Search found 582 matches

by Bob Yoesle
Wed Oct 28, 2020 1:29 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Advice requested on Quantum filter purchase
Replies: 13
Views: 429

Re: Advice requested on Quantum filter purchase

Recently a friend ordered a double stack filter set from Solarscope and was disappointed that they didn’t match up to his (excellent) Lunt DS. His money was returned immediately - no quibbles. My experience with the SolarScope DSF100 filters was that they were quite temperature sensitive, and could...
by Bob Yoesle
Fri Oct 23, 2020 3:23 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Advice requested on Quantum filter purchase
Replies: 13
Views: 429

Re: Advice requested on Quantum filter purchase

Hi Alexandra, Yikes! That's a horror story worthy of Halloween. The Quantum SE and PE filters do however come with an adhesive label with a serial number. Of course it could be removed and/or replaced... but I just hope they are really busy and I will eventually get a fully functional filter back to...
by Bob Yoesle
Thu Oct 22, 2020 2:45 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Advice requested on Quantum filter purchase
Replies: 13
Views: 429

Re: Advice requested on Quantum filter purchase

I do not want to say anything bad about Daystar but I bought some not long ago, April 2018, a QUARK and a QUANTUM PE 0.4Angström and both were blind. It took me over a Year to solve this problem with Daystar. In this regard the customer service was horrible. I paid that time US $ 13,700.00 for both...
by Bob Yoesle
Sat Sep 19, 2020 12:39 am
Forum: This is SolarChat !!
Topic: Seattle Sun- Smoke filtered sunlight
Replies: 6
Views: 183

Re: Seattle Sun- Smoke filtered sunlight

Smoke filtering.jpg About seven days ago in eastern Washington State. Visibility about 800 meters. Then it got worse, for a few days visibility less than 400 meters, and no sun at all. We've had to wear an N95 mask for the smoke for the limited times we went outside (let alone Covid 19 exposure pre...
by Bob Yoesle
Wed Sep 16, 2020 7:26 am
Forum: Solar Scope Modifications
Topic: Replacing Lunt CaK BF with something better
Replies: 17
Views: 515

Re: Replacing Lunt CaK BF with something better

Hi Ken,

That's similar to what I have. Most all of my imaging to date has been done with a PGR (FLIR) Chameleon with ICX445 CCD @ 3.75 um pixels.

With the ED100/900 this gives me 0.86 arcsec/pixel. When seeing allows, the TeleVue 2x Big Barlow yields ~ 0.43 arcsec/pixel.
by Bob Yoesle
Tue Sep 15, 2020 4:24 pm
Forum: Solar Scope Modifications
Topic: Replacing Lunt CaK BF with something better
Replies: 17
Views: 515

Re: Replacing Lunt CaK BF with something better

Like Mark and others, I find the CaK filter gives better (repeatable) results when used at f10 (or greater)... True, however my scope is well corrected in CaK even at full aperture so I would prefer to maintain resolution if I can. However I'll do some tests to see what gives better results, full a...
by Bob Yoesle
Sat Sep 12, 2020 6:13 pm
Forum: This is SolarChat !!
Topic: Older Halpha diagonal tuner
Replies: 3
Views: 130

Re: Older Halpha diagonal tuner

The tilt-tuned blocking filters were from the Isle of Man Coronado days. The model you're referring to is the Prom 15 T:

Prom 15T side.jpg
Prom 15T side.jpg (129.96 KiB) Viewed 113 times
Prom 15T back.jpg
Prom 15T back.jpg (90.18 KiB) Viewed 113 times

The was also the tilting BF30:

IOM BF30.jpg
IOM BF30.jpg (197.64 KiB) Viewed 113 times
by Bob Yoesle
Fri Sep 11, 2020 7:38 pm
Forum: This is SolarChat !!
Topic: NASA, NOAA to Discuss Solar Cycle Prediction During Media Teleconference
Replies: 4
Views: 159

Re: NASA, NOAA to Discuss Solar Cycle Prediction During Media Teleconference

Thanks for the information Frank. I note that Dr. Upton is on the panel, and she collaborates with Dr. Hathaway who recently retired from NASA. Their predictions can be found here:

http://solarcyclescience.com/forecasts.html
by Bob Yoesle
Thu Sep 10, 2020 7:25 pm
Forum: This is SolarChat !!
Topic: How much pressure is in a pressure tuned etalon? And more
Replies: 16
Views: 336

Re: How much pressure is in a pressure tuned etalon? And more

You could also make a second fine pressure tuner along the same principles but with a much smaller internal bore and a long throw (thread) to make it easy to adjust, use the original tuner to get up to pressure then the second one for getting perfectly on band. Ralston ( https://www.ralstoninst.com...
by Bob Yoesle
Thu Sep 10, 2020 5:30 am
Forum: This is SolarChat !!
Topic: How much pressure is in a pressure tuned etalon? And more
Replies: 16
Views: 336

Re: How much pressure is in a pressure tuned etalon? And more

The LUNT PCUSB Controller: https://luntsolarsystems.com/shop/accessories/lunt-pc-usb-pressure-tuner-controller/ This diagram from LUNT shows what at typical air-pressure tuned etalon does: Etalon pressure tuning.jpg Note that at sea level with no additional pressure the filter is off-band blue, and ...
by Bob Yoesle
Wed Aug 19, 2020 12:30 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: L'observatoire du Soleil. High Resolution Solar Observer
Replies: 7
Views: 438

Re: L'observatoire du Soleil. High Resolution Solar Observer

Hmmm... What sounds good in theory often does not work out well in reality. This is especially true of daytime solar observation versus nighttime observations. I generally don't have enough good daytime seeing to effectively use over ~ 150 x, and usually half that is my sweet spot. The other item is...
by Bob Yoesle
Mon Aug 17, 2020 8:37 pm
Forum: This is SolarChat !!
Topic: CaK and Ha with a T250
Replies: 12
Views: 359

Re: CaK and Ha with a T250

Lovely, especially the CaKs.
by Bob Yoesle
Mon Aug 17, 2020 8:32 pm
Forum: This is SolarChat !!
Topic: My first solar scope (150 F/8 unaluminized reflector)
Replies: 29
Views: 744

Re: My first solar scope (150 F/8 unaluminized reflector)

Wow - that's really a nice history pedro! And speaking of toilet rolls... Your post reminded me of my first home made telescope - also a 6 inch f/8 cardboard tube Newt on a pipe mount. I ground and figured the mirror in the 7th grade (top left, next to my 1962 Christmas present - a 60 mm Unitron ;-)...
by Bob Yoesle
Sun Aug 09, 2020 6:54 pm
Forum: This is SolarChat !!
Topic: Ca K images taken on Aug 7 with the 300 mm Newtonian
Replies: 15
Views: 338

Re: Ca K images taken on Aug 7 with the 300 mm Newtonian

Christian also posted these fantastic images on CN. I replied with some links to articles on faculae and bright points that some may find of interest:

https://www.cloudynights.com/topic/7221 ... ry10404755
by Bob Yoesle
Sun Jul 12, 2020 1:44 am
Forum: Solar Scope Modifications
Topic: Lunt CaK diagonal modded to straight through
Replies: 9
Views: 2927

Re: Lunt CaK diagonal modded to straight through

The larger "nosepiece" filters are ERF's, the smaller filter in the eyepiece holder is the narrow transmission CaK filter. So you would only need one of the "nosepiece filter" assemblies and two of the eyepiece holder filters in order to double stack the Lunt CaK modules. Lots of people have success...
by Bob Yoesle
Sun Jul 12, 2020 12:52 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Can I have an 2020 update on where we are with Ca-K filter controls.
Replies: 44
Views: 2298

Re: Can I have an 2020 update on where we are with Ca-K filter controls.

What's the optical train in your filter Bob? I hear what you're saying about more energy coming through the L1. Hi Mark, I don't have it all worked out as of yet. I'm working with a double-stacked pair of PST CaK filters, and going from there. My primary goals are to 1 - reduce reflections, and 2 -...
by Bob Yoesle
Wed Jul 08, 2020 1:00 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Can I have an 2020 update on where we are with Ca-K filter controls.
Replies: 44
Views: 2298

Re: Can I have an 2020 update on where we are with Ca-K filter controls.

In my home brew CaK module the Badder B CCD filter lets way too much off-band energy trough for my tastes (which seems to be converted to lots of heat), and the Astronomick filter would be worse in that regard. I'm now considering one of these two filters as an CaK module ERF, perhaps combined with ...
by Bob Yoesle
Wed May 27, 2020 12:23 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Solarscope SF70DS incoming
Replies: 65
Views: 3344

Re: Solarscope SF70DS incoming

Hi H Mark,

Thought you might be interested in this thread if you haven't seen it already:

https://www.cloudynights.com/topic/6844 ... pe-sf70ds/
by Bob Yoesle
Tue May 19, 2020 2:36 pm
Forum: This is SolarChat !!
Topic: Given the cost, is double stacking worth it for someone who primarily does electronic imaging?
Replies: 5
Views: 291

Re: Given the cost, is double stacking worth it for someone who primarily does electronic imaging?

Ditto to what Alexandra has stated - with the caveat that if your single stack etalon allows significant background glow, faint prominences might be unaffected, if not even more visible, due to the suppression of this scattered light (i.e. poor transparency). This is especially true with front mount...
by Bob Yoesle
Mon May 18, 2020 1:28 pm
Forum: Solar Reference Library
Topic: Etalon info for beginners
Replies: 12
Views: 856

Re: Etalon info for beginners

You might find this CN thread of interest:

https://www.cloudynights.com/topic/4809 ... on-basics/
by Bob Yoesle
Tue May 12, 2020 4:34 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What do you think is the most versatile high resolution solar telescope design?
Replies: 44
Views: 8828

Re: What do you think is the most versatile high resolution solar telescope design?

So going a ways back in this thread here's the four element ~ 3.5 x UV Barlow corrector designed for the Celestron 9.25 by H. Rutten (yes, that Rutten), and it uses simple plano convex & concave COTS lenses which can be sourced from Edmund or other vendors. It might work well for other SCTs - especi...
by Bob Yoesle
Tue Apr 14, 2020 4:45 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Best camera for solar imaging
Replies: 17
Views: 3789

Re: Best camera for solar imaging

For full-disc double-stacked views, and given you have stated you're "not concerned about the cost," I would recommend you not consider double stacked internal or external/internal set-ups, and go the 'full monty' of double stacked external (objective-mounted) etalons. These will give you overall th...
by Bob Yoesle
Thu Mar 05, 2020 6:26 am
Forum: This is SolarChat !!
Topic: Outreach
Replies: 6
Views: 5570

Re: Outreach

Hi DT6,

I do a lot of outreach in the PNW, feel free to PM me for advice or a gettogether. The only real issue now is the solar minimum and paucity of continuum activity. Otherwise you tailor your outreach to the age/audience.
by Bob Yoesle
Thu Mar 05, 2020 3:31 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: SM2 Etalon, Primary vs Double Stack Module?
Replies: 6
Views: 7982

Re: SM2 Etalon, Primary vs Double Stack Module?

Hi Marty, you can not rely on retail vendor advertising images to reflect the current model production. Many of them show previous generation models for the current version. I would stick to the manufacturers site for the correct image of the filter production - and this is not even 100% reliable.
by Bob Yoesle
Thu Mar 05, 2020 3:27 am
Forum: Solar Scope Modifications
Topic: Optimum BF for 6" f/10 with PST etalon and ASI174?
Replies: 35
Views: 13847

Re: Optimum BF for 6" f/10 with PST etalon and ASI174?

Unfortunately, Christians' experience with Omega filters is also my experience. FYI - Not all blocking filters are 0.6 nm - it depends on the etalon and blocking filter generation. Some of the early Coronado BFs were closer to 0.2-0.3 nm, and the etalons themselves had a narrower FSR. Using a Lunt B...