Hi, I'm selling out some equipment. Here, the solar stuff, or usable for solar observation. Prices are without shipment. I'll ship from either Belgium or Germany. Contact: allhoest at scarlet.be CS Alex - Solar Scintallation Monitor SSM V1, original from Airylab 160Eur, which is 50% of current new p...

Hi Bart.
I use to collimate during the day at the location where I travel to.
Can you collimate with the concentrer under daylight?
CS
Alex

It looks promising.
Can you push the system, whilie increasing the resolution, to detect the limit?

CS
Alex

I'm not an expert but I think that uncoated mirrors reflect IR also. At least the lower part of the spectrum.

Some solar edge supplier proposes UV/IR Cut in standard.
Your system for visual use has 5% x 5% transmission.
It should be safe enough with a commercial uv/ ir

CS
Alex

Hi, a few words to press what has been mentioned by others in this post. For ccd use only. Ccd interference filters let IR passing above 1100nm, depending on the maker. Take care for these polarizing filters; they led IR passing through. I would use nd3 with care; baader is offering their ND3 for us...

Very fine pics
CS
Alex

Yes, very much small spots of activity.
Fine!
CS
Alex

These proms are sooo beautiful
CS
Alex

A beauty!
CS
Alex

Very fine.
CS
Alex

I use the Concentrer to prepare the collimation, for centering the secondary. But for finishing the collimation, the Concentrer requires the central spot and dark conditions: http://www.spheretec.de/pdf/Collimating_with_the_Newton_Concenter_Eyepiece.pdf When there is not central spot, then star test...

In a nutshell, after having tested (with Alex and Fred) a number of options since the last 4-5 years, we are unfortunately left with the use of a large ERF for large Ha solar Newtonian. Or a newton with a central hole and treat it like a SC corrector plate, ie by MCM. But like in every treatment, t...

I was off a few days, sorry for not being responsive. After stripping the coating, I checked the mirror temperature vs surrounding. The mirror T°, taken from the side http://www.presencenet.be/nucleus2.0/media/13/20190906-20190821_01_IR_BDZB8728.JPG The bottom cell supporting ring (Wood paint in whi...

Bart, The Astronomik B, that I have, are passing from 385nm. The Baader that I have form an LRGB set is almost passing at about 400nm, so it has a poor transmission at 390..395nm. I would suggest that you get in touch with the supplier and ask for "selected" filters. Astronomik should be responsive ...

The here subject cover the observing with aluminized mirror, thus having high flux suitable for Ha / Cak imaging. Warning: Solar observation is dangerous, we know it. There are solutions for reducing the danger: front filter, Herschell prism, de-aluminized mirror, etc. But solar observation still re...

Thank you for the nice comments.
Despite being made out of nuts and bold, I'm happy with this T300.

CS
Alex.

The purpose of the present operation is to remove the aluminum coating, for use in solar observation. Warning: the following manipulations involve corrosive products. It is your responsibility to take the necessary protective measures. Warning: solar observation can be dangerous if it is not practic...

Here is the last solar image made in St Véran. The wind came from the south, like the days before. Generally a southerly wind is a sign of a difficult observing conditions, with unstable seeing. The best seeing comes with a westerly wind. It had to be an average imaging session and I used a 450nm fi...

Funny :-)
CS
Alex

Thank for the detail about the ATM model.
I have heard that today, etalon maker have problem finding good mica for their filters.
CS
Alex

Fine FD and beautiful prom!
Your PST looks to be a good one also.
CS
Alex.

Interesting results.
Your final focal ratio would then be around 30.
What was your exposure time?

CS
Alex

Very fine proms.
CS
Alex

Beautiful!
CS
Alex

"I also had a Baader IR/UV filter screwed into the nose of the Lacerta."
These polarized filters don't cut the IR, so using a UV/IR is a good idea.

"exposure time down to 122us on a 2.5x Powermate and 1ms on the x5".
Probably the powermate x5 has a factor of x6.5 or f7.

Great shots.

CS
Alex