A tall flame and AR12814

[krakatoa1883]

Today a tall flame prominence is visible on the E limb, those who can shouldn't miss the view

2021-04-14-1026-Halpha-fulldisc proms.jpg (48.69 KiB) Viewed 482 times

AR12814 in the southern hemisphere is growing although it is still of class B, it's more interesting in H-alpha than in visible light. Another small region is developing close to the SE limb and based on STEREO others will follow in the next days.

Thanks for looking!

[ffellah]

There are great, Raf. The close up is beautiful.

Franco

[arnedanielsen]

Great work, Raf.

Best regards,
Arne

[Martin_S]

Nice imaging Raf, the prominence looks interesting.

Martin

[MAURITS]

Beautiful images Raf.

[Radon86]

Hello Raffaello,
Great work, I like these images a lot. Including the 1st one. I never thought about a small scope like a 50mm. I have a similar guidescope, a Altair 60mm guide scope with a F ratio of (225/60)=3.75
I wonder if I could use with a Quark ?

1) Did you upgrade the focuser on your Evoguide 50mm, as I understand it is a helical focuser.

2) Also the ASI178mm, I have not seen that used so much. It has small 2.4 um pixels. Did you focal reduce this to get to critical sampling as of :

http://www.wilmslowastro.com/software/f ... D_Sampling
You would best focal reduce to about F9 with your 50mm scope and 2.4micron pixel size at H-alpha.


Thanks Raffaello,

Magnus

[Montana]

Beautiful and clean images, a pleasure to view

Alexandra

[krakatoa1883]

Thanks for your comments.

) Did you upgrade the focuser on your Evoguide 50mm, as I understand it is a helical focuser.
2) Also the ASI178mm, I have not seen that used so much. It has small 2.4 um pixels. Did you focal reduce this to get to critical sampling as of :

Hi Magnus, you can see the setup in this discussion. The focuser is fine and smooth, I had just to replace the original eyepiece holder with a better one.

I am very happy of the 178 which is fine for full disc and in some instances also for hires. Having very small pixels it requires modest f/ratios and therefore the use of reducers as a 0.7x or 0.5x depending on the setup. For hires imaging a 174 would be a better alternative.

[DeepSolar64]

Very nice! I wish I could figure out how to get full discs with my Coronado SMII 90. Doesn't anyone make an optical element to half the focal length hence the magnification? Barlows/Powermates increase the FL hence doubling it or more.

Nice work on all three!

James

[eroel]

Raf:
A very good session.
Best regards.
Eric.

[Carbon60]

Nice images, Raf.

Stu.

[EGRAY_OBSERVATORY]

FD's are normally captured using a Focal Reducer James.

Checkout the website https://astronomy.tools/calculators/field_of_view/ where it gives options including FR's etc.

Should answer your question - I hope ??

Regards
Terry

[krakatoa1883]

Thanks for comments, much appreciated

I wish I could figure out how to get full discs with my Coronado SMII 90. Doesn't anyone make an optical element to half the focal length hence the magnification?

James, you can make use of a reducer like these below

05x.jpg (30.93 KiB) Viewed 361 times

screwed on the standard nose of my 178MM the left one gives 0.52x the right one 0.35x (although it too is labelled as 0.5x). More expensive (and less aberrated) reducers are available from few suppliers as Baader Planetarium, however for your first tests the above can be fine and are also cheap, which one is best for you depends on focal length and sampling.

[DeepSolar64]

Raf,
I will have to look around for a US dealer that carries these. Thanks. Where did you get these?

James

[krakatoa1883]

Simply go on ebay.com or Amazon and type "eyepiece focal reducer" in the search bar, otherwise you can find them from the usual dealers of eyepieces.

[p_zetner]

Very nice images, Raf.
Cheers.
Peter