I normally use a Baader CC with my 150 mm f/5 refractor without problems. Inside the wedge there are ND3.0 + ND06 filters. Someone adds a UV/IR cut before or after the wedge, I am not sure it is necessary.

Fantastic images! Which instrument have you used for the comet ?

As far as contrast and definition are concerned, yes, with an external amplifier my Quark works better than in the original configuration, not a huge difference but is there, in particular if an external or internal ERF is placed in front of the device. Actually this is the reason that lead me to re...

Great images Brian. I see some horizontal lines crossing the discs is WL and CaK... or is it my monitor ?

Very, very beautiful discs Alexandra. I understand that you images are with N up and E left ?

I'm not sure you can unscrew the telecentric on the later batch quarks? the telecentric is mounted in an inner black barrel that can't be removed from the device body without making the Quark unusable, however each lens group can be removed separately leaving the body as it is. The BF shall of cour...

Great images Marty, the group is still there, I counted 14 small spots this morning.

Hi Brian the telecentric is composed by two doublets, the large converging one can be removed by separating the red and the black barrels of the Quark. It is placed in the black barrel and can be easily taken out by unscrewing its retaining ring (NB, opening the Quark will void the warranty). For re...

Great vacation setup and beautiful images!

It's great, Stu, a fantastic opportunity. I don't have particularly good images for contributing but I am sure you'll collect many fine pictures for your presentation from our most skilled forum members. Thanks for sharing with us.

Great captures, Eric. Is that one your average daytime seeing or is it generally better/worse ?

Excellent images, Pedro, thanks for detailing the flat field procedure, very useful.

Thanks to all for your comments, very kind

The group is still there, both the trailing and following spots are slightly larger than yesterday, look at it if you can.

Today first clear and sunny day since October 20th. Of course the seeing is terrible as the atmospheric circulation changed from a humid and cloudy African anticyclone to a dry Russian cyclone together with an abrupt temperature fall. No high resolution possible however I did my best to capture a fu...

You should determine by yourself what is the reducing factor for a given distance from the converging lens to the camera sensor. It's enough to point the scope to a distant object and see how larger becomes the field of view with the reducer. There are actually different reducers available for use w...

Excellent work, Marty. Why don't you insert a focal reducer before the camera ? It would help to obtain a larger view.

Fine prom video, Apollo.

Fantastic proms, Eric!

You CaK setup is a winner, Stu, nice image!

At least you're able to see the Sun, my last image was one month ago, since then always cloudy here

Nice disc, and how many colors around you, a very beautiful nature

In my opinion for hires imaging in the near UV correcting the system for SA is much more important that enlarging the D-L field, thus an all-reflecting system would definitely be much more preferable than modifying a SCT. BTW, one can consider a commercial Cassegrain , it is a relatively inexpensive...

Nice disc, Mark, with lot of details for a solar minimum. The bright zone on the left of the center disc has now evolved in a B-class sunspot group. It is bright in UV and SE of it another bright patch is developing.

Thanks, Mark, graph is very clear. I put my Wolf numbers in a graph too, the overall (N + S) double peak is apparent

I remember that spot, it was actually at even higher latitude (+36°) however as it appeared already close to the W limb the magnetic pattern was unclear, may be the N pole is preceding but I am not sure Thanks Alexandra for the comparison box.

It's raining here (since three weeks...) but browsing SDO images a high latitude spot is present, maybe belonging to the 25th cycle. Has anyone already imaged it ?