Search found 3229 matches

by Valery
Mon May 20, 2019 4:42 pm
Forum: This is SolarChat !!
Topic: AR12741 Inside it's umbra in Ha
Replies: 6
Views: 101

Re: AR12741 Inside it's umbra in Ha

Montana wrote:
Mon May 20, 2019 9:07 am
Beautiful processing Valery, I never like to see the umbra presented as a black hole

:bow
Alexandra
Thank Alexandra,

Yes, me too. I always inteersted in what an umbra consist in it's guts.


Valery
by Valery
Mon May 20, 2019 4:39 pm
Forum: This is SolarChat !!
Topic: Newly arrived 295mm D-ERF
Replies: 11
Views: 887

Re: Newly arrived 295mm D-ERF

Hello Raymond, Large aperture telescopes need good seeing to realize their advantages in resolution. The common rule is that good seeing much more often can be met early morning, not at hot day time. So, better if you have eastern horizon open for your telescope. Hope this helps and I wish you more ...
by Valery
Mon May 20, 2019 4:27 pm
Forum: This is SolarChat !!
Topic: AR2741 on 14May (New image 22 May)
Replies: 21
Views: 210

Re: AR2741 on 14May

I am still working on improving my post processing technique :) Alfred Alfred, If you do use the same Basler 1920-155 camera as I do, and the same FireCapture software, then always use gamma settings from 180 to 200 when imaging the surface details and 145 to 160 gamma when imaging near limb with i...
by Valery
Mon May 20, 2019 8:08 am
Forum: This is SolarChat !!
Topic: AR2741 on 14May (New image 22 May)
Replies: 21
Views: 210

Re: AR2741 on 14May

Alfred, with less contrast boost the image looks more natural. Excellent!

BTW. Which PST etalon has been used? And what the Barlow lens?


Valery
by Valery
Sat May 18, 2019 7:21 pm
Forum: This is SolarChat !!
Topic: AR12741 Inside it's umbra in Ha
Replies: 6
Views: 101

AR12741 Inside it's umbra in Ha

Here is the umbra and bridge of the AR12741 inner structure as seen in H-a. Telescope used - C11 280mm F/10 SCT equipped with the ARIES 295mm DERF and Quark Chromosphere. May 11, 2019. Right click on the image and choose to open the image in a separate window - to see the image in the full resolutio...
by Valery
Sat May 18, 2019 2:57 pm
Forum: This is SolarChat !!
Topic: AR2741 on 14May (New image 22 May)
Replies: 21
Views: 210

Re: AR2741 on 14May

Very nice series of images, Alfred IMHO, a bit too high contrast. This makes the umbra too dark and some desert areas too bright - a bit less natural than we see on a screen or visually. But these images are really best your images in Ha. I hope that summer will please you will more good seeing days...
by Valery
Fri May 17, 2019 3:46 am
Forum: This is SolarChat !!
Topic: AR12741 at it's full opening in H-a and CaK high resolution with C11 and C8 scopes.
Replies: 7
Views: 158

Re: AR12741 at it's full opening in H-a and CaK high resolution with C11 and C8 scopes.

Astonishing imaging, Valery. Look at the details in the light bridge! You give adaptive optics a run for its money. I can’t believe you were able to stack 3000 / 4000 frames! Were these “real time” quality selected by SSM? Cheers. Peter Thanks, Peter. Yes, there were 3000 frames out of 4000 stacked...
by Valery
Fri May 17, 2019 2:04 am
Forum: This is SolarChat !!
Topic: AR12741 at it's full opening in H-a and CaK high resolution with C11 and C8 scopes.
Replies: 7
Views: 158

AR12741 at it's full opening in H-a and CaK high resolution with C11 and C8 scopes.

Hi all, Early morning May 11 was a nice calm and warm with a light wind from the east. I knew, in a warm season this means - very probably the seeing will cooperate. And it does! Here is the AR12741 in Ha in it's full glory, at full opening near the center of the sun disk. Telescope used is C11 280m...
by Valery
Fri May 17, 2019 12:46 am
Forum: Solar Scope Modifications
Topic: Removing new Mods
Replies: 23
Views: 414

Re: Maksutov 180/1800 Modification?

Mark, I found this thread hazardous, especially for not very experienced users. And what Andy offers is more hazardous than were propaganded by Apollo Lasky here and there. He was banned here and there. I'd offer Andy to experiment with his equipment at his own risk without propaganda here. Valery.
by Valery
Fri May 17, 2019 12:41 am
Forum: Solar Scope Modifications
Topic: Removing new Mods
Replies: 23
Views: 414

Re: Maksutov 180/1800 Modification?

Andy, when will you understand that your math does not reflects the reality? Try to place the edge of the sun in the center of the FOV (imaging - you observe a prominence). Then the secondary baffle will be at fire from the primary mirror, the main baffle will be at the fire too. They are black anod...
by Valery
Wed May 15, 2019 3:13 am
Forum: This is SolarChat !!
Topic: 13 May with Omega Ha
Replies: 7
Views: 126

Re: 13 May with Omega Ha

The only thing is they will have to be tilted to bring them on band and this may cause banding, although a flat should remove that. Pretty much useless flat field in this given case. The problem is not in a different brightness (like vignetting) but also that at brighter area your filter is already...
by Valery
Mon May 13, 2019 6:09 pm
Forum: Solar Reference Library
Topic: Commercially Available Filter Cells For LARGE ERF's
Replies: 19
Views: 494

Re: Commercially Available Filter Cells For LARGE ERF's

Doesn't look like we're any closer then to being able to get the 11" and upwards cells being manufactured... :( If there will be more or less stable flow of orders, I'd gladly make aluminium (cast under pressure) cells with bayonet system like it were done for my C11 and C14. However these are more...
by Valery
Sun May 12, 2019 7:28 pm
Forum: This is SolarChat !!
Topic: May 10: AR2740 / 2741 in H alpha
Replies: 12
Views: 151

Re: May 10: AR2740 / 2741 in H alpha

Nice work, Peter.


BTW. Why not to consider to add an air-spaced etalon to your QUANTUM PE 0,6A? Say, LS50FHa. I belive it will work amazingly well.

BTW2 Do you plan to image this nice AR12741 in a He D3 line?


Valery
by Valery
Sat May 11, 2019 4:10 pm
Forum: Solar Scope Modifications
Topic: Removing new Mods
Replies: 23
Views: 414

Re: Maksutov 180/1800 Modification?

All your math valid for only one single point on the sun disk. But the sun is not a point. The sun heat will hit the collimation lens cell, the wall of the baffle, when you will observe the edge of the sun (proms, spiculaes or AR at the near limb) the sun heat will hit the secondary baffle, the main...
by Valery
Fri May 10, 2019 3:35 am
Forum: This is SolarChat !!
Topic: A late afternoon bonus - 9 May 2019
Replies: 12
Views: 168

Re: A late afternoon bonus - 9 May 2019

He Helen,

A very nice full disk image!


BTW. Can you, please, make images smaller in volume? 300Kb is absolutely enough for such size b/w images. My home internet is raither slow and I tried to load you images several times.


Valery
by Valery
Wed May 08, 2019 6:46 pm
Forum: This is SolarChat !!
Topic: May 7: H alpha and CaK
Replies: 11
Views: 188

Re: May 7: H alpha and CaK

Hi Everyone. Managed some imaging yesterday morning. There was abundant haze (distinct halo around the Sun) but this seemed to have stabilized the air a little. Hydrogen photos were taken with: Aries ERF, Celestron C8 Edge, Moonlite CHL focuser, ~f/46 Telecentric, Daystar QPE 0.6A, ~f/27 FR and ~ f...
by Valery
Wed May 08, 2019 6:42 pm
Forum: This is SolarChat !!
Topic: May 7: H alpha and CaK
Replies: 11
Views: 188

Re: May 7: H alpha and CaK

One question, if I may: You are using the 115mm refractor for CaK, not the C8 - is this for seeing reasons? I am asking because my experience in the last weeks is that even in moments of good seeing, i.e. SSM values of 0.7 and below, my 8inch scope did not really produce better, sharper CaK images ...
by Valery
Wed May 08, 2019 12:26 pm
Forum: Solar Reference Library
Topic: Commercially Available Filter Cells For LARGE ERF's
Replies: 19
Views: 494

Re: Commercially Available Filter Cells For LARGE ERF's

Alfred Tan wrote me this morning that he was able to place an order for his 11" ARIES DERF.

I see I need to star the manufacturing of the cells for filters larger than 10".


Valery
by Valery
Tue May 07, 2019 6:46 pm
Forum: Solar Scope Modifications
Topic: Options for high resolution?
Replies: 18
Views: 505

Re: Options for high resolution?

Thanks, I will give that a try some time. I have a 200mm F6 parabolic quartz mirror on the way to further test with the same D-ERF for shorter wavelength as well that is also quite light weight. I'm interested to see which is easier to work with for this, as both are similar enough to easily mount ...
by Valery
Tue May 07, 2019 4:11 pm
Forum: Solar Scope Modifications
Topic: Options for high resolution?
Replies: 18
Views: 505

Re: Options for high resolution?

Marty, If you will stop down your C8 to 185mm you will get a scope which is DFFRACTION LIMITED at 393nm. It will work same good for imaging (+ deconvolution and sharpening) as it work in Ha. But... it will have 1,5x higher resolution than it has at 656nm at a full 203mm aperture!!! And this equals t...
by Valery
Tue May 07, 2019 6:47 am
Forum: Solar Scope Modifications
Topic: Options for high resolution?
Replies: 18
Views: 505

Re: Options for high resolution?

I do not recommend the C8 Edge, or any SCT, for 393nm specifically. Can it be done? Sure. But frankly, you'll only see limited results. While my evidence is anecdotal, the opposite is true of evidence for it, also quite anecdotal. Images worth of thousands of words. See the results. C11 + ARIES Tri...
by Valery
Mon May 06, 2019 1:01 am
Forum: This is SolarChat !!
Topic: Sol from the 4th of May 2019.
Replies: 8
Views: 91

Re: Sol from the 4th of May 2019.

As always, your fine full disks, Eric!

Thanks for sharing.


Valery
by Valery
Mon May 06, 2019 12:56 am
Forum: This is SolarChat !!
Topic: Evening sunshine 5th May
Replies: 10
Views: 131

Re: Evening sunshine 5th May

Very nice images, Alexandra!

And we all congratulate you with the discovery of the evidence of the cycle 25 beginning.

Valery
by Valery
Sun May 05, 2019 6:06 pm
Forum: Solar Reference Library
Topic: Commercially Available Filter Cells For LARGE ERF's
Replies: 19
Views: 494

Re: Commercially Available Filter Cells For LARGE ERF's

TS has made also a 10" cell for Patrick's Hsieh 10" Meade SCT.

Eric Roel told me that his friend is a mechanist and can make cells up to 11". May be even larger.
Eric also mentioned that his friend is definitely interested if he will have the orders for cells.

Valery
by Valery
Sun May 05, 2019 12:00 pm
Forum: Solar Scope Modifications
Topic: Options for high resolution?
Replies: 18
Views: 505

Re: Options for high resolution?

what about cak, can it be done with an c8 edge hd? or will the internal correctorlens make results worse than with standart c8? anybody doing this succesfully? I doing CaK imaging regularly even with C11 with achieved resolution in 1,7x higher than in Ha with this same telescope. And in the UV cont...