Some extreme details with the AR200/F8.5 - 21.05.

pupak · Post by **pupak** » Tue May 21, 2024 10:23 am

The morning after 8 o'clock is really good seeing and the two hours are worth using. I tried a different combination of etalonss and replaced TV4x with TZ4x and combination B1.6x and TZ4x.
The image is softer but more detailed. It will be a good combination for the AR200.
A few examples are in the attachment. Hope you like them.

rigel123 · Post by **rigel123** » Tue May 21, 2024 10:28 am

These are beautiful Petr, great processing!

Valtori · Post by **Valtori** » Tue May 21, 2024 1:22 pm

Very picturesque images, Petr!!

Val

Post by **Montana** » Tue May 21, 2024 7:42 pm

Wow!! these are absolutely stunning

Alexandra

vineyard · Post by **vineyard** » Tue May 21, 2024 8:02 pm

Jawdroppingly good. In fact no, jawdroppingly great. 2 & 4 are my favourites.

pupak · Post by **pupak** » Tue May 21, 2024 8:12 pm

Thank you all for your positive comments.
Sometimes I wonder if it's not boring for you anymore.

vineyard · Post by **vineyard** » Tue May 21, 2024 8:24 pm

pupak wrote: ↑Tue May 21, 2024 8:12 pm
Sometimes I wonder if it's not boring for you anymore.

No way. That would be like saying that it got boring watching all those ridiculous goals Messi used to score!

DavidP · Post by **DavidP** » Tue May 21, 2024 9:02 pm

These are exceptional even for you Petr.
Amazing detail.
What etalons were used?

ChrisHalpha2017 · Post by **ChrisHalpha2017** » Tue May 21, 2024 9:42 pm

amazing in details and contrast ^^

DeepSolar64 · Post by **DeepSolar64** » Wed May 22, 2024 1:33 am

Petr,
These are very nice. I always enjoy your exquisite close ups!

James

pupak · Post by **pupak** » Wed May 22, 2024 4:45 am

DavidP wrote: ↑Tue May 21, 2024 9:02 pm What etalons were used?

I used a 50mm pressure Lunt from an LS80 and a Quark combo. Lunt does not have collimating lenses. I recently built a 200mm telescope for a friend and used the same combination of etalons. It works better than the tilting LS40.

Martin_S · Post by **Martin_S** » Wed May 22, 2024 5:15 am

Great imaging Petr

Post by **marktownley** » Wed May 22, 2024 5:48 am

Excellent closeups Petr!

Hughsie · Post by **Hughsie** » Wed May 22, 2024 6:45 am

Just beautiful.

I always look forward to your posts and to see what gems you have for us.

Carbon60 · Post by **Carbon60** » Wed May 22, 2024 7:06 am

Absolutely stunning, Petr. Breath-taking details.

Stu.

pupak · Post by **pupak** » Wed May 22, 2024 9:27 am

Thank you all.

It was really two exceptional days when the image on the monitor stood like nails and it was possible to focus well. The temperating of the AR200 is not very long, and when the wind is not strong, the images are very detailed. The Chinese achromat tuned to H-a by the Czech optician does a great job. Unfortunately, my back won't allow me to work with the ISTAR 225 right now. The bent AR200 is still usable for me for now. I will have to say goodbye to ISTAR. Age catches up with everyone.

Valery · Post by **Valery** » Wed May 22, 2024 10:10 am

pupak wrote: ↑Wed May 22, 2024 4:45 am Lunt does not have collimating lenses.

How does it works? No pressure tuning?

pupak · Post by **pupak** » Wed May 22, 2024 10:14 am

The blue tube leads to the electronic pressure regulator. The pressure is controlled remotely.
Etalon naturally has two plane-parallel glasses instead of collimating lenses.

ffellah · Post by **ffellah** » Wed May 22, 2024 10:22 am

You have some amazing closeups here, Petr ! Sharp and beautifully detailed.

Franco

DavidP · Post by **DavidP** » Wed May 22, 2024 6:00 pm

Looking at these again, I just can’t get over the detail within the umbrae.
Can I ask what are the typical exposure times you are using with this setup? Much gain?
Again, thank you for sharing.

KMH · Post by **KMH** » Wed May 22, 2024 6:37 pm

Wow - those are really amazing!

Kevin

pupak · Post by **pupak** » Wed May 22, 2024 6:48 pm

Thank you.

pupak · Post by **pupak** » Wed May 22, 2024 6:56 pm

DavidP wrote: ↑Wed May 22, 2024 6:00 pm Can I ask what are the typical exposure times you are using with this setup? Much gain?

The Quark that was used in this setup has 2x more attenuation in H-a than my other Quark in the LS40 setup, so the exposure length was 15-18ms and the gain around 200. I didn't want to ruin my carefully tuned setup with the LS40 for testing, but next time i will do it because the results could be even better with shorter exposure and lower gain.

pdmphoton · Post by **pdmphoton** » Wed May 22, 2024 8:32 pm

Petr,
One word "Exquisite" !! Just beautiful to look at and get lost in. Never tired of seeing images of this caliber.
Paulm

Oak · Post by **Oak** » Thu May 23, 2024 12:09 am

Very nice work!!

pupak · Post by **pupak** » Thu May 23, 2024 12:28 pm

I won't start a new thread for this. I tried another Quark but the weather was against it. Seeing was an order of magnitude worse than yesterday and even when I got down to half the shutter speed and lower gain, the haze destroyed most of the detail. So just five photos for example.

DeepSolar64 · Post by **DeepSolar64** » Thu May 23, 2024 12:35 pm

It is amazing that you do so well with closeups in poor seeing. I can never pull that off. What is your secret!

James

MAURITS · Post by **MAURITS** » Thu May 23, 2024 12:40 pm

Beautiful close ups Petr.

pupak · Post by **pupak** » Thu May 23, 2024 12:41 pm

I don't know, James, but these photos aren't exactly ideal examples of close-up photography. The basis is good optics with a large aperture, but above all good seeing. If it isn't, no magic will help. A comparison with the images from yesterday clearly proves this.

DeepSolar64 · Post by **DeepSolar64** » Thu May 23, 2024 2:02 pm

Petr,
You still do remarkably well.

James

eroel · Post by **eroel** » Thu May 23, 2024 4:14 pm

Petr:
Superb resolution and beautiful setup.
Best regards and thanks.
Eric.

DanielBrousseau · Post by **DanielBrousseau** » Thu May 23, 2024 8:34 pm

Amazing....should I quit....

Post by **marktownley** » Fri May 24, 2024 5:42 am

Nice additions Petr and always nice to see your scope.

solar · Post by **solar** » Fri May 24, 2024 9:14 am

Exceptional Petr.

Valery · Post by **Valery** » Sat May 25, 2024 1:47 am

pupak wrote: ↑Thu May 23, 2024 12:41 pm I don't know, James, but these photos aren't exactly ideal examples of close-up photography. The basis is good optics with a large aperture, but above all good seeing. If it isn't, no magic will help. A comparison with the images from yesterday clearly proves this.

Peter, nice images! I took a closer look at your images from these two days. And in both cases the resolution limiting factor was not the seeing, but aperture size. Lucky imaging and post processing do a great job to minimize the seeing destructive factor and the limiting factor is diffraction on an aperture. One way or another, earlier or later one will catch a good seeing. But this is not possible with diffraction. Only aperture diameter increasing can help. Refactors or newtonians are not the only telescopes around. A larger SCT with front mounted ERF will easily do the job. If a larger refractors than 200mm are not for you due to age, then C11 with optimized imaging train can do the job with easy.

pupak · Post by **pupak** » Sat May 25, 2024 7:03 am

Thanks for the qualified opinion, Valery, but I have no ambitions to become a professional sun photographer.
It is true that the C11 with full DERF would produce better photos for me about 2 times a year, but if I could handle ISTAR 228, I think it wouldn't be much worse. I make do with what I have and it doesn't bother me at all that someone else takes a better photo. It's my hobby.

arnedanielsen · Post by **arnedanielsen** » Sat May 25, 2024 4:00 pm

Stunning results, Petr!

Valery · Post by **Valery** » Sun May 26, 2024 11:03 pm

pupak wrote: ↑Sat May 25, 2024 7:03 am Thanks for the qualified opinion, Valery, but I have no ambitions to become a professional sun photographer.
It is true that the C11 with full DERF would produce better photos for me about 2 times a year, but if I could handle ISTAR 228, I think it wouldn't be much worse. I make do with what I have and it doesn't bother me at all that someone else takes a better photo. It's my hobby.

Your place allows you to image the sun at a high resolution far more often than 2 times a year. You are the most frequent poster here with high res. pictures with 6" to 10" apertures. And, I believe you can do it even more frequent if to not miss clear mornings. Mild climate, not too hot, not too cold, grassy lowns = a lot of seeing early to mid morning.
C11 is the best telescope in factor telescope per dollar divide on it's weight and length. EQ-6 is enough for this telescope. 9" refractor is far less portable.

pupak · Post by **pupak** » Mon May 27, 2024 5:28 am

I don't know, Valery. I had an 8" Triband and used it twice a year. Long refractors are much more resistant to poor seeing than catadiopric systems. Also, I doubt I could get the money for a 300mm DERF and C11. That's way beyond my limits. Good luck in that a person is satisfied with what he has and does not deal with what he cannot have.

DavidP · Post by **DavidP** » Thu May 30, 2024 4:55 pm

pupak wrote: ↑Mon May 27, 2024 5:28 am Good luck in that a person is satisfied with what he has and does not deal with what he cannot have.

Good luck. And wisdom.
Your words are words to live bye

banjo · Post by **banjo** » Thu May 30, 2024 6:01 pm

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