Best bet is to keep an eye on fleabay and all the usual 2nd hand haunts for a PST objective, sometimes they come up minus the etalon if it has been used for a mod.

The Maier or beloptik ITF could then be used in conjunction with the blocking filter...

The cloudiness is the rust.

That's a nice moon Stu!

Thanks everyone! I was undersampling Valery, I need to look at a more powerful barlow for CaK, I end up stacking barlows at the moment if I want to get up to >f30 which the extra glass really has an adverse effect on light levels. My 2.5x barlow gives me a annoying ghost at 393nm which rules it out....

Yeah, you have an older PST, the ITF coating is on the objective, that's why it has that cloudy red colour.

ITF coating is on the objective. An older PST?

Weather forecast was for hail and thundery showers for today, however as is with such unstable air streams the day will start off bright and clear before all of a sudden the clouds bubble up with force. I was out setup and observing by 9am. First off I went to the blue end and got some CaK in as I k...

Nice granulation Pepe, the granulation came out well.

Nice results Stu! I managed a few shots before the hail showers set in.

Good image, it's always nice to find some data you thought hadn't got.

Nice moons Pedro!

Looks like you had a productive day with lots of nice images. I think my favourite Ha full disk is the one with the SM60 and the TV101.

An exceptional disk! Congrats on another orbit

I hope when the cell for my double stack etalon finally arrives I can get a DS system like yours. You are spot on band with lots of contrast. Look at the bright points in the polar northern latitudes, that's cycle 25 just below the surface...

An exceptional disk! Congrats on another orbit

I hope when the cell for my double stack etalon finally arrives I can get a DS system like yours. You are spot on band with lots of contrast. Look at the bright points in the polar northern latitudes, that's cycle 25 just below the surface...

A solar newton is a very good idea.

Let us know what they say Alexandra

Are you dealing with FLIR europe i'm guessing? I've been dealing with Clearview Imaging here in the UK and found them very helpful with my PGR questions https://www.clearviewimaging.co.uk/

Welcome Martin!

That's very interesting Valery, good find! I think we'll put this in the solar library in a few days time once it has had some coverage here in the main forum page.

I will give the logarithmic histogram a go thanks Bruce.

Nice new toy!

I don't think the diameter of the 152 fracs dew shield will be much behind that of the 8" scope. Longer screws would work, you could even drill and tap three holes on the dew shield on the frac so the nylon bolts screw securely into place.

Cool! I had wondered about doing something similar myself. BTW I get my adaptor plates made by Telescope service in Germany too.

Very nice Eric! Thanks for the updates, looks like we have an emerging flux region.

Love the photos of the setup Marty

Great images Marty! Pants weather for me today, hoping for some better skies on sunday...