Excellent work, Pedro, very sharp discs.

Fine images, Nigella, CaK proms have been captured really well!

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.

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 screwed on the standard nose of my...

I am really impressed by your Ca-K images, Mark, a very good result It have the impression, however, that those taken through your TAL are more sharp than these.

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 ...

Very good images with much details in the spicule carpet, my Quark Chromo is not so good. Is the interference eliminator needed with the 174 ?

Fantastic, Paul, great work!

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 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 devel...

Fantastic CaK, Mark, the spicule layer and the proms are really impressive, do you process them separately from the disc ?

Great discs, Stu, well captured filament.

Agree, want to remove it because is mounted in a barrel slightly larger than 2" that can't be inserted in the 2" focuser of the receiving scope and therefore requires an extension, this put the etalon in the wrong position. If I remove the barrel I can solve the problem.

Thank you very much for your answers, my concern was about not to damage the etalon.

I am looking for the transmission characteristics of the red glass which is in front of the etalon assembly of my Lunt 50 pressure tuning module but I couldn't find anything, I suppose it is an internal ERF or something like that. I wonder if I can use the PT module without this red glass when there...

Thanks. That's an excellent image Raf, almost has a double stack look to it. The behaviour of my PT is very erratic, sometimes is disappointing sometimes is similar to having a DS. Surely it is temperature-dependent and I noted also that between the original B600 and the the B1200 I purchased later ...

Great images, Stu. Side reflections are an annoying problem with most filters, better to leave them, however, than sacrifice the detail.

Great discs, very sharp indeed!

Thanks for your kind comments

Thanks for your detailed observing notes, James, what a lovely iPhone capture!

Great images, Nigella, lovely colour!

Great animation, banjo!

Still no spots today, and few faculae only. Looking through my Lunt 50 I noted a dark filament close to the NE limb so I decided to take a closer view. This time I used a Celestron XLT 100ED scope modified with the Lunt PT module, seeing was only slightly less than awful nevertheless it was worth of...

EGRAY_OBSERVATORY wrote: ↑Wed Apr 07, 2021 10:45 amwhat does cold/mild/warm weather really mean ??

In my location at 45°N and 120m a.s.l. "cold" means 5°C or lower, I actually avoid using the scope when air is close to 0°C, I prefer to use a Quark wrapped in a dew heater instead.

Great images, Mark. Which scope,TAL or Bresser ?

In cold weather the o-rings shrink and become stiff therefore the PT system becomes less efficient, the BF also doesn't work properly. I always see this happening on my Lunt scope which performs best in mild and warm weather.