Search found 2690 matches

by Valery
Sat Apr 21, 2018 11:18 am
Forum: This is SolarChat !!
Topic: AR12706 High Res in H-a 280mm SCT + ARIES DERF
Replies: 1
Views: 35

AR12706 High Res in H-a 280mm SCT + ARIES DERF

Hi all, Today was a clear transparent sky with a moderate seeing condition. Here is the best image out of dozen I have recorded and processed. 280mm F/10 SCT has been used with the ARIES 295mm full aperture two bands filter. The AR12706 was moderately active during these recordings. Several small mi...
by Valery
Fri Apr 20, 2018 12:32 pm
Forum: This is SolarChat !!
Topic: AR2706 in CaK
Replies: 3
Views: 57

Re: AR2706 in CaK

Nice images!
by Valery
Fri Apr 20, 2018 8:43 am
Forum: This is SolarChat !!
Topic: Results with large aperture ERF
Replies: 5
Views: 119

Re: Results with large aperture ERF

Hi Stu, Congratulations with the first light. Your first results are significantly better than were my first light results using largr aperture scope. Some suggestions if I may. 1. If the camera frame size is a limiting factor for the recording speed, use smaller ROI without any hasitation. I usuall...
by Valery
Wed Apr 18, 2018 6:22 am
Forum: This is SolarChat !!
Topic: 17Apr18 - ARIES D-ERF on C8 + PST Etalon Images
Replies: 9
Views: 178

Re: 17Apr18 - ARIES D-ERF on C8 + PST Etalon Images

The best F/D (on the camera chip) for IMX174 is about F/18-22. No necessity to go slower - you will not win in the detalization and sure will loss in ability to do a high resolution imaging with short exposures.
by Valery
Wed Apr 18, 2018 6:14 am
Forum: This is SolarChat !!
Topic: Alfred Tan's PST etalon tests with SW150mm scope
Replies: 13
Views: 284

Re: Alfred Tan's PST etalon tests with SW150mm scope

The gap between an excellent single stack etalon and the double stack isn't that big. But I bet the difference in exposure time is! Yes, this difference looks much less in such active areas and for big apertures it is almost worthless to use a DS for the imaging of such active and full of dramatism...
by Valery
Wed Apr 18, 2018 2:01 am
Forum: This is SolarChat !!
Topic: Alfred Tan's PST etalon tests with SW150mm scope
Replies: 13
Views: 284

Re: Alfred Tan's PST etalon tests with SW150mm scope

Here are two images taken with PST etalon in a single stack (SS) and a double stack (DS) configurations. Both on a 150mm telescope and in a collimated beam configuration. The collimated configuration (with PST native optics) gives the most narrow bandwidth and highest contrast.
by Valery
Wed Apr 18, 2018 12:55 am
Forum: This is SolarChat !!
Topic: Alfred Tan's PST etalon tests with SW150mm scope
Replies: 13
Views: 284

Re: Alfred Tan's PST etalon tests with SW150mm scope

You're lucky to be able to test so many etalons Valery - 30+ PST etalons would cost £15k second hand here. Even more new price... Mark, I didn't test all these 30+ etalons right here at my home in my own telescope! But most were sent to me prior to be sold here in Ukraine after purchase from the As...
by Valery
Tue Apr 17, 2018 5:07 am
Forum: This is SolarChat !!
Topic: Alfred Tan's PST etalon tests with SW150mm scope
Replies: 13
Views: 284

Re: Alfred Tan's PST etalon tests with SW150mm scope

So while it would be costly to get the DERF & blocking filter, it would simply take a lot of time to get a good etalon... Very best, Marty, It should be understandable that an ultimate system always require additional money/time and very often a luck. But the results are well worth of these additio...
by Valery
Mon Apr 16, 2018 10:05 pm
Forum: This is SolarChat !!
Topic: Alfred Tan's PST etalon tests with SW150mm scope
Replies: 13
Views: 284

Re: Alfred Tan's PST etalon tests with SW150mm scope

Really great, I can't imagine going through so many PST etalons! :P Very best, Several years ago, when I have heard that Jean Pierre Brahic has bought a Quark Chromosphere, I have asked him if he is willing to part with his PST etalon. He told me "No". He also told me that all the PST he saw were a...
by Valery
Mon Apr 16, 2018 8:52 pm
Forum: This is SolarChat !!
Topic: Alfred Tan's PST etalon tests with SW150mm scope
Replies: 13
Views: 284

Alfred Tan's PST etalon tests with SW150mm scope

Hi all Here are the results of the PST etalon tests. This etalon was selected during last two years of extensive selecting among more than 30pc of earlier PST telescopes. This is the second best I was able to find and it is 100% same narrow and same luminous (very good fidelity) as my own PST etalon...
by Valery
Mon Apr 16, 2018 12:20 am
Forum: This is SolarChat !!
Topic: Various test results of popular telescopes
Replies: 11
Views: 261

Re: Various test results of popular telescopes

Merlin66 wrote:
Sun Apr 15, 2018 10:35 pm
http://fidgor.narod.ru/Observers/test.html

A bit of an eye opener!!

I'm pleased to see the SW ED80 comes out well.
ED80 are not all equal. As well any other mass production telescopes.
by Valery
Fri Apr 13, 2018 12:13 pm
Forum: This is SolarChat !!
Topic: Whats going in the quiet Sun chromosphere seen through 280mm aperture.
Replies: 8
Views: 280

Re: Whats going in the quiet Sun chromosphere seen through 280mm aperture.

Nice, Valery. Mini-activity offers a lot more areas to capture if you have the resolution. Yes, Dave, this is absolutely true. With telescopes 150mm and larger I always see a lot of short living features like small black filaments (these are small eruptive prominences) which change quickly and quic...
by Valery
Thu Apr 12, 2018 12:07 am
Forum: This is SolarChat !!
Topic: Nice little prom today 4/11/18
Replies: 8
Views: 107

Re: Nice little prom today 4/11/18

I haven't done this in months because the Sun has been so quiet. Just had a quick session when I saw this modest prominence today. 2280mm FL, Basler Ace through LS80 DS2 and 160mm refractor Sun_111435_g4_ap551.jpg Nice capture, Dave! Good details in this prominence. BTW Does it mean you do use the ...
by Valery
Wed Apr 11, 2018 3:45 am
Forum: This is SolarChat !!
Topic: Sunrise from Downunder
Replies: 14
Views: 183

Re: Sunrise from Downunder

Thanks Derek for your nature images! They are wonderful.

Valery
by Valery
Tue Apr 10, 2018 5:49 pm
Forum: This is SolarChat !!
Topic: Lunt LS230???
Replies: 11
Views: 378

Re: Lunt LS230???

Thanks Bruce .Very good point Valery we have a 150mm DS Lunt for sale here in Australia but as I already have a 150 mod I think my money may well be better spent modifying my 10” SCT? Hi Derek, For these kind of money I can easily modify your 10" or 11" SCT as well as the PST etalon and you will be...
by Valery
Tue Apr 10, 2018 3:32 am
Forum: This is SolarChat !!
Topic: A small active area in CaK on the 9th April
Replies: 12
Views: 208

Re: A small active area in CaK on the 9th April

Very nice animations! Thanks for sharing them with us.

BTW The pulsations, I am sure, are the mexture of the seeing and real changes on the sun.
by Valery
Mon Apr 09, 2018 5:46 pm
Forum: This is SolarChat !!
Topic: Whats going in the quiet Sun chromosphere seen through 280mm aperture.
Replies: 8
Views: 280

Whats going in the quiet Sun chromosphere seen through 280mm aperture.

Hi all,

The Sun is very quiet now but what can be seen in it's schormosphere through a larger aperture?

A lot of mini-activity can be seen!

This photo gives you an idear what can be imaged with a 280mm aperture.

Thanks for looking.


Valery
by Valery
Sun Apr 08, 2018 5:44 pm
Forum: This is SolarChat !!
Topic: Lunt LS230???
Replies: 11
Views: 378

Re: Lunt LS230???

If you have the money that much, we can make a good deal with, say, 12" telescope equipped with very nice filtering system and it will be short, compact and not require a large mount. This is the image of a very small sun spot group taken with 280mm telescope (total cost less than 1/3 of the Lunt 23...
by Valery
Sun Apr 08, 2018 2:36 pm
Forum: Solar Scope Modifications
Topic: Maier ITF - first failure?!
Replies: 12
Views: 345

Re: Maier ITF - first failure?!

Merlin66 wrote:
Tue Apr 03, 2018 10:29 pm
Gus,
I don't believe there are any safety issues using the Baader 35nm filter as an ITF.
I use the the "big brother" D-ERF version on my PST Mod.......
According to my experience the KG3 is essential. 35nm Baader alone as an ITF is not enough.
by Valery
Sun Apr 08, 2018 3:44 am
Forum: This is SolarChat !!
Topic: 6Apr - ARIES 214mm D-ERF + C8 + PST etalon testing
Replies: 18
Views: 363

Re: 6Apr - ARIES 214mm D-ERF + C8 + PST etalon testing

Whoooo You're very lucky to be able to test so many PST etalons! In my experience over the past ten years, the PST etalon has a 10/80/10 quality distribution. 10% should never have left the factory 80% are, well, "OK" and do the job - just! 10% are excellent and give tremendous potential for mods. ...
by Valery
Sun Apr 08, 2018 2:19 am
Forum: This is SolarChat !!
Topic: Multiband DERF in action. Ca-K vs H-a
Replies: 16
Views: 455

Re: Multiband DERF in action. Ca-K vs H-a

OMG Valery :o . Incredible high resolution images! Definitly I need a C11 with na Aires filter :roll: Ronnie Thanks, Ronnie Yes, a larger aperture makes a difefrence. C11 with an appropriate DERF is a killer solar scope. Note, that you can also jump at even larger aperture - 312mm DERF filter (for ...
by Valery
Sat Apr 07, 2018 4:15 pm
Forum: This is SolarChat !!
Topic: Sol from the 4th and 5th of April 2018.
Replies: 8
Views: 147

Re: Sol from the 4th and 5th of April 2018.

Hi Eric,

Very nice set of images! As always. Looking for your start with high res imaging this season.


Valery
by Valery
Sat Apr 07, 2018 4:11 pm
Forum: This is SolarChat !!
Topic: Sol 5-4-2018
Replies: 8
Views: 149

Re: Sol 5-4-2018

I like all these DS images. The sun is quiet, but still something to see and to image.

Valery
by Valery
Sat Apr 07, 2018 4:07 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20180407) | SM90II first light
Replies: 15
Views: 330

Re: Today's SUN (20180407) | SM90II first light

Finally a few images with the LUNT152 + CORONADO SM90II It seems that this etalon works better with high focal ratios (F/10) Hi Pedro, A front mounted etalon works equally with different F/D of a scope. If you see the improvement - this is because the blocking filter works better in a slower F/D co...
by Valery
Thu Apr 05, 2018 7:39 pm
Forum: This is SolarChat !!
Topic: G-Band and H-Alpha Images from Singapore (New images added)
Replies: 32
Views: 608

Re: G-Band and H-Alpha Images from Singapore

Hi Alfred,

Great images with the C8 at the G-band ! These ones are among the best I ever saw with 8" telescopes.

Wish you more great seeing weather.


Valery