalon k crop.jpg and this is with the original Lunt BF assembly bf crop.jpg The latter seems to ha...

krakatoa1883

Thanks for comments and for useful info about a candidate BF for my Lunt etalon. Yes, 10nm FWHM seems too wide for an effective BF, however the K-line which is around 8nm gives only a slightly lower contrast compared to the original Lunt so may be that something around few nm could be enough as one ...

krakatoa1883

Great H-alpha detail, may be a little too dark, may I suggest a brighter version ?

krakatoa1883

dmund Optics has a 393nm/10nmFWHM filter with very good transmission in CaK that I am using in combination with a blue CCD filter and a KG-3 IR blocker. thanks for your suggestion. I have found a 394 nm, suppose is the same ? https://www.edmundoptics.eu/f/hard-coated-od-4-10nm-bandpass-filters/1383...

krakatoa1883

Great image with lot of contrast. Is the scope a f/10 achromat ?

krakatoa1883

Thanks for your comments!

krakatoa1883

Fine images, well processed. Is the disc flipped N-S ?

krakatoa1883

Great disc with superb detail

krakatoa1883

Detailed captures! For me 2x is the most balanced.

krakatoa1883

The Sun shows today some fine details although that bright region close to the NE limb developed only two minor pores, at least for now. I started taking the usual CaK disc with the Lunt module 2020-05-20-0948-RB-Cak-fulldisc Lunt.jpg then I removed the 2" blocking filter nose (very awkward) an...

krakatoa1883

Spectacular images, Stu, great work! Happy your Tecnosky scope is performing so well.

krakatoa1883

Fine images, Pedro. A bright region is developing on the E limb, close to the equator.

krakatoa1883

Great discs, Eric, as usual. Beautiful prominences, well captured!

krakatoa1883

Fine discs, Rainer, nice to see how many details are now visible in H-alpha compared to few months ago.

krakatoa1883

Great images, Jochen, sharp and well processed.

Where did you place the Baader blue filter ?

krakatoa1883

Many thanks to you all!

krakatoa1883

There are many details in these images in spite of the conditions, fine work!

krakatoa1883

Really great animation, worth of every second you spent in doing it

krakatoa1883

Happy to see some 25th cycle solar activity although with still no sunspots. In spite of heavy veils that persisted all day, I have been able to image those two bright regions that just emerged from the east limb. Inspired by this topic I separated my Ca-K module and I put my Takahashi focal extende...

krakatoa1883

Great discs, Pedro, fine images indeed!

krakatoa1883

Really great captures, good work!

krakatoa1883

Very portable and effective setup, nice animation!

krakatoa1883

Nice results, Brian, sometimes I am also forced to use of the 2x2 binning to obtain some decent image.

krakatoa1883

These are really awesome, Stu, very good work, seeing must have been really steady if allowed you to use the 5x Powermate.

krakatoa1883

I agree in principle, Mark, however I could not detect any sweet spot with my calcium devices used with ordinary barlows, may be because the sensor area is small compared to the FOV one uses for observing visually in H-alpha. Daystar, for example, doesn't recommend barlows nor telecentrics for calci...

krakatoa1883

christian viladrich wrote: ↑Mon May 11, 2020 7:35 pmI've made some calculation of the effective FWHM for my 0.24 nm Ca K filter depending on the f-ratio :

does it make any difference using a telecentric lens compared to an ordinary diverging amplifier ? (as it does for H alpha). Lunt CaK modules come with no recommendations in this respect.

krakatoa1883

Always enjoy your CaK images, Stu, well resolved and well processed

krakatoa1883

Great images with lot of contrast and beautiful processing!

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