Search found 3080 matches

by Valery
Wed Jan 23, 2019 10:16 am
Forum: This is SolarChat !!
Topic: What does 656.281 nm look like?
Replies: 11
Views: 94

Re: What does 656.281 nm look like?

Valery, Good information. I will try a 2.5x Powermate and aperture of 5" for f45. The focal reducer can be relocated to provide a greater reduction. Would it be better to double stack with the Quark Combo? Phil I'd go with PST etalon for DS with Solar Spectrum. PST etalon behavior with tilt change ...
by Valery
Wed Jan 23, 2019 4:58 am
Forum: This is SolarChat !!
Topic: What does 656.281 nm look like?
Replies: 11
Views: 94

Re: What does 656.281 nm look like?

Thanks Valery. That makes sense but will that also broaden the bandwidth? Is this a limitation of this type of telescope in solar imaging? Phil Yes, this broadens the bandwidth. The narrower the bandwidth, the more _relative_ broadening. The faster the F/D, the more broadening. At F/30 your system ...
by Valery
Wed Jan 23, 2019 3:36 am
Forum: This is SolarChat !!
Topic: What does 656.281 nm look like?
Replies: 11
Views: 94

Re: What does 656.281 nm look like?

There is a simple and correct explanation of such event. All etalons are qualified when they work in a parallel beam - the only correct way of test. But in a telescope with telecentric system all rays, except the extreme center, have a tilt. The farther from the center of an aperture, the more the t...
by Valery
Wed Jan 23, 2019 3:20 am
Forum: This is SolarChat !!
Topic: New AR. is it the sign of the new cycle?
Replies: 6
Views: 88

Re: New AR is a sign of a new cycle?

Thanks, Mark for your point of view.
by Valery
Tue Jan 22, 2019 9:07 pm
Forum: This is SolarChat !!
Topic: New AR. is it the sign of the new cycle?
Replies: 6
Views: 88

New AR. is it the sign of the new cycle?

Does anydoby know is the new AR a sign of a new cycle?
by Valery
Tue Jan 22, 2019 9:04 pm
Forum: This is SolarChat !!
Topic: New AR 22nd Jan 2019
Replies: 7
Views: 61

Re: New AR 22nd Jan 2019

Nice image, David.


BTW Please, make smaller your next images. This one is 19Mb and I waited a minute when it loaded.
by Valery
Mon Jan 21, 2019 10:32 am
Forum: This is SolarChat !!
Topic: Sol from the 19th of January 2019.
Replies: 6
Views: 40

Re: Sol from the 19th of January 2019.

Very nice results, Eric!

Valery
by Valery
Sun Jan 20, 2019 2:28 am
Forum: This is SolarChat !!
Topic: LOMO Fabry Perot Interferometer IT51-30
Replies: 2
Views: 71

Re: LOMO Fabry Perot Interferometer IT51-30

Buy the Lunt 50mm LS50FHa and start to experiment without a risk and with high re-sell value.
by Valery
Tue Jan 15, 2019 3:40 am
Forum: This is SolarChat !!
Topic: The most quiet sun I ever saw.
Replies: 5
Views: 94

The most quiet sun I ever saw.

The most quiet sun I ever saw.
by Valery
Mon Jan 14, 2019 2:41 am
Forum: This is SolarChat !!
Topic: Sol from the 12th of January 2019.
Replies: 4
Views: 108

Re: Sol from the 12th of January 2019.

Hi Eric,

Nice images! It is a shame that the sun has such a deep minimum.

Valery
by Valery
Sun Jan 13, 2019 8:15 pm
Forum: This is SolarChat !!
Topic: Quantum 6 setup
Replies: 14
Views: 353

Re: Quantum 6 setup

Thanks for additions, Phil. When you will have enough sunshine, you can do more extended test: 1. Point your telescope at the center of the sun disk 2. take flats for all positions of the Quark tuning knob. 3. the same for SS etalon with 0.1A steps on both sides from center of Ha. This will give you...
by Valery
Thu Jan 10, 2019 2:38 pm
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 82
Views: 1959

Re: PST Etalon with a Quark, Log & Results

The PST etalon is in a telecentric beam so i'm not seeing a sweet spot Valery in my setup (f43 or f32)- sweet spot is only in a collimated light beam. Hah! I thinked that you adviced to use a PST etalon in it's native F/10 - collimation - refocusing mode and then use a Quark with it's telecentric! ...
by Valery
Thu Jan 10, 2019 2:58 am
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 82
Views: 1959

Re: PST Etalon with a Quark, Log & Results

MalVeauX wrote:
Wed Jan 09, 2019 9:11 pm
Thanks Mark, that's a good point about starting with the PST and then the Quark for tuning. I'll try that next session.

Very best,
Due to a small size of a PST sweet spot, this will probably work only for a very narrow FOV.

Valery
by Valery
Tue Jan 08, 2019 11:56 pm
Forum: This is SolarChat !!
Topic: Quantum 6 setup
Replies: 14
Views: 353

Re: Quantum 6 setup

Phil,

How uniform your Solar Spectrums 1.5 0.3A is? What is a typical exposrure time when imaging with it? Same with Quark, please.

Can you share with us typical images in a single stack mode for Quark and for SS etalons? Better in the center of the sun disk.

Valery
by Valery
Mon Jan 07, 2019 3:44 am
Forum: This is SolarChat !!
Topic: January 4th Sun
Replies: 18
Views: 322

Re: January 4th Sun

rapid tuning via pressure is a big plus over the heated etalons I use. Twenty minutes to bring the Solar Spectrum up to temperature and about ten for the Quark. Thanks, Phil Hi Phil, I always use tilt tuning etalon for quick overview of active areas with dark surges and streams. The same with large...
by Valery
Mon Jan 07, 2019 3:37 am
Forum: This is SolarChat !!
Topic: January 4th Sun
Replies: 18
Views: 322

Re: January 4th Sun

Hi Brian,

Nice images. Especially the sequence of different CWL positions. Thanks for sharing.


Valery
by Valery
Wed Jan 02, 2019 7:30 am
Forum: This is SolarChat !!
Topic: New Year Sun
Replies: 15
Views: 236

Re: New Year Sun

Nice images, Alexandra! Thanks for sharing them with us.

BTW Do you have any progress with 11" DERF cell?

BTW2 Yesterday I removed my EQ8 from the dome and it will rests in a warm room till about first decade of March.
Till that I will not see the sun through a telescope. :(

Valery
by Valery
Tue Jan 01, 2019 6:53 pm
Forum: This is SolarChat !!
Topic: 1st Jan Sun in CaK
Replies: 17
Views: 279

Re: 1st Jan Sun in CaK

:hamster: :hamster: :hamster: I bet that made you jump :lol: it always does for me :) Fantastic!! what a great start to the year, maybe that is a good luck omen :) I enjoyed the CaK close ups :bow I really struggled with CaK today as it was so dark, probably all the haze. I finally got some sunshin...
by Valery
Tue Jan 01, 2019 2:45 pm
Forum: This is SolarChat !!
Topic: New Year Sun from Singapore
Replies: 5
Views: 128

Re: New Year Sun from Singapore

Nice to know that somewhere on this planet peoples still see the sun and some activity at it!

Really nice images, Alfred! Thanks for sharing.

And Happy New Year! May this year be a solar activity revival.


Valery
by Valery
Mon Dec 31, 2018 3:50 am
Forum: Solar Scope Modifications
Topic: PST Etalon Adjustment
Replies: 21
Views: 511

Re: PST Etalon Adjustment

Some time ago Mark Townley invented a special plastic gasket which dramatically stabilized the tuing process.
He sent several such gaskets to other chat members. Worked well as far as I remember the feedbacks.

Mark, any chance you can publich the drawing(s) of this gasket?


Valery
by Valery
Mon Dec 31, 2018 3:41 am
Forum: This is SolarChat !!
Topic: December 29th - Ha Sun
Replies: 16
Views: 281

Re: December 29th - Ha Sun

Hi Brian,

Excellent series of images despite seeing. I especially love the image with DS and 3x teleextender.

Thanks for sharing.


Valery
by Valery
Fri Dec 28, 2018 2:08 am
Forum: This is SolarChat !!
Topic: BIG gun (APM180 f/6 Achromat)
Replies: 19
Views: 484

Re: BIG gun (APM180 f/6 Achromat)

Such a fast beast requires special Chromacor which will work at F/6. I got such one - it worked kust fine with my 150mm F/5 scope and it shows either white moon and Jupiter. I never think to sell it before. But now I am getting older and I completely lost interest to night astronomy. Also a 185mm DE...
by Valery
Thu Dec 27, 2018 8:06 pm
Forum: This is SolarChat !!
Topic: BIG gun (APM180 f/6 Achromat)
Replies: 19
Views: 484

Re: BIG gun (APM180 f/6 Achromat)

Nice scope, Pedro! Congratulations. But... it probably need a nice ARIES Chromacor. No?


Valery
by Valery
Tue Dec 25, 2018 4:34 pm
Forum: This is SolarChat !!
Topic: Christmas Eve sunshine
Replies: 17
Views: 348

Re: Christmas Eve sunshine

So nice river (channel) for a pole/whip float fishing!

Merry Christmas to all.


Valery
by Valery
Mon Dec 24, 2018 3:15 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Helium Disk: 08Aug2018 Spectroheliogram
Replies: 14
Views: 602

Re: Helium Disk: 08Aug2018 Spectroheliogram

Montana wrote:
Mon Dec 24, 2018 2:56 pm
Congratulations on an excellent SPOD :hamster:

Alexandra
+100 !!!


Valery