Search found 3045 matches

by Valery
Sat Nov 17, 2018 9:41 pm
Forum: This is SolarChat !!
Topic: Still orbiting around the Sun....
Replies: 6
Views: 114

Re: Still orbiting around the Sun....

Nice session, Raf. This is in any case better than nothing (at most places in Europe).

Thanks for sharing.


Valery
by Valery
Fri Nov 16, 2018 2:16 am
Forum: Solar Scope Modifications
Topic: Where to go from here to maximize results (Histogram, etc.).
Replies: 16
Views: 339

Re: Where to go from here to maximize results (Histogram, etc.).

Hi Jack, I would advice the following imaging train. ARIES DERF - 6" refractor - 1,25x - PST Mod1 - Barlow lens - camera. For 5.86m pixel camera chip you need about F/20 - F/28 if the pixel size is smaller, you need a proportionally smaller F/D. For prominences use smaller F/D - depends of how brigh...
by Valery
Fri Nov 16, 2018 1:55 am
Forum: This is SolarChat !!
Topic: Sol from the 11th of November 2018.
Replies: 8
Views: 160

Re: Sol from the 11th of November 2018.

I am envy you, Eric. You have a nice winter - with a lot of sun.
Your FD images always impress me. These images are not exceptions.


Valery
by Valery
Thu Nov 15, 2018 1:34 pm
Forum: This is SolarChat !!
Topic: Sunspot 2726, Big Prom, Full Disc | 150mm & 40mm HA | Nov 13th 2018
Replies: 14
Views: 252

Re: Sunspot 2726, Big Prom, Full Disc | 150mm & 40mm HA | Nov 13th 2018

Could you link what sort of shorter barrel being referred to? I'd like to try it out. F21, F25 would be great! Very best, These shorter barrels are custom made (by a local machinist) with the same threads as the original abbrrel but with shorter bodies. The barrel has at it's front side the thread ...
by Valery
Thu Nov 15, 2018 4:54 am
Forum: This is SolarChat !!
Topic: Sunspot 2726, Big Prom, Full Disc | 150mm & 40mm HA | Nov 13th 2018
Replies: 14
Views: 252

Re: Sunspot 2726, Big Prom, Full Disc | 150mm & 40mm HA | Nov 13th 2018

Thanks all, Why don't you insert a focal reducer before the camera ? It would help to obtain a larger view. I do sometimes, especially when seeing doesn't support the large scale. These are ~F35 (F8.3 scope with 4.2x telecentric in the Quark) and the seeing supported it, so I just ran with it. It's...
by Valery
Tue Nov 13, 2018 6:13 pm
Forum: Solar Scope Modifications
Topic: Lunt CaK B1200 + PST #1 yellow
Replies: 9
Views: 399

Re: Lunt CaK B1200 + PST #1 yellow

do not sell it for too cheap, these things are worth no less than your b1200 filter; and the demand for them is insane. keep in mind it is much larger than the b1200, and supposedly has narrower bandpass. I ask no less than $700 for mine. That is more than fair for how rare these are. people are sa...
by Valery
Sun Nov 11, 2018 8:11 am
Forum: This is SolarChat !!
Topic: High latitude sunspot
Replies: 17
Views: 437

Re: High latitude sunspot

It's definitely a cycle 25 spot. Take a look at the graph from Belgium, it's starting to uptick quite quickly once we get into the new year. wolfjmms.png Thanks Mark, for your note. It makes us optimistic - we will see more sun spots and active areas soon, may be for a next warm season in the nothe...
by Valery
Sun Nov 11, 2018 7:32 am
Forum: This is SolarChat !!
Topic: Mg II in UltraViolet
Replies: 43
Views: 1134

Re: Mg II in UltraViolet

Jp Brahic's scope seems to be the route to take :) You could easily move the corrector plate if you convert the SCT into a truss ( i guess that would make it an R/C scope because you could fix the primary. If this corrector plate hacking solution is viable to get .95 strehl at 393nm I would immedia...
by Valery
Sat Nov 10, 2018 9:52 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: DayStar T scanner TS-1??
Replies: 11
Views: 415

Re: DayStar T scanner TS-1??

mdwmark wrote:
Thu Nov 08, 2018 7:57 am
Well I know of a few that are used. I converted them to a TEC controlled ovens so they will work all year long.
Mark
What is the cost of such an upgrade?
by Valery
Thu Nov 08, 2018 9:22 am
Forum: This is SolarChat !!
Topic: Mg II in UltraViolet
Replies: 43
Views: 1134

Re: Mg II in UltraViolet

TheSkyBurner wrote:
Thu Nov 08, 2018 6:40 am
Would anybody say that this guy, Harald Paleske wasted his money? ?
His achievements were high at that time. Now he is working about solar 12" refractor.
by Valery
Wed Nov 07, 2018 6:32 pm
Forum: This is SolarChat !!
Topic: November 4th Session
Replies: 14
Views: 297

Re: November 4th Session

Hi Brian, A very nice set of images at such a boring sun face! Brian you are always so systematic in your coverage of the disc and various features, these are always beautifully presented and explained. When I go out imaging I have a sort of mad panic dash at anything I can see in a random order and...
by Valery
Wed Nov 07, 2018 6:20 pm
Forum: This is SolarChat !!
Topic: AR12715 in the Ca II K line. C11 280mm telescope.
Replies: 7
Views: 195

AR12715 in the Ca II K line. C11 280mm telescope.

Hi all, Here is the image from my large archive of our sun images. A fairly active AR12715 group as it was early morning of June 21 2018. I imaged it with my C11 280mm SCT equipped with the ARIES 295mm two bands DERF filter and PST CaK etalon. Camera was Balser 1920-155. Seeing was average with some...
by Valery
Wed Nov 07, 2018 6:12 pm
Forum: This is SolarChat !!
Topic: Mg II in UltraViolet
Replies: 43
Views: 1134

Re: Mg II in UltraViolet

Hi Bob,

Here is the CaK image of the sun active area #12715 taken with 11" SCT. So, I see no problems at all for for a C8. And you can get a DERF filter soon after the order.


Valery
by Valery
Wed Nov 07, 2018 5:19 am
Forum: This is SolarChat !!
Topic: Mg II in UltraViolet
Replies: 43
Views: 1134

Re: Mg II in UltraViolet

'Off the Shelf' UV achromats aren't ideal, but could form a starting point for such a scope. You could make a tiny full disk instrument; the 50/200 https://www.edmundoptics.eu/f/near-uv-nuv-achromatic-lenses/13900/ could replace the objective in a finder scope, and then mount the filters on the nos...
by Valery
Tue Nov 06, 2018 4:07 pm
Forum: This is SolarChat !!
Topic: Mg II in UltraViolet
Replies: 43
Views: 1134

Re: Mg II in UltraViolet

marktownley wrote:
Sat Nov 03, 2018 4:55 pm
What is the QE of our cameras at these wavelengths?
I don't know. But possibly high enough. All in all UV is much more powerful than IR radiation.

But they may be expensive.


Valery
by Valery
Sun Nov 04, 2018 6:56 pm
Forum: This is SolarChat !!
Topic: In a reflected sunlight.
Replies: 9
Views: 242

In a reflected sunlight.

My favorite region on our old good moon through my trusty C14 with 0.99 Strehl optics and good (but not very good) seeing.

To see full size, right click and open the image in a separate window.

Valery
by Valery
Sat Nov 03, 2018 10:00 am
Forum: Solar Scope Modifications
Topic: Any interest in this part? LS50C modkit
Replies: 54
Views: 1275

Re: Any interest in this part? LS50C modkit

Apollo, You didn't read my post with enough attention. I told exactly the following: without a special selection one can't WARRANT that the system will work fine. If only the etalon you do plan to use in such a configuration has a bit more than absolute minimal CWL shift to the red wing, then it wil...
by Valery
Fri Nov 02, 2018 5:02 pm
Forum: Solar Scope Modifications
Topic: Any interest in this part? LS50C modkit
Replies: 54
Views: 1275

Re: Any interest in this part? LS50C modkit

marktownley wrote:
Fri Nov 02, 2018 1:41 pm
A TZ3 is on my shopping list too...
What the etalon you will use with this TZ3 ?
by Valery
Fri Nov 02, 2018 4:55 pm
Forum: This is SolarChat !!
Topic: Mg II in UltraViolet
Replies: 43
Views: 1134

Re: Mg II in UltraViolet

marktownley wrote:
Fri Nov 02, 2018 1:46 pm
How feasible is it as a filter?
We need professional opinion(s).
by Valery
Fri Nov 02, 2018 10:58 am
Forum: Solar Scope Modifications
Topic: Any interest in this part? LS50C modkit
Replies: 54
Views: 1275

Re: Any interest in this part? LS50C modkit

Collimated beam scheme with LS50FHa. I would not reccommend to other peoples to go this way unless they have a fun in the experimenting, efforts, time and money wasting. All these Lunt etalons are so inconsistent in it's native CWL, bandwidth, finesse and places where peoples use them are so differe...
by Valery
Thu Nov 01, 2018 4:53 pm
Forum: This is SolarChat !!
Topic: Sol from the 31st of October 2018.
Replies: 10
Views: 211

Re: Sol from the 31st of October 2018.

Hi Eric,

Nice to see your FD images. They always are excellent.

Too bad you was not able to please us with images taken with a 10" Mak.


Valery
by Valery
Thu Nov 01, 2018 11:13 am
Forum: This is SolarChat !!
Topic: Mg II in UltraViolet
Replies: 43
Views: 1134

Re: Mg II in UltraViolet

Note, folks, that even with large(!) CWL shift the picture remains VERY different to what can be seen in a continuum and this makes me optimistic that even 1A two cavity filter will deliver unusual picture full of quite different details. The only problem is do we have such a UV sensitive CCD or CMO...
by Valery
Thu Nov 01, 2018 11:06 am
Forum: Solar Scope Modifications
Topic: Any interest in this part? LS50C modkit
Replies: 54
Views: 1275

Re: Any interest in this part? LS50C modkit

I have experimented with these etalons (LS50FHa and LS35FHa). They worked in a _collimated beam_ scheme, not in a telecentric. The images Apollo reproduced were taken with LS35 worked in a collimated beam. My results with these etalons worked with Baader TZ3 and TZ4 were rather negative, significan...
by Valery
Wed Oct 31, 2018 10:03 am
Forum: Solar Scope Modifications
Topic: Any interest in this part? LS50C modkit
Replies: 54
Views: 1275

Re: Any interest in this part? LS50C modkit

I have experimented with these etalons (LS50FHa and LS35FHa). They worked in a _collimated beam_ scheme, not in a telecentric. The images Apollo reproduced were taken with LS35 worked in a collimated beam. My results with these etalons worked with Baader TZ3 and TZ4 were rather negative, significant...
by Valery
Wed Oct 31, 2018 4:30 am
Forum: This is SolarChat !!
Topic: Mg II in UltraViolet
Replies: 43
Views: 1134

Mg II in UltraViolet

See what can be imaged in near UV light at Mg II line.

https://www.aanda.org/articles/aa/pdf/2 ... 358-15.pdf

And very interesting reading.


Valery